@anilkumarthakur/match - npm Package Compare versions

Comparing version 0.0.7 to 0.0.8

dist/src/index.d.ts

+import { match } from './match';
+/**
+ * Create a new match expression
+ *
+ * @template TSubject The type of the value being matched
+ * @template TResult The return type of handler functions
+ *
+ * @param {TSubject} subject The value to match against
+ * @returns {Matcher<TSubject, TResult>} A Matcher instance
+ *
+ * @see {@link Matcher} For complete API documentation
+ */
+export { match };
+/**
+ * Core classes and types for the match expression library
+ */
+export { Matcher, UnhandledMatchError } from './Matcher';
+/**
+ * Type for match handler functions
+ *
+ * @template T The return type of the handler
+ *
+ * @example
+ * ```typescript
+ * const handler: Handler<string> = () => 'result'
+ * ```
+ */
+export type { Handler, MatchChain, MatcherHandler } from './types/main';
+//# sourceMappingURL=index.d.ts.map

dist/src/index.d.ts.map

+{"version":3,"file":"index.d.ts","sourceRoot":"","sources":["../../src/index.ts"],"names":[],"mappings":"AAAA;;;;;;;;;;;;;;;;;;;;;;;;;GAyBG;AAEH,OAAO,EAAE,KAAK,EAAE,MAAM,SAAS,CAAA;AAE/B;;;;;;;;;;GAUG;AACH,OAAO,EAAE,KAAK,EAAE,CAAA;AAEhB;;GAEG;AACH,OAAO,EAAE,OAAO,EAAE,mBAAmB,EAAE,MAAM,WAAW,CAAA;AAExD;;;;;;;;;GASG;AACH,YAAY,EAAE,OAAO,EAAE,UAAU,EAAE,cAAc,EAAE,MAAM,cAAc,CAAA"}

dist/src/match.d.ts

+/**
+ * Re-export module for backwards compatibility
+ *
+ * This module maintains backwards compatibility by re-exporting
+ * from the main Matcher module. New code should import from
+ * the root index.ts or directly from Matcher.ts
+ *
+ * @example
+ * ```typescript
+ * // Backwards compatible (legacy)
+ * import { match } from './match'
+ *
+ * // Recommended
+ * import { match } from '@anilkumarthakur/match'
+ * ```
+ */
+export { match } from './Matcher';
+/**
+ * Re-export all types from the types module
+ */
+export type { MatchChain, Handler, MatcherHandler } from './types/main';
+//# sourceMappingURL=match.d.ts.map

dist/src/match.d.ts.map

+{"version":3,"file":"match.d.ts","sourceRoot":"","sources":["../../src/match.ts"],"names":[],"mappings":"AAAA;;;;;;;;;;;;;;;GAeG;AACH,OAAO,EAAE,KAAK,EAAE,MAAM,WAAW,CAAA;AAEjC;;GAEG;AACH,YAAY,EAAE,UAAU,EAAE,OAAO,EAAE,cAAc,EAAE,MAAM,cAAc,CAAA"}

dist/src/Matcher.d.ts

+import { MatcherHandler } from './types/main';
+/**
+ * Error thrown when a match expression has no matching case and no default handler
+ *
+ * @class UnhandledMatchError
+ * @extends Error
+ *
+ * @example
+ * try {
+ *   match('foo')
+ *     .on('bar', () => 'never matches')
+ *     .valueOf()
+ * } catch (error) {
+ *   if (error instanceof UnhandledMatchError) {
+ *     console.error('No match found')
+ *   }
+ * }
+ */
+declare class UnhandledMatchError extends Error {
+    /**
+     * Create an UnhandledMatchError
+     *
+     * @param {unknown} value The value that could not be matched
+     */
+    constructor(value: unknown);
+}
+/**
+ * Matcher class implementing PHP-style match expressions for TypeScript/JavaScript
+ * Supports exhaustive matching with type safety and O(1) lookup performance
+ *
+ * @template TSubject The type of values being matched against
+ * @template TResult The return type of the match expression
+ *
+ * @class Matcher
+ *
+ * @example
+ * ```typescript
+ * const result = match('foo')
+ *   .on('foo', () => 'matched foo')
+ *   .on('bar', () => 'matched bar')
+ *   .otherwise(() => 'default')
+ * ```
+ *
+ * @example HTTP Status Codes
+ * ```typescript
+ * const message = match(statusCode)
+ *   .on(200, () => 'OK')
+ *   .onAny([201, 202], () => 'Accepted')
+ *   .on(404, () => 'Not Found')
+ *   .otherwise(() => 'Unknown')
+ * ```
+ */
+declare class Matcher<TSubject, TResult> {
+    /**
+     * The value being matched against
+     * @private
+     */
+    private readonly subject;
+    /**
+     * Map of values to their corresponding handler functions
+     * Uses Map for O(1) lookup performance
+     * @private
+     */
+    private readonly matches;
+    /**
+     * Default handler to execute if no cases match
+     * @private
+     */
+    private defaultHandler?;
+    /**
+     * Create a new Matcher instance
+     *
+     * @param {TSubject} subject The value to match against
+     *
+     * @internal Use the `match()` function instead of instantiating directly
+     */
+    constructor(subject: TSubject);
+    /**
+     * Add a case to match against the subject
+     * Uses strict equality (===) for comparison
+     *
+     * @param {TSubject} value The value to match against
+     * @param {MatcherHandler<TResult>} handler Function to execute if this value matches
+     * @returns {this} The matcher instance for method chaining
+     *
+     * @example
+     * ```typescript
+     * match('hello')
+     *   .on('hello', () => 'matched')
+     *   .on('goodbye', () => 'not matched')
+     * ```
+     */
+    on(value: TSubject, handler: MatcherHandler<TResult>): this;
+    /**
+     * Add multiple values that map to the same handler
+     * Simulates PHP's comma-separated case syntax
+     *
+     * @param {readonly TSubject[]} values Array of values to match
+     * @param {MatcherHandler<TResult>} handler Function to execute if any value matches
+     * @returns {this} The matcher instance for method chaining
+     *
+     * @example HTTP Status Codes
+     * ```typescript
+     * match(statusCode)
+     *   .onAny([200, 201, 202], () => 'Success')
+     *   .onAny([400, 401, 403], () => 'Client Error')
+     *   .otherwise(() => 'Unknown')
+     * ```
+     *
+     * @see on For matching a single value
+     */
+    onAny(values: readonly TSubject[], handler: MatcherHandler<TResult>): this;
+    /**
+     * Set the default handler and execute the match expression
+     * This method triggers evaluation of all accumulated cases
+     *
+     * @param {MatcherHandler<TResult>} handler Function to execute if no cases match
+     * @returns {TResult} The result from the matched handler or the default handler
+     * @throws {UnhandledMatchError} If no case matches and no handler catches it
+     *
+     * @example
+     * ```typescript
+     * const result = match(status)
+     *   .on('active', () => 'Active')
+     *   .on('inactive', () => 'Inactive')
+     *   .otherwise(() => 'Unknown status')
+     * ```
+     *
+     * @see default For PHP-compatible alias
+     * @see valueOf For executing without a default handler
+     */
+    otherwise(handler: MatcherHandler<TResult>): TResult;
+    /**
+     * PHP-compatible alias for otherwise()
+     * Identical behavior - sets default handler and executes
+     *
+     * @param {MatcherHandler<TResult>} handler Function to execute if no cases match
+     * @returns {TResult} The result from the matched handler or the default handler
+     * @throws {UnhandledMatchError} If no case matches
+     *
+     * @example
+     * ```typescript
+     * // PHP-style syntax
+     * const result = match(value)
+     *   .on('case1', () => 'Result1')
+     *   .default(() => 'Default')
+     * ```
+     *
+     * @see otherwise For the standard method
+     */
+    default(handler: MatcherHandler<TResult>): TResult;
+    /**
+     * Execute the match expression without a default handler
+     * Throws if no case matches
+     *
+     * @returns {TResult} The result from the matched handler
+     * @throws {UnhandledMatchError} If no case matches
+     *
+     * @example
+     * ```typescript
+     * try {
+     *   const result = match(code)
+     *     .on(200, () => 'OK')
+     *     .on(404, () => 'Not Found')
+     *     .valueOf() // Must have matched
+     * } catch (error) {
+     *   if (error instanceof UnhandledMatchError) {
+     *     console.error('Invalid code:', error.message)
+     *   }
+     * }
+     * ```
+     *
+     * @see otherwise For safe execution with default handler
+     */
+    valueOf(): TResult;
+    /**
+     * Evaluate the match expression by finding the matching case
+     *
+     * @private
+     * @returns {TResult} The result from matched handler or default
+     * @throws {UnhandledMatchError} If no match and no default handler
+     */
+    private evaluate;
+}
+/**
+ * Create a new PHP-style match expression
+ *
+ * @template TSubject The type of the value being matched
+ * @template TResult The return type of the match expression handlers
+ *
+ * @param {TSubject} subject The value to match against (any type)
+ * @returns {Matcher<TSubject, TResult>} A Matcher instance for method chaining
+ *
+ * @example Basic String Matching
+ * ```typescript
+ * const status = match(statusCode)
+ *   .on(200, () => 'success')
+ *   .on(404, () => 'not found')
+ *   .otherwise(() => 'error')
+ * ```
+ *
+ * @example HTTP Status Codes
+ * ```typescript
+ * const message = match(code)
+ *   .onAny([200, 201, 202], () => 'Success')
+ *   .onAny([400, 401, 403], () => 'Client Error')
+ *   .on(500, () => 'Server Error')
+ *   .otherwise(() => 'Unknown')
+ * ```
+ *
+ * @example Conditional Logic
+ * ```typescript
+ * const result = match(true)
+ *   .on(age < 18, () => 'Minor')
+ *   .on(age >= 18 && age < 65, () => 'Adult')
+ *   .on(age >= 65, () => 'Senior')
+ *   .otherwise(() => 'Unknown')
+ * ```
+ *
+ * @see Matcher For complete API documentation
+ */
+declare function match<TSubject, TResult>(subject: TSubject): Matcher<TSubject, TResult>;
+export { match, UnhandledMatchError, Matcher };
+//# sourceMappingURL=Matcher.d.ts.map

dist/src/Matcher.d.ts.map

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dist/src/types/main.d.ts

+/**
+ * Internal handler function type for match expression results
+ *
+ * Used internally by the Matcher class to store and execute handler functions.
+ * This is an alias for Handler<T> with the same signature.
+ *
+ * @template T The return type of the handler function
+ *
+ * @internal Internal use only
+ */
+export type MatcherHandler<T> = () => T;
+/**
+ * Handler function type for match expression results
+ *
+ * A handler is a function that takes no parameters and returns a value
+ * of type T. Used in match expressions to define what happens when a case matches.
+ *
+ * @template T The return type of the handler function
+ *
+ * @example
+ * ```typescript
+ * const handler: Handler<string> = () => 'matched'
+ * const numHandler: Handler<number> = () => 42
+ * ```
+ */
+export type Handler<T> = () => T;
+/**
+ * Interface representing a chainable match expression
+ *
+ * Provides the API contract for method chaining in match expressions.
+ * Implementations should support fluent interface patterns.
+ *
+ * @template TSubject The type of the value being matched against
+ * @template TResult The return type of handler functions
+ *
+ * @example
+ * ```typescript
+ * interface MatchChain<string, number> {
+ *   on: (value: string, handler: Handler<number>) => MatchChain<string, number>
+ *   otherwise: (handler: Handler<number>) => number
+ * }
+ * ```
+ */
+export interface MatchChain<TSubject, TResult> {
+    /**
+     * Add a case to match against the subject
+     *
+     * @param {TSubject} value The value to match
+     * @param {Handler<TResult>} handler Function to execute if matched
+     * @returns {MatchChain<TSubject, TResult>} The matcher for chaining
+     */
+    on: (value: TSubject, handler: Handler<TResult>) => MatchChain<TSubject, TResult>;
+    /**
+     * Set default handler and execute the match
+     *
+     * @param {Handler<TResult>} handler Function to execute if no cases match
+     * @returns {TResult} The result from matched handler or default
+     */
+    otherwise: (handler: Handler<TResult>) => TResult;
+}
+//# sourceMappingURL=main.d.ts.map

dist/src/types/main.d.ts.map

+{"version":3,"file":"main.d.ts","sourceRoot":"","sources":["../../../src/types/main.ts"],"names":[],"mappings":"AAAA;;;;;;;;;GASG;AACH,MAAM,MAAM,cAAc,CAAC,CAAC,IAAI,MAAM,CAAC,CAAA;AAEvC;;;;;;;;;;;;;GAaG;AACH,MAAM,MAAM,OAAO,CAAC,CAAC,IAAI,MAAM,CAAC,CAAA;AAEhC;;;;;;;;;;;;;;;;GAgBG;AACH,MAAM,WAAW,UAAU,CAAC,QAAQ,EAAE,OAAO;IAC3C;;;;;;OAMG;IACH,EAAE,EAAE,CAAC,KAAK,EAAE,QAAQ,EAAE,OAAO,EAAE,OAAO,CAAC,OAAO,CAAC,KAAK,UAAU,CAAC,QAAQ,EAAE,OAAO,CAAC,CAAA;IAEjF;;;;;OAKG;IACH,SAAS,EAAE,CAAC,OAAO,EAAE,OAAO,CAAC,OAAO,CAAC,KAAK,OAAO,CAAA;CAClD"}

dist/test/comprehensive.test.d.ts

+export {};
+//# sourceMappingURL=comprehensive.test.d.ts.map

dist/test/comprehensive.test.d.ts.map

+{"version":3,"file":"comprehensive.test.d.ts","sourceRoot":"","sources":["../../test/comprehensive.test.ts"],"names":[],"mappings":""}

dist/test/coverage.test.d.ts

+export {};
+//# sourceMappingURL=coverage.test.d.ts.map

dist/test/coverage.test.d.ts.map

+{"version":3,"file":"coverage.test.d.ts","sourceRoot":"","sources":["../../test/coverage.test.ts"],"names":[],"mappings":""}

dist/test/match.test.d.ts

+export {};
+//# sourceMappingURL=match.test.d.ts.map

dist/test/match.test.d.ts.map

+{"version":3,"file":"match.test.d.ts","sourceRoot":"","sources":["../../test/match.test.ts"],"names":[],"mappings":""}

dist/test/match1.test.d.ts

+export {};
+//# sourceMappingURL=match1.test.d.ts.map

dist/test/match1.test.d.ts.map

+{"version":3,"file":"match1.test.d.ts","sourceRoot":"","sources":["../../test/match1.test.ts"],"names":[],"mappings":""}

dist/test/match2.test.d.ts

+export {};
+//# sourceMappingURL=match2.test.d.ts.map

dist/test/match2.test.d.ts.map

+{"version":3,"file":"match2.test.d.ts","sourceRoot":"","sources":["../../test/match2.test.ts"],"names":[],"mappings":""}

test/comprehensive.test.ts

+import { match, UnhandledMatchError, Matcher } from '../src/Matcher'
+
+beforeEach(() => {
+  jest.clearAllMocks()
+})
+
+describe('Match Expression - Comprehensive Test Suite', () => {
+  // ============================================================================
+  // BASIC FUNCTIONALITY TESTS
+  // ============================================================================
+  describe('Basic Functionality', () => {
+    test('should return the correct action for the matched case', () => {
+      const result = match('test')
+        .on('test', () => 'matched')
+        .on('not matched', () => 'not matched')
+        .otherwise(() => 'otherwise')
+      expect(result).toBe('matched')
+    })
+
+    test('should return the otherwise action if no cases are matched', () => {
+      const result = match('test')
+        .on('not matched', () => 'not matched')
+        .otherwise(() => 'otherwise')
+      expect(result).toBe('otherwise')
+      expect(result).not.toBe('not matched')
+    })
+
+    test('should correctly handle multiple cases with one match', () => {
+      const result = match('second')
+        .on('first', () => 'first case')
+        .on('second', () => 'second case')
+        .on('third', () => 'third case')
+        .otherwise(() => 'otherwise')
+      expect(result).toBe('second case')
+      expect(result).not.toBe('first case')
+      expect(result).not.toBe('third case')
+      expect(result).not.toBe('otherwise')
+    })
+
+    test('should execute the default action when provided', () => {
+      const result = match('none')
+        .on('first', () => 'first case')
+        .on('second', () => 'second case')
+        .otherwise(() => 'default action')
+      expect(result).toBe('default action')
+      expect(result).not.toBe('first case')
+      expect(result).not.toBe('second case')
+    })
+
+    test('should correctly handle no cases with only otherwise', () => {
+      const result = match('none').otherwise(() => 'default action')
+      expect(result).toBe('default action')
+      expect(result).not.toBe('first case')
+    })
+
+    test('executes the matching handler when subject matches an on condition', () => {
+      const result = match('success')
+        .on('success', () => 'success-handler')
+        .on('error', () => 'error-handler')
+        .otherwise(() => 'otherwise-handler')
+
+      expect(result).toBe('success-handler')
+    })
+
+    test('executes otherwise handler if no conditions match', () => {
+      const result = match('not-found')
+        .on('success', () => 'success-handler')
+        .on('error', () => 'error-handler')
+        .otherwise(() => 'otherwise-handler')
+
+      expect(result).toBe('otherwise-handler')
+    })
+
+    test('executes otherwise if no handler is defined at all', () => {
+      const result = match('anything').otherwise(() => 'no-cases')
+      expect(result).toBe('no-cases')
+    })
+  })
+
+  // ============================================================================
+  // TYPE MATCHING TESTS
+  // ============================================================================
+  describe('Type Matching', () => {
+    describe('String Matching', () => {
+      test('matches string literal', () => {
+        expect(
+          match('hello')
+            .on('hello', () => 'matched')
+            .otherwise(() => 'default')
+        ).toBe('matched')
+
+        expect(
+          match('world')
+            .on('hello', () => 'matched')
+            .on('world', () => 'world')
+            .otherwise(() => 'default')
+        ).toBe('world')
+      })
+
+      test('string does not match different string', () => {
+        expect(
+          match('hello')
+            .on('world', () => 'world')
+            .on('hellos', () => 'hellos')
+            .otherwise(() => 'default')
+        ).toBe('default')
+      })
+
+      test('empty string matches', () => {
+        expect(
+          match('')
+            .on('', () => 'empty')
+            .otherwise(() => 'default')
+        ).toBe('empty')
+      })
+    })
+
+    describe('Number Matching', () => {
+      test('matches integer', () => {
+        expect(
+          match(42)
+            .on(42, () => 'forty-two')
+            .otherwise(() => 'default')
+        ).toBe('forty-two')
+      })
+
+      test('matches zero', () => {
+        expect(
+          match(0)
+            .on(0, () => 'zero')
+            .otherwise(() => 'default')
+        ).toBe('zero')
+      })
+
+      test('+0 matches -0', () => {
+        expect(
+          match(+0)
+            .on(-0, () => 'zero matched')
+            .otherwise(() => 'default')
+        ).toBe('zero matched')
+      })
+
+      test('matches negative number', () => {
+        expect(
+          match(-1)
+            .on(-1, () => 'negative one')
+            .otherwise(() => 'default')
+        ).toBe('negative one')
+      })
+
+      test('matches decimal number', () => {
+        expect(
+          match(3.14)
+            .on(3.14, () => 'pi')
+            .otherwise(() => 'default')
+        ).toBe('pi')
+      })
+
+      test('does not match different number', () => {
+        expect(
+          match(10)
+            .on(9, () => 'nine')
+            .otherwise(() => 'default')
+        ).toBe('default')
+      })
+
+      test('0 subject matches -0 key', () => {
+        expect(
+          match(0)
+            .on(-0, () => 'minus zero')
+            .otherwise(() => 'default')
+        ).toBe('minus zero')
+      })
+
+      test('matches Infinity', () => {
+        expect(
+          match(Infinity)
+            .on(Infinity, () => 'infinity matched')
+            .otherwise(() => 'default')
+        ).toBe('infinity matched')
+      })
+
+      test('matches -Infinity', () => {
+        expect(
+          match(-Infinity)
+            .on(-Infinity, () => 'minus infinity matched')
+            .otherwise(() => 'default')
+        ).toBe('minus infinity matched')
+      })
+    })
+
+    describe('Boolean Matching', () => {
+      test('should correctly handle default true parameter', () => {
+        const result = match(true)
+          .on(true, () => true)
+          .otherwise(() => 'default action')
+        expect(result).toBe(true)
+        expect(result).not.toBe('default action')
+      })
+
+      test('should correctly handle default false parameter', () => {
+        const result = match(true)
+          .on(true, () => 'true case')
+          .otherwise(() => 'default action')
+        expect(result).toBe('true case')
+        expect(result).not.toBe('default action')
+      })
+
+      test('should correctly handle default false case', () => {
+        const result = match(false)
+          .on(true, () => true)
+          .otherwise(() => 'default action')
+        expect(result).toBe('default action')
+        expect(result).not.toBe(true)
+      })
+
+      test('should correctly handle default true case', () => {
+        const result = match(false)
+          .on(false, () => false)
+          .otherwise(() => 'default action')
+        expect(result).toBe(false)
+        expect(result).not.toBe('default action')
+      })
+
+      test('matches true', () => {
+        expect(
+          match(true)
+            .on(true, () => 'yes')
+            .otherwise(() => 'no')
+        ).toBe('yes')
+      })
+
+      test('matches false', () => {
+        expect(
+          match(false)
+            .on(false, () => 'no')
+            .otherwise(() => 'yes')
+        ).toBe('no')
+      })
+
+      test('false does not match true', () => {
+        expect(
+          match(false)
+            .on(true, () => 'yes')
+            .otherwise(() => 'no')
+        ).toBe('no')
+      })
+    })
+
+    describe('Null and Undefined Matching', () => {
+      test('should correctly handle default null case', () => {
+        const result = match(null)
+          .on(null, () => null)
+          .otherwise(() => 'default action')
+        expect(result).toBe(null)
+        expect(result).not.toBe('default action')
+      })
+
+      test('should correctly handle default undefined case', () => {
+        const result = match(undefined)
+          .on(undefined, () => undefined)
+          .otherwise(() => 'default action')
+        expect(result).toBe(undefined)
+        expect(result).not.toBe('default action')
+      })
+
+      test('matches null', () => {
+        expect(
+          match(null)
+            .on(null, () => 'null matched')
+            .otherwise(() => 'default')
+        ).toBe('null matched')
+      })
+
+      test('matches undefined', () => {
+        expect(
+          match(undefined)
+            .on(undefined, () => 'undefined matched')
+            .otherwise(() => 'default')
+        ).toBe('undefined matched')
+      })
+
+      test('subject null matches correctly with side effect', () => {
+        const fn = jest.fn(() => 'matched')
+        const result = match(null)
+          .on(null, fn)
+          .otherwise(() => 'default')
+        expect(result).toBe('matched')
+        expect(fn).toHaveBeenCalledTimes(1)
+      })
+    })
+
+    describe('Symbol Matching', () => {
+      test('matches same symbol', () => {
+        const sym = Symbol('foo')
+        expect(
+          match(sym)
+            .on(sym, () => 'symbol matched')
+            .otherwise(() => 'default')
+        ).toBe('symbol matched')
+      })
+
+      test('does not match different symbols', () => {
+        expect(
+          match(Symbol('foo'))
+            .on(Symbol('foo'), () => 'symbol matched')
+            .otherwise(() => 'default')
+        ).toBe('default')
+      })
+    })
+
+    describe('BigInt Matching', () => {
+      test('matches BigInt', () => {
+        expect(
+          match(10n)
+            .on(10n, () => 'bigint matched')
+            .otherwise(() => 'default')
+        ).toBe('bigint matched')
+      })
+
+      test('does not match different BigInt', () => {
+        expect(
+          match(10n)
+            .on(20n, () => 'bigint matched')
+            .otherwise(() => 'default')
+        ).toBe('default')
+      })
+    })
+
+    describe('Object and Array Reference Matching', () => {
+      test('matches same object reference', () => {
+        const obj = { a: 1 }
+        expect(
+          match(obj)
+            .on(obj, () => 'matched object')
+            .otherwise(() => 'default')
+        ).toBe('matched object')
+      })
+
+      test('does not match identical object by value', () => {
+        expect(
+          match({ a: 1 })
+            .on({ a: 1 }, () => 'matched object')
+            .otherwise(() => 'default')
+        ).toBe('default')
+      })
+
+      test('matches same array reference', () => {
+        const arr = [1, 2]
+        expect(
+          match(arr)
+            .on(arr, () => 'matched array')
+            .otherwise(() => 'default')
+        ).toBe('matched array')
+      })
+
+      test('does not match identical array by value', () => {
+        expect(
+          match([1, 2])
+            .on([1, 2], () => 'matched array')
+            .otherwise(() => 'default')
+        ).toBe('default')
+      })
+
+      test('object with toString does not affect matching', () => {
+        const obj = {
+          toString() {
+            return 'foo'
+          }
+        }
+        expect(
+          match(obj)
+            .on(obj, () => 'matched')
+            .otherwise(() => 'default')
+        ).toBe('matched')
+      })
+    })
+
+    describe('Function and Class Instance Matching', () => {
+      test('matches same function reference', () => {
+        const fn = () => {}
+        expect(
+          match(fn)
+            .on(fn, () => 'matched fn')
+            .otherwise(() => 'default')
+        ).toBe('matched fn')
+      })
+
+      test('does not match different function with same implementation', () => {
+        expect(
+          match(() => {})
+            .on(
+              () => {},
+              () => 'matched fn'
+            )
+            .otherwise(() => 'default')
+        ).toBe('default')
+      })
+
+      test('class instance matching by reference', () => {
+        class A {}
+        const a = new A()
+        expect(
+          match(a)
+            .on(a, () => 'matched instance')
+            .otherwise(() => 'default')
+        ).toBe('matched instance')
+      })
+
+      test('different class instance no match', () => {
+        class A {}
+        expect(
+          match(new A())
+            .on(new A(), () => 'matched instance')
+            .otherwise(() => 'default')
+        ).toBe('default')
+      })
+    })
+
+    describe('Enum Matching', () => {
+      enum Color {
+        Red,
+        Blue,
+        Green
+      }
+      test('matches TypeScript enum', () => {
+        expect(
+          match(Color.Blue)
+            .on(Color.Red, () => 'red')
+            .on(Color.Blue, () => 'blue')
+            .on(Color.Green, () => 'green')
+            .otherwise(() => 'unknown')
+        ).toBe('blue')
+      })
+    })
+  })
+
+  // ============================================================================
+  // ON METHOD TESTS
+  // ============================================================================
+  describe('on() Method', () => {
+    test('works with multiple conditions and ensures the first match is used', () => {
+      const result = match('spinner')
+        .on('success', () => 'success-handler')
+        .on('error', () => 'error-handler')
+        .on('warning', () => 'warning-handler')
+        .on('info', () => 'info-handler')
+        .on('defaultNotify', () => 'defaultNotify-handler')
+        .on('dark', () => 'dark-handler')
+        .on('light', () => 'light-handler')
+        .on('spinner', () => 'spinner-handler')
+        .otherwise(() => 'otherwise-handler')
+
+      expect(result).toBe('spinner-handler')
+    })
+
+    test('executes the correct handler when multiple .on are provided and matches the later one', () => {
+      const result = match('error')
+        .on('info', () => 'info-handler')
+        .on('success', () => 'success-handler')
+        .on('error', () => 'error-handler')
+        .on('warning', () => 'warning-handler')
+        .otherwise(() => 'otherwise-handler')
+
+      expect(result).toBe('error-handler')
+    })
+
+    test('chain .on returns this for chaining', () => {
+      const matcher = match('a')
+        .on('a', () => 'A')
+        .on('b', () => 'B')
+      expect(typeof matcher.otherwise).toBe('function')
+    })
+
+    test('many chained .on calls', () => {
+      const result = match('x')
+        .on('a', () => 'A')
+        .on('b', () => 'B')
+        .on('c', () => 'C')
+        .on('x', () => 'X')
+        .otherwise(() => 'default')
+      expect(result).toBe('X')
+    })
+
+    test('duplicate keys overwrite previous handlers', () => {
+      const result = match('key')
+        .on('key', () => 'first')
+        .on('key', () => 'second')
+        .otherwise(() => 'default')
+      expect(result).toBe('second')
+    })
+
+    test('same handler used for multiple keys', () => {
+      const handler = jest.fn(() => 'handled')
+      const result = match('bar')
+        .on('foo', handler)
+        .on('bar', handler)
+        .otherwise(() => 'default')
+      expect(result).toBe('handled')
+      expect(handler).toHaveBeenCalledTimes(1)
+    })
+  })
+
+  // ============================================================================
+  // ONANY METHOD TESTS
+  // ============================================================================
+  describe('onAny() Method', () => {
+    test('onAny - matches multiple values to same handler', () => {
+      const result = match('a')
+        .onAny(['a', 'b', 'c'], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - matches second value in array', () => {
+      const result = match('b')
+        .onAny(['a', 'b', 'c'], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - matches last value in array', () => {
+      const result = match('c')
+        .onAny(['a', 'b', 'c'], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - does not match value outside array', () => {
+      const result = match('d')
+        .onAny(['a', 'b', 'c'], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('default')
+    })
+
+    test('onAny - works with numbers', () => {
+      const result = match(2)
+        .onAny([1, 2, 3], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - empty array does not match', () => {
+      const result = match('a')
+        .onAny([], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('default')
+    })
+
+    test('onAny - chaining with multiple onAny calls', () => {
+      const result = match('x')
+        .onAny(['a', 'b'], () => 'first')
+        .onAny(['x', 'y'], () => 'second')
+        .otherwise(() => 'default')
+      expect(result).toBe('second')
+    })
+
+    test('onAny - readonly array support', () => {
+      const values: readonly string[] = ['foo', 'bar']
+      const result = match('foo')
+        .onAny(values, () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - mixed with on() method', () => {
+      const result = match('b')
+        .on('a', () => 'single')
+        .onAny(['b', 'c'], () => 'multiple')
+        .otherwise(() => 'default')
+      expect(result).toBe('multiple')
+    })
+
+    test('onAny - handler with side effects', () => {
+      const fn = jest.fn(() => 'matched')
+      const result = match('b')
+        .onAny(['a', 'b', 'c'], fn)
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+      expect(fn).toHaveBeenCalledTimes(1)
+    })
+
+    test('onAny - returns this for chaining', () => {
+      const matcher = match('a')
+        .onAny(['a', 'b'], () => 'test')
+      expect(typeof matcher.on).toBe('function')
+      expect(typeof matcher.otherwise).toBe('function')
+    })
+  })
+
+  // ============================================================================
+  // OTHERWISE METHOD TESTS
+  // ============================================================================
+  describe('otherwise() Method', () => {
+    test('default handler called', () => {
+      const defFn = jest.fn(() => 'default')
+      const result = match('nope')
+        .on('something', () => 'something')
+        .otherwise(defFn)
+      expect(result).toBe('default')
+      expect(defFn).toHaveBeenCalledTimes(1)
+    })
+
+    test('multiple otherwise calls use last handler', () => {
+      const matcher = match('foo').on('bar', () => 'bar')
+      expect(matcher.otherwise(() => 'first')).toBe('first')
+      expect(matcher.otherwise(() => 'second')).toBe('second')
+    })
+
+    test('check that console logs or side effects can happen inside handlers', () => {
+      const consoleSpy = jest.spyOn(console, 'log').mockImplementation(() => {})
+
+      const result = match('warning')
+        .on('success', () => {
+          console.log('success log')
+          return 'success-handler'
+        })
+        .on('warning', () => {
+          console.log('warning log')
+          return 'warning-handler'
+        })
+        .otherwise(() => {
+          console.log('otherwise log')
+          return 'otherwise-handler'
+        })
+
+      expect(result).toBe('warning-handler')
+      expect(consoleSpy).toHaveBeenCalledWith('warning log')
+      expect(consoleSpy).not.toHaveBeenCalledWith('success log')
+      expect(consoleSpy).not.toHaveBeenCalledWith('otherwise log')
+
+      consoleSpy.mockRestore()
+    })
+  })
+
+  // ============================================================================
+  // DEFAULT METHOD TESTS
+  // ============================================================================
+  describe('default() Method - PHP Compatibility', () => {
+    test('default - executes handler and returns result', () => {
+      const result = match('foo')
+        .on('bar', () => 'bar')
+        .default(() => 'default result')
+      expect(result).toBe('default result')
+    })
+
+    test('default - matches case if found', () => {
+      const result = match('foo')
+        .on('foo', () => 'matched')
+        .default(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('default - works with multiple cases', () => {
+      const result = match('c')
+        .on('a', () => 'a')
+        .on('b', () => 'b')
+        .default(() => 'default')
+      expect(result).toBe('default')
+    })
+
+    test('default - returns various types', () => {
+      expect(
+        match('x')
+          .on('y', () => 'str')
+          .default(() => 'default')
+      ).toBe('default')
+
+      expect(
+        match('x')
+          .on('y', () => 123)
+          .default(() => 456)
+      ).toBe(456)
+
+      expect(
+        match('x')
+          .on('y', () => true)
+          .default(() => false)
+      ).toBe(false)
+    })
+
+    test('default - is equivalent to otherwise', () => {
+      const matcher1 = match('test')
+        .on('other', () => 'other')
+
+      const matcher2 = match('test')
+        .on('other', () => 'other')
+
+      const defaultResult = matcher1.default(() => 'default')
+      const otherwiseResult = matcher2.otherwise(() => 'default')
+
+      expect(defaultResult).toBe(otherwiseResult)
+    })
+
+    test('default - executes handler with side effects', () => {
+      const fn = jest.fn(() => 'result')
+      const result = match('no-match')
+        .on('something', () => 'something')
+        .default(fn)
+      expect(result).toBe('result')
+      expect(fn).toHaveBeenCalledTimes(1)
+    })
+
+    test('default - can override previous default', () => {
+      const matcher = match('x').on('y', () => 'y')
+      expect(matcher.default(() => 'first')).toBe('first')
+      expect(matcher.default(() => 'second')).toBe('second')
+    })
+
+    test('default - throws when no match and handler throws', () => {
+      expect(() =>
+        match('x')
+          .on('y', () => 'y')
+          .default(() => {
+            throw new Error('Custom error')
+          })
+      ).toThrow('Custom error')
+    })
+
+    test('default - with null result', () => {
+      const result = match('x')
+        .on('y', () => 'y')
+        .default(() => null)
+      expect(result).toBeNull()
+    })
+
+    test('default - with undefined result', () => {
+      const result = match('x')
+        .on('y', () => 'y')
+        .default(() => undefined)
+      expect(result).toBeUndefined()
+    })
+  })
+
+  // ============================================================================
+  // VALUEOF METHOD TESTS
+  // ============================================================================
+  describe('valueOf() Method', () => {
+    test('valueOf - returns matched handler result', () => {
+      const result = match('foo')
+        .on('foo', () => 'matched')
+        .valueOf()
+      expect(result).toBe('matched')
+    })
+
+    test('valueOf - throws UnhandledMatchError when no match', () => {
+      expect(() => {
+        match('foo')
+          .on('bar', () => 'bar')
+          .valueOf()
+      }).toThrow(UnhandledMatchError)
+    })
+
+    test('valueOf - throws with correct error message', () => {
+      expect(() => {
+        match('test-value')
+          .on('other', () => 'other')
+          .valueOf()
+      }).toThrow('Unhandled match value: "test-value"')
+    })
+
+    test('valueOf - with multiple cases, first match wins', () => {
+      const result = match('b')
+        .on('a', () => 'first')
+        .on('b', () => 'second')
+        .on('c', () => 'third')
+        .valueOf()
+      expect(result).toBe('second')
+    })
+
+    test('valueOf - returns various types', () => {
+      expect(
+        match('str')
+          .on('str', () => 'string result')
+          .valueOf()
+      ).toBe('string result')
+
+      expect(
+        match('num')
+          .on('num', () => 42)
+          .valueOf()
+      ).toBe(42)
+
+      expect(
+        match('bool')
+          .on('bool', () => true)
+          .valueOf()
+      ).toBe(true)
+    })
+
+    test('valueOf - with object result', () => {
+      const obj = { key: 'value' }
+      const result = match('obj')
+        .on('obj', () => obj)
+        .valueOf()
+      expect(result).toBe(obj)
+    })
+
+    test('valueOf - with array result', () => {
+      const arr = [1, 2, 3]
+      const result = match('arr')
+        .on('arr', () => arr)
+        .valueOf()
+      expect(result).toBe(arr)
+    })
+
+    test('valueOf - with function result', () => {
+      const fn = () => 'test'
+      const result = match('fn')
+        .on('fn', () => fn)
+        .valueOf()
+      expect(result).toBe(fn)
+    })
+
+    test('valueOf - with null result', () => {
+      const result = match('null')
+        .on('null', () => null)
+        .valueOf()
+      expect(result).toBeNull()
+    })
+
+    test('valueOf - with undefined result', () => {
+      const result = match('undef')
+        .on('undef', () => undefined)
+        .valueOf()
+      expect(result).toBeUndefined()
+    })
+
+    test('valueOf - called multiple times returns same result', () => {
+      const matcher = match('a')
+        .on('a', () => 'result')
+      expect(matcher.valueOf()).toBe('result')
+      expect(matcher.valueOf()).toBe('result')
+    })
+
+    test('valueOf - throws error from handler', () => {
+      expect(() => {
+        match('error')
+          .on('error', () => {
+            throw new Error('Handler error')
+          })
+          .valueOf()
+      }).toThrow('Handler error')
+    })
+
+    test('valueOf - with complex nested matching', () => {
+      const result = match('status')
+        .on('loading', () => 'loading')
+        .on('status', () => {
+          return match('details')
+            .on('details', () => 'detailed status')
+            .valueOf()
+        })
+        .valueOf()
+      expect(result).toBe('detailed status')
+    })
+
+    test('Match function test', () => {
+      expect(() =>
+        match(1)
+          .on(1, () => 1)
+          .otherwise(() => 'default action')
+      ).not.toThrow()
+      expect(() =>
+        match(2)
+          .on(1, () => 1)
+          .otherwise(() => 'default action')
+      ).not.toThrow()
+    })
+  })
+
+  // ============================================================================
+  // HANDLER BEHAVIOR TESTS
+  // ============================================================================
+  describe('Handler Behavior and Side Effects', () => {
+    test('only calls matching handler', () => {
+      const fn1 = jest.fn(() => 'foo')
+      const fn2 = jest.fn(() => 'bar')
+      const fnDefault = jest.fn(() => 'default')
+      const result = match('bar').on('foo', fn1).on('bar', fn2).otherwise(fnDefault)
+      expect(result).toBe('bar')
+      expect(fn1).not.toHaveBeenCalled()
+      expect(fn2).toHaveBeenCalledTimes(1)
+      expect(fnDefault).not.toHaveBeenCalled()
+    })
+
+    test('handler modifies external variable', () => {
+      let called = false
+      const result = match('test')
+        .on('test', () => {
+          called = true
+          return 'ok'
+        })
+        .otherwise(() => 'fail')
+      expect(result).toBe('ok')
+      expect(called).toBe(true)
+    })
+
+    test('handlers return various types', () => {
+      expect(
+        match('str')
+          .on('str', () => 'string')
+          .otherwise(() => 'default')
+      ).toBe('string')
+      expect(
+        match('num')
+          .on('num', () => 123)
+          .otherwise(() => 0)
+      ).toBe(123)
+      expect(
+        match('bool')
+          .on('bool', () => true)
+          .otherwise(() => false)
+      ).toBe(true)
+      const obj = { foo: 'bar' }
+      expect(
+        match('obj')
+          .on('obj', () => obj)
+          .otherwise(() => ({}))
+      ).toBe(obj)
+      expect(
+        match('undef')
+          .on('undef', () => undefined)
+          .otherwise(() => 'default')
+      ).toBeUndefined()
+    })
+
+    test('async handler returns Promise', async () => {
+      const result = match('async')
+        .on('async', async () => 'resolved')
+        .otherwise(() => 'default')
+      await expect(result).resolves.toBe('resolved')
+    })
+
+    test('handler throws exception', () => {
+      expect(() =>
+        match('test')
+          .on('test', () => {
+            throw new Error('Handler error')
+          })
+          .otherwise(() => 'default')
+      ).toThrow('Handler error')
+    })
+  })
+
+  // ============================================================================
+  // ERROR HANDLING TESTS
+  // ============================================================================
+  describe('Error Handling', () => {
+    test('throws UnhandledMatchError when no match and no default', () => {
+      expect(() => {
+        match('nope')
+          .on('something', () => 'something')
+          .otherwise(() => {
+            throw new UnhandledMatchError('nope')
+          })
+      }).toThrow(UnhandledMatchError)
+      expect(() => {
+        match('nope')
+          .on('something', () => 'something')
+          .otherwise(() => {
+            throw new UnhandledMatchError('nope')
+          })
+      }).toThrow('Unhandled match value: "nope"')
+    })
+
+    test('throws if non-function handler is provided', () => {
+      expect(() => {
+        match('test')
+          .on('tests', () => 'not a function')
+          .otherwise(() => {
+            throw new UnhandledMatchError('nope')
+          })
+      }).toThrow()
+    })
+  })
+
+  // ============================================================================
+  // MATCHER CLASS TESTS
+  // ============================================================================
+  describe('Matcher Class', () => {
+    test('Matcher constructor creates instance', () => {
+      const matcher = new Matcher('test')
+      expect(matcher).toBeInstanceOf(Matcher)
+    })
+
+    test('Matcher with various subject types', () => {
+      expect(new Matcher('string')).toBeInstanceOf(Matcher)
+      expect(new Matcher(123)).toBeInstanceOf(Matcher)
+      expect(new Matcher(true)).toBeInstanceOf(Matcher)
+      expect(new Matcher(null)).toBeInstanceOf(Matcher)
+      expect(new Matcher(undefined)).toBeInstanceOf(Matcher)
+      expect(new Matcher({})).toBeInstanceOf(Matcher)
+      expect(new Matcher([])).toBeInstanceOf(Matcher)
+    })
+
+    test('Matcher.on returns this', () => {
+      const matcher = new Matcher('test')
+      const result = matcher.on('test', () => 'result')
+      expect(result).toBe(matcher)
+    })
+
+    test('Matcher.onAny returns this', () => {
+      const matcher = new Matcher('test')
+      const result = matcher.onAny(['test'], () => 'result')
+      expect(result).toBe(matcher)
+    })
+  })
+
+  // ============================================================================
+  // UNHANDLED MATCH ERROR TESTS
+  // ============================================================================
+  describe('UnhandledMatchError', () => {
+    test('UnhandledMatchError is instance of Error', () => {
+      const error = new UnhandledMatchError('test')
+      expect(error).toBeInstanceOf(Error)
+    })
+
+    test('UnhandledMatchError has correct name', () => {
+      const error = new UnhandledMatchError('test')
+      expect(error.name).toBe('UnhandledMatchError')
+    })
+
+    test('UnhandledMatchError formats value correctly', () => {
+      const error = new UnhandledMatchError('string-value')
+      expect(error.message).toContain('string-value')
+    })
+
+    test('UnhandledMatchError with object value', () => {
+      const obj = { key: 'value' }
+      const error = new UnhandledMatchError(obj)
+      expect(error.message).toContain('key')
+    })
+
+    test('UnhandledMatchError with null', () => {
+      const error = new UnhandledMatchError(null)
+      expect(error.message).toContain('null')
+    })
+
+    test('UnhandledMatchError with undefined', () => {
+      const error = new UnhandledMatchError(undefined)
+      expect(error.message).toContain('undefined')
+    })
+  })
+
+  // ============================================================================
+  // TYPE SAFETY TESTS
+  // ============================================================================
+  describe('Type Safety', () => {
+    test('enforces consistent subject types', () => {
+      const result = match<string, string>('test')
+        .on('test', () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('enforces consistent return types', () => {
+      const result = match<string, number>('test')
+        .on('test', () => 1)
+        .otherwise(() => 2)
+      expect(result).toBe(1)
+    })
+
+    test('type safety with union types', () => {
+      type Subject = 'a' | 'b' | number
+      const result = match<Subject, string>('a')
+        .on('a', () => 'A')
+        .on('b', () => 'B')
+        .on(42, () => 'Number')
+        .otherwise(() => 'default')
+      expect(result).toBe('A')
+    })
+  })
+
+  // ============================================================================
+  // REAL-WORLD EXAMPLES
+  // ============================================================================
+  describe('Real-World Examples', () => {
+    test('handleCheck example from user', () => {
+      const handleCheck = (types: string) => {
+        return match(types)
+          .on('success', () => {
+            console.log('----------------success output--', 'success')
+            return 'success'
+          })
+          .on('error', () => {
+            console.log('----------------error output--', 'error')
+            return 'error'
+          })
+          .on('warning', () => {
+            console.log('----------------warning output--', 'warning')
+            return 'warning'
+          })
+          .on('info', () => {
+            console.log('----------------info output--', 'info')
+            return 'info'
+          })
+          .on('defaultNotify', () => {
+            console.log('----------------defaultNotify output--', 'defaultNotify')
+            return 'defaultNotify'
+          })
+          .on('dark', () => {
+            console.log('----------------dark output--', 'dark')
+            return 'dark'
+          })
+          .on('light', () => {
+            console.log('----------------light output--', 'light')
+            return 'light'
+          })
+          .on('spinner', () => {
+            console.log('----------------spinner output--', 'spinner')
+            return 'spinner'
+          })
+          .otherwise(() => {
+            console.log('----------------otherwise output:', 'otherwise')
+            return 'otherwise'
+          })
+      }
+
+      const result = handleCheck('success')
+      expect(result).toBe('success')
+
+      const result2 = handleCheck('unmatched')
+      expect(result2).toBe('otherwise')
+    })
+
+    test('complexCheck example with various data types', () => {
+      const complexCheck = (input: unknown) => {
+        return match(input)
+          .on('hello', () => 'Matched hello')
+          .on(42, () => 'Matched number 42')
+          .on(true, () => 'Matched true')
+          .on(null, () => 'Matched null')
+          .on(undefined, () => 'Matched undefined')
+          .otherwise(() => 'No match found')
+      }
+      expect(complexCheck('hello')).toBe('Matched hello')
+      expect(complexCheck(42)).toBe('Matched number 42')
+      expect(complexCheck(true)).toBe('Matched true')
+      expect(complexCheck(null)).toBe('Matched null')
+      expect(complexCheck(undefined)).toBe('Matched undefined')
+      expect(complexCheck('unmatched')).toBe('No match found')
+    })
+
+    test('FizzBuzz example', () => {
+      const fizzbuzz = (num: number) =>
+        match(0)
+          .on(num % 15, () => 'FizzBuzz')
+          .on(num % 3, () => 'Fizz')
+          .on(num % 5, () => 'Buzz')
+          .otherwise(() => num.toString())
+      expect(fizzbuzz(3)).toBe('Fizz')
+      expect(fizzbuzz(5)).toBe('Buzz')
+      expect(fizzbuzz(7)).toBe('7')
+    })
+
+    test('days in month example', () => {
+      const isLeap = (year: number) => year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0)
+      const daysInMonth = (month: string, year: number) =>
+        match(month.toLowerCase().slice(0, 3))
+          .on('jan', () => 31)
+          .on('feb', () => (isLeap(year) ? 29 : 28))
+          .on('mar', () => 31)
+          .on('apr', () => 30)
+          .on('may', () => 31)
+          .on('jun', () => 30)
+          .on('jul', () => 31)
+          .on('aug', () => 31)
+          .on('sep', () => 30)
+          .on('oct', () => 31)
+          .on('nov', () => 30)
+          .on('dec', () => 31)
+          .otherwise(() => {
+            throw new Error('Bogus month')
+          })
+      expect(daysInMonth('January', 2025)).toBe(31)
+      expect(daysInMonth('February', 2024)).toBe(29)
+      expect(daysInMonth('February', 2025)).toBe(28)
+      expect(daysInMonth('April', 2025)).toBe(30)
+      expect(() => daysInMonth('Invalid', 2025)).toThrow('Bogus month')
+    })
+
+    test('HTTP status code handler', () => {
+      const handleResponse = (status: number) => {
+        return match(status)
+          .on(200, () => 'OK')
+          .onAny([201, 202, 204], () => 'Created/Accepted')
+          .on(400, () => 'Bad Request')
+          .on(401, () => 'Unauthorized')
+          .on(403, () => 'Forbidden')
+          .on(404, () => 'Not Found')
+          .on(500, () => 'Server Error')
+          .default(() => 'Unknown Status')
+      }
+
+      expect(handleResponse(200)).toBe('OK')
+      expect(handleResponse(201)).toBe('Created/Accepted')
+      expect(handleResponse(404)).toBe('Not Found')
+      expect(handleResponse(999)).toBe('Unknown Status')
+    })
+
+    test('Nested match expressions', () => {
+      const getUserStatus = (userId: string, status: string) => {
+        return match(userId)
+          .on('admin', () => {
+            return match(status)
+              .on('active', () => 'admin is active')
+              .on('inactive', () => 'admin is inactive')
+              .default(() => 'admin status unknown')
+          })
+          .on('user', () => {
+            return match(status)
+              .on('active', () => 'user is active')
+              .default(() => 'user is inactive')
+          })
+          .default(() => 'user not found')
+      }
+
+      expect(getUserStatus('admin', 'active')).toBe('admin is active')
+      expect(getUserStatus('user', 'active')).toBe('user is active')
+      expect(getUserStatus('guest', 'active')).toBe('user not found')
+    })
+
+    test('Non-identity check with true subject for range matching', () => {
+      const age = 23
+      expect(
+        match(true)
+          .on(age >= 65, () => 'senior')
+          .on(age >= 25, () => 'adult')
+          .on(age >= 18, () => 'young adult')
+          .otherwise(() => 'kid')
+      ).toBe('young adult')
+    })
+
+    test('Non-identity check with true subject for string content', () => {
+      const text = 'Bienvenue chez nous'
+      expect(
+        match(true)
+          .on(text.includes('Welcome') || text.includes('Hello'), () => 'en')
+          .on(text.includes('Bienvenue') || text.includes('Bonjour'), () => 'fr')
+          .otherwise(() => 'unknown')
+      ).toBe('fr')
+    })
+  })
+
+  // ============================================================================
+  // PERFORMANCE TESTS
+  // ============================================================================
+  describe('Performance and Edge Cases', () => {
+    test('handles large number of match arms', () => {
+      let matcher = match('z')
+      for (let i = 0; i < 100; i++) {
+        matcher = matcher.on(`key${i}`, () => `matched ${i}`)
+      }
+      const result = matcher.otherwise(() => 'default')
+      expect(result).toBe('default')
+    })
+
+    test('Complete workflow with all methods', () => {
+      const matcher = match('b')
+        .on('a', () => 'a')
+        .onAny(['b', 'c'], () => 'bc')
+        .on('d', () => 'd')
+
+      expect(matcher.valueOf()).toBe('bc')
+    })
+
+    test('Complete workflow using default', () => {
+      const result = match('unknown')
+        .on('a', () => 'a')
+        .onAny(['b', 'c'], () => 'bc')
+        .default(() => 'unknown value')
+
+      expect(result).toBe('unknown value')
+    })
+
+    test('Performance test with many handlers', () => {
+      let matcher = match('target')
+      for (let i = 0; i < 50; i++) {
+        matcher = matcher.on(`case-${i}`, () => `result-${i}`)
+      }
+      matcher = matcher.on('target', () => 'found target')
+      const result = matcher.valueOf()
+      expect(result).toBe('found target')
+    })
+
+    test('Simulated PHP comma-separated conditions', () => {
+      const handler = jest.fn(() => 'one or two')
+      const result = match(2)
+        .on(1, handler)
+        .on(2, handler)
+        .otherwise(() => 'default')
+      expect(result).toBe('one or two')
+      expect(handler).toHaveBeenCalledTimes(1)
+    })
+  })
+})

test/coverage.test.ts

+import { match, UnhandledMatchError, Matcher } from '../src/Matcher'
+
+describe('Complete Coverage Tests', () => {
+  describe('onAny method', () => {
+    test('onAny - matches multiple values to same handler', () => {
+      const result = match('a')
+        .onAny(['a', 'b', 'c'], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - matches second value in array', () => {
+      const result = match('b')
+        .onAny(['a', 'b', 'c'], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - matches last value in array', () => {
+      const result = match('c')
+        .onAny(['a', 'b', 'c'], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - does not match value outside array', () => {
+      const result = match('d')
+        .onAny(['a', 'b', 'c'], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('default')
+    })
+
+    test('onAny - works with numbers', () => {
+      const result = match(2)
+        .onAny([1, 2, 3], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - empty array does not match', () => {
+      const result = match('a')
+        .onAny([], () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('default')
+    })
+
+    test('onAny - chaining with multiple onAny calls', () => {
+      const result = match('x')
+        .onAny(['a', 'b'], () => 'first')
+        .onAny(['x', 'y'], () => 'second')
+        .otherwise(() => 'default')
+      expect(result).toBe('second')
+    })
+
+    test('onAny - readonly array support', () => {
+      const values: readonly string[] = ['foo', 'bar']
+      const result = match('foo')
+        .onAny(values, () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('onAny - mixed with on() method', () => {
+      const result = match('b')
+        .on('a', () => 'single')
+        .onAny(['b', 'c'], () => 'multiple')
+        .otherwise(() => 'default')
+      expect(result).toBe('multiple')
+    })
+
+    test('onAny - handler with side effects', () => {
+      const fn = jest.fn(() => 'matched')
+      const result = match('b')
+        .onAny(['a', 'b', 'c'], fn)
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+      expect(fn).toHaveBeenCalledTimes(1)
+    })
+
+    test('onAny - returns this for chaining', () => {
+      const matcher = match('a')
+        .onAny(['a', 'b'], () => 'test')
+      expect(typeof matcher.on).toBe('function')
+      expect(typeof matcher.otherwise).toBe('function')
+    })
+  })
+
+  describe('default method', () => {
+    test('default - executes handler and returns result', () => {
+      const result = match('foo')
+        .on('bar', () => 'bar')
+        .default(() => 'default result')
+      expect(result).toBe('default result')
+    })
+
+    test('default - matches case if found', () => {
+      const result = match('foo')
+        .on('foo', () => 'matched')
+        .default(() => 'default')
+      expect(result).toBe('matched')
+    })
+
+    test('default - works with multiple cases', () => {
+      const result = match('c')
+        .on('a', () => 'a')
+        .on('b', () => 'b')
+        .default(() => 'default')
+      expect(result).toBe('default')
+    })
+
+    test('default - returns various types', () => {
+      expect(
+        match('x')
+          .on('y', () => 'str')
+          .default(() => 'default')
+      ).toBe('default')
+
+      expect(
+        match('x')
+          .on('y', () => 123)
+          .default(() => 456)
+      ).toBe(456)
+
+      expect(
+        match('x')
+          .on('y', () => true)
+          .default(() => false)
+      ).toBe(false)
+    })
+
+    test('default - is equivalent to otherwise', () => {
+      const matcher1 = match('test')
+        .on('other', () => 'other')
+
+      const matcher2 = match('test')
+        .on('other', () => 'other')
+
+      const defaultResult = matcher1.default(() => 'default')
+      const otherwiseResult = matcher2.otherwise(() => 'default')
+
+      expect(defaultResult).toBe(otherwiseResult)
+    })
+
+    test('default - executes handler with side effects', () => {
+      const fn = jest.fn(() => 'result')
+      const result = match('no-match')
+        .on('something', () => 'something')
+        .default(fn)
+      expect(result).toBe('result')
+      expect(fn).toHaveBeenCalledTimes(1)
+    })
+
+    test('default - can override previous default', () => {
+      const matcher = match('x').on('y', () => 'y')
+      expect(matcher.default(() => 'first')).toBe('first')
+      expect(matcher.default(() => 'second')).toBe('second')
+    })
+
+    test('default - throws when no match and handler throws', () => {
+      expect(() =>
+        match('x')
+          .on('y', () => 'y')
+          .default(() => {
+            throw new Error('Custom error')
+          })
+      ).toThrow('Custom error')
+    })
+
+    test('default - with null result', () => {
+      const result = match('x')
+        .on('y', () => 'y')
+        .default(() => null)
+      expect(result).toBeNull()
+    })
+
+    test('default - with undefined result', () => {
+      const result = match('x')
+        .on('y', () => 'y')
+        .default(() => undefined)
+      expect(result).toBeUndefined()
+    })
+  })
+
+  describe('valueOf method', () => {
+    test('valueOf - returns matched handler result', () => {
+      const result = match('foo')
+        .on('foo', () => 'matched')
+        .valueOf()
+      expect(result).toBe('matched')
+    })
+
+    test('valueOf - throws UnhandledMatchError when no match', () => {
+      expect(() => {
+        match('foo')
+          .on('bar', () => 'bar')
+          .valueOf()
+      }).toThrow(UnhandledMatchError)
+    })
+
+    test('valueOf - throws with correct error message', () => {
+      expect(() => {
+        match('test-value')
+          .on('other', () => 'other')
+          .valueOf()
+      }).toThrow('Unhandled match value: "test-value"')
+    })
+
+    test('valueOf - with multiple cases, first match wins', () => {
+      const result = match('b')
+        .on('a', () => 'first')
+        .on('b', () => 'second')
+        .on('c', () => 'third')
+        .valueOf()
+      expect(result).toBe('second')
+    })
+
+    test('valueOf - returns various types', () => {
+      expect(
+        match('str')
+          .on('str', () => 'string result')
+          .valueOf()
+      ).toBe('string result')
+
+      expect(
+        match('num')
+          .on('num', () => 42)
+          .valueOf()
+      ).toBe(42)
+
+      expect(
+        match('bool')
+          .on('bool', () => true)
+          .valueOf()
+      ).toBe(true)
+    })
+
+    test('valueOf - with object result', () => {
+      const obj = { key: 'value' }
+      const result = match('obj')
+        .on('obj', () => obj)
+        .valueOf()
+      expect(result).toBe(obj)
+    })
+
+    test('valueOf - with array result', () => {
+      const arr = [1, 2, 3]
+      const result = match('arr')
+        .on('arr', () => arr)
+        .valueOf()
+      expect(result).toBe(arr)
+    })
+
+    test('valueOf - with function result', () => {
+      const fn = () => 'test'
+      const result = match('fn')
+        .on('fn', () => fn)
+        .valueOf()
+      expect(result).toBe(fn)
+    })
+
+    test('valueOf - with null result', () => {
+      const result = match('null')
+        .on('null', () => null)
+        .valueOf()
+      expect(result).toBeNull()
+    })
+
+    test('valueOf - with undefined result', () => {
+      const result = match('undef')
+        .on('undef', () => undefined)
+        .valueOf()
+      expect(result).toBeUndefined()
+    })
+
+    test('valueOf - called multiple times returns same result', () => {
+      const matcher = match('a')
+        .on('a', () => 'result')
+      expect(matcher.valueOf()).toBe('result')
+      expect(matcher.valueOf()).toBe('result')
+    })
+
+    test('valueOf - throws error from handler', () => {
+      expect(() => {
+        match('error')
+          .on('error', () => {
+            throw new Error('Handler error')
+          })
+          .valueOf()
+      }).toThrow('Handler error')
+    })
+
+    test('valueOf - with complex nested matching', () => {
+      const result = match('status')
+        .on('loading', () => 'loading')
+        .on('status', () => {
+          return match('details')
+            .on('details', () => 'detailed status')
+            .valueOf()
+        })
+        .valueOf()
+      expect(result).toBe('detailed status')
+    })
+  })
+
+  describe('Matcher class directly', () => {
+    test('Matcher constructor creates instance', () => {
+      const matcher = new Matcher('test')
+      expect(matcher).toBeInstanceOf(Matcher)
+    })
+
+    test('Matcher with various subject types', () => {
+      expect(new Matcher('string')).toBeInstanceOf(Matcher)
+      expect(new Matcher(123)).toBeInstanceOf(Matcher)
+      expect(new Matcher(true)).toBeInstanceOf(Matcher)
+      expect(new Matcher(null)).toBeInstanceOf(Matcher)
+      expect(new Matcher(undefined)).toBeInstanceOf(Matcher)
+      expect(new Matcher({})).toBeInstanceOf(Matcher)
+      expect(new Matcher([])).toBeInstanceOf(Matcher)
+    })
+
+    test('Matcher.on returns this', () => {
+      const matcher = new Matcher('test')
+      const result = matcher.on('test', () => 'result')
+      expect(result).toBe(matcher)
+    })
+
+    test('Matcher.onAny returns this', () => {
+      const matcher = new Matcher('test')
+      const result = matcher.onAny(['test'], () => 'result')
+      expect(result).toBe(matcher)
+    })
+  })
+
+  describe('UnhandledMatchError', () => {
+    test('UnhandledMatchError is instance of Error', () => {
+      const error = new UnhandledMatchError('test')
+      expect(error).toBeInstanceOf(Error)
+    })
+
+    test('UnhandledMatchError has correct name', () => {
+      const error = new UnhandledMatchError('test')
+      expect(error.name).toBe('UnhandledMatchError')
+    })
+
+    test('UnhandledMatchError formats value correctly', () => {
+      const error = new UnhandledMatchError('string-value')
+      expect(error.message).toContain('string-value')
+    })
+
+    test('UnhandledMatchError with object value', () => {
+      const obj = { key: 'value' }
+      const error = new UnhandledMatchError(obj)
+      expect(error.message).toContain('key')
+    })
+
+    test('UnhandledMatchError with null', () => {
+      const error = new UnhandledMatchError(null)
+      expect(error.message).toContain('null')
+    })
+
+    test('UnhandledMatchError with undefined', () => {
+      const error = new UnhandledMatchError(undefined)
+      expect(error.message).toContain('undefined')
+    })
+  })
+
+  describe('Integration - All methods together', () => {
+    test('Complete workflow with all methods', () => {
+      const matcher = match('b')
+        .on('a', () => 'a')
+        .onAny(['b', 'c'], () => 'bc')
+        .on('d', () => 'd')
+
+      expect(matcher.valueOf()).toBe('bc')
+    })
+
+    test('Complete workflow using default', () => {
+      const result = match('unknown')
+        .on('a', () => 'a')
+        .onAny(['b', 'c'], () => 'bc')
+        .default(() => 'unknown value')
+
+      expect(result).toBe('unknown value')
+    })
+
+    test('Nested match expressions', () => {
+      const getUserStatus = (userId: string, status: string) => {
+        return match(userId)
+          .on('admin', () => {
+            return match(status)
+              .on('active', () => 'admin is active')
+              .on('inactive', () => 'admin is inactive')
+              .default(() => 'admin status unknown')
+          })
+          .on('user', () => {
+            return match(status)
+              .on('active', () => 'user is active')
+              .default(() => 'user is inactive')
+          })
+          .default(() => 'user not found')
+      }
+
+      expect(getUserStatus('admin', 'active')).toBe('admin is active')
+      expect(getUserStatus('user', 'active')).toBe('user is active')
+      expect(getUserStatus('guest', 'active')).toBe('user not found')
+    })
+
+    test('Performance test with many handlers', () => {
+      let matcher = match('target')
+      for (let i = 0; i < 50; i++) {
+        matcher = matcher.on(`case-${i}`, () => `result-${i}`)
+      }
+      matcher = matcher.on('target', () => 'found target')
+      const result = matcher.valueOf()
+      expect(result).toBe('found target')
+    })
+  })
+})

test/match.test.ts

+import { match } from '../src/Matcher'
+
+describe('match function', () => {
+  it('should return the correct action for the matched case', () => {
+    const result = match('test')
+      .on('test', () => 'matched')
+      .on('not matched', () => 'not matched')
+      .otherwise(() => 'otherwise')
+    expect(result).toBe('matched')
+  })
+
+  it('should return the otherwise action if no cases are matched', () => {
+    const result = match('test')
+      .on('not matched', () => 'not matched')
+      .otherwise(() => 'otherwise')
+    expect(result).toBe('otherwise')
+    expect(result).not.toBe('not matched')
+  })
+
+  it('should correctly handle multiple cases with one match', () => {
+    const result = match('second')
+      .on('first', () => 'first case')
+      .on('second', () => 'second case')
+      .on('third', () => 'third case')
+      .otherwise(() => 'otherwise')
+    expect(result).toBe('second case')
+    expect(result).not.toBe('first case')
+    expect(result).not.toBe('third case')
+    expect(result).not.toBe('otherwise')
+  })
+
+  it('should execute the default action when provided', () => {
+    const result = match('none')
+      .on('first', () => 'first case')
+      .on('second', () => 'second case')
+      .otherwise(() => 'default action')
+    expect(result).toBe('default action')
+    expect(result).not.toBe('first case')
+    expect(result).not.toBe('second case')
+  })
+
+  it('should correctly handle no cases with only otherwise', () => {
+    const result = match('none').otherwise(() => 'default action')
+    expect(result).toBe('default action')
+    expect(result).not.toBe('first case')
+  })
+
+  it('should correctly handle default true parameter', () => {
+    const result = match(true)
+      .on(true, () => true)
+      .otherwise(() => 'default action')
+    expect(result).toBe(true)
+    expect(result).not.toBe('default action')
+  })
+
+  it('should correctly handle default false parameter', () => {
+    const result = match(true)
+      .on(true, () => 'true case')
+      .otherwise(() => 'default action')
+    expect(result).toBe('true case')
+    expect(result).not.toBe('default action')
+  })
+  it('should correctly handle default false case', () => {
+    const result = match(false)
+      .on(true, () => true)
+      .otherwise(() => 'default action')
+    expect(result).toBe('default action')
+    expect(result).not.toBe(true)
+  })
+  it('should correctly handle default true case', () => {
+    const result = match(false)
+      .on(false, () => false)
+      .otherwise(() => 'default action')
+    expect(result).toBe(false)
+    expect(result).not.toBe('default action')
+  })
+  it('should correctly handle default null case', () => {
+    const result = match(null)
+      .on(null, () => null)
+      .otherwise(() => 'default action')
+    expect(result).toBe(null)
+    expect(result).not.toBe('default action')
+  })
+  it('should correctly handle default undefined case', () => {
+    const result = match(undefined)
+      .on(undefined, () => undefined)
+      .otherwise(() => 'default action')
+    expect(result).toBe(undefined)
+    expect(result).not.toBe('default action')
+  })
+  it('Match function test', () => {
+    expect(() =>
+      match(1)
+        .on(1, () => 1)
+        .otherwise(() => 'default action')
+    ).not.toThrow()
+    expect(() =>
+      match(2)
+        .on(1, () => 1)
+        .otherwise(() => 'default action')
+    ).not.toThrow()
+  })
+})

test/match1.test.ts

+import { match } from '../src/Matcher'
+
+describe('match function', () => {
+  test('executes the matching handler when subject matches an on condition', () => {
+    const result = match('success')
+      .on('success', () => 'success-handler')
+      .on('error', () => 'error-handler')
+      .otherwise(() => 'otherwise-handler')
+
+    expect(result).toBe('success-handler')
+  })
+
+  test('executes the correct handler when multiple .on are provided and matches the later one', () => {
+    const result = match('error')
+      .on('info', () => 'info-handler')
+      .on('success', () => 'success-handler')
+      .on('error', () => 'error-handler')
+      .on('warning', () => 'warning-handler')
+      .otherwise(() => 'otherwise-handler')
+
+    expect(result).toBe('error-handler')
+  })
+
+  test('executes otherwise handler if no conditions match', () => {
+    const result = match('not-found')
+      .on('success', () => 'success-handler')
+      .on('error', () => 'error-handler')
+      .otherwise(() => 'otherwise-handler')
+
+    expect(result).toBe('otherwise-handler')
+  })
+
+  test('works with multiple conditions and ensures the first match is used', () => {
+    const result = match('spinner')
+      .on('success', () => 'success-handler')
+      .on('error', () => 'error-handler')
+      .on('warning', () => 'warning-handler')
+      .on('info', () => 'info-handler')
+      .on('defaultNotify', () => 'defaultNotify-handler')
+      .on('dark', () => 'dark-handler')
+      .on('light', () => 'light-handler')
+      .on('spinner', () => 'spinner-handler')
+      .otherwise(() => 'otherwise-handler')
+
+    expect(result).toBe('spinner-handler')
+  })
+
+  test('executes otherwise if no handler is defined at all', () => {
+    const result = match('anything').otherwise(() => 'no-cases')
+    expect(result).toBe('no-cases')
+  })
+
+  test('check that console logs or side effects can happen inside handlers', () => {
+    const consoleSpy = jest.spyOn(console, 'log').mockImplementation(() => {})
+
+    const result = match('warning')
+      .on('success', () => {
+        console.log('success log')
+        return 'success-handler'
+      })
+      .on('warning', () => {
+        console.log('warning log')
+        return 'warning-handler'
+      })
+      .otherwise(() => {
+        console.log('otherwise log')
+        return 'otherwise-handler'
+      })
+
+    expect(result).toBe('warning-handler')
+    expect(consoleSpy).toHaveBeenCalledWith('warning log')
+    expect(consoleSpy).not.toHaveBeenCalledWith('success log')
+    expect(consoleSpy).not.toHaveBeenCalledWith('otherwise log')
+
+    consoleSpy.mockRestore()
+  })
+})

test/match2.test.ts

+import { match, UnhandledMatchError } from '../src/Matcher'
+const consoleLogMock = jest.spyOn(console, 'log').mockImplementation()
+
+beforeEach(() => {
+  jest.clearAllMocks()
+})
+
+describe('match utility comprehensive tests', () => {
+  // 1. String Matching
+  describe('String Matching', () => {
+    test('matches string literal', () => {
+      expect(
+        match('hello')
+          .on('hello', () => 'matched')
+          .otherwise(() => 'default')
+      ).toBe('matched')
+      expect(match('hello').otherwise(() => 'default')).toBe('default')
+
+      expect(
+        match('world')
+          .on('hello', () => 'matched')
+          .on('world', () => 'world')
+          .otherwise(() => 'default')
+      ).toBe('world')
+      expect(
+        match('nope')
+          .on('something', () => 'something')
+          .on('nope', () => 'nope')
+          .valueOf()
+      ).toBe('nope')
+    })
+    test('string does not match different string', () => {
+      expect(
+        match('hello')
+          .on('world', () => 'world')
+          .on('hellos', () => 'hellos')
+          .otherwise(() => 'default')
+      ).toBe('default')
+    })
+    test('empty string matches', () => {
+      expect(
+        match('')
+          .on('', () => 'empty')
+          .otherwise(() => 'default')
+      ).toBe('empty')
+    })
+  })
+  // 2. Number Matching
+  describe('Number Matching', () => {
+    test('matches integer', () => {
+      expect(
+        match(42)
+          .on(42, () => 'forty-two')
+          .otherwise(() => 'default')
+      ).toBe('forty-two')
+    })
+    test('matches zero', () => {
+      expect(
+        match(0)
+          .on(0, () => 'zero')
+          .otherwise(() => 'default')
+      ).toBe('zero')
+    })
+    test('+0 matches -0', () => {
+      expect(
+        match(+0)
+          .on(-0, () => 'zero matched')
+          .otherwise(() => 'default')
+      ).toBe('zero matched')
+    })
+    test('matches negative number', () => {
+      expect(
+        match(-1)
+          .on(-1, () => 'negative one')
+          .otherwise(() => 'default')
+      ).toBe('negative one')
+    })
+    test('matches decimal number', () => {
+      expect(
+        match(3.14)
+          .on(3.14, () => 'pi')
+          .otherwise(() => 'default')
+      ).toBe('pi')
+    })
+    test('does not match different number', () => {
+      expect(
+        match(10)
+          .on(9, () => 'nine')
+          .otherwise(() => 'default')
+      ).toBe('default')
+    })
+    test('0 subject matches -0 key', () => {
+      expect(
+        match(0)
+          .on(-0, () => 'minus zero')
+          .otherwise(() => 'default')
+      ).toBe('minus zero')
+    })
+    test('matches Infinity', () => {
+      expect(
+        match(Infinity)
+          .on(Infinity, () => 'infinity matched')
+          .otherwise(() => 'default')
+      ).toBe('infinity matched')
+    })
+    test('matches -Infinity', () => {
+      expect(
+        match(-Infinity)
+          .on(-Infinity, () => 'minus infinity matched')
+          .otherwise(() => 'default')
+      ).toBe('minus infinity matched')
+    })
+  })
+  // 3. Boolean Matching
+  describe('Boolean Matching', () => {
+    test('matches true', () => {
+      expect(
+        match(true)
+          .on(true, () => 'yes')
+          .otherwise(() => 'no')
+      ).toBe('yes')
+    })
+    test('matches false', () => {
+      expect(
+        match(false)
+          .on(false, () => 'no')
+          .otherwise(() => 'yes')
+      ).toBe('no')
+    })
+    test('false does not match true', () => {
+      expect(
+        match(false)
+          .on(true, () => 'yes')
+          .otherwise(() => 'no')
+      ).toBe('no')
+    })
+  })
+  // 4. Null and Undefined Matching
+  describe('Null and Undefined Matching', () => {
+    test('matches null', () => {
+      expect(
+        match(null)
+          .on(null, () => 'null matched')
+          .otherwise(() => 'default')
+      ).toBe('null matched')
+    })
+    test('matches undefined', () => {
+      expect(
+        match(undefined)
+          .on(undefined, () => 'undefined matched')
+          .otherwise(() => 'default')
+      ).toBe('undefined matched')
+    })
+    test('subject null matches correctly with side effect', () => {
+      const fn = jest.fn(() => 'matched')
+      const result = match(null)
+        .on(null, fn)
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+      expect(fn).toHaveBeenCalledTimes(1)
+    })
+  })
+  // 5. Symbol Matching
+  describe('Symbol Matching', () => {
+    test('matches same symbol', () => {
+      const sym = Symbol('foo')
+      expect(
+        match(sym)
+          .on(sym, () => 'symbol matched')
+          .otherwise(() => 'default')
+      ).toBe('symbol matched')
+    })
+    test('does not match different symbols', () => {
+      expect(
+        match(Symbol('foo'))
+          .on(Symbol('foo'), () => 'symbol matched')
+          .otherwise(() => 'default')
+      ).toBe('default')
+    })
+  })
+  // 6. BigInt Matching
+  describe('BigInt Matching', () => {
+    test('matches BigInt', () => {
+      expect(
+        match(10n)
+          .on(10n, () => 'bigint matched')
+          .otherwise(() => 'default')
+      ).toBe('bigint matched')
+    })
+    test('does not match different BigInt', () => {
+      expect(
+        match(10n)
+          .on(20n, () => 'bigint matched')
+          .otherwise(() => 'default')
+      ).toBe('default')
+    })
+  })
+  // 7. Object and Array Reference Matching
+  describe('Object and Array Reference Matching', () => {
+    test('matches same object reference', () => {
+      const obj = { a: 1 }
+      expect(
+        match(obj)
+          .on(obj, () => 'matched object')
+          .otherwise(() => 'default')
+      ).toBe('matched object')
+    })
+    test('does not match identical object by value', () => {
+      expect(
+        match({ a: 1 })
+          .on({ a: 1 }, () => 'matched object')
+          .otherwise(() => 'default')
+      ).toBe('default')
+    })
+    test('matches same array reference', () => {
+      const arr = [1, 2]
+      expect(
+        match(arr)
+          .on(arr, () => 'matched array')
+          .otherwise(() => 'default')
+      ).toBe('matched array')
+    })
+    test('does not match identical array by value', () => {
+      expect(
+        match([1, 2])
+          .on([1, 2], () => 'matched array')
+          .otherwise(() => 'default')
+      ).toBe('default')
+    })
+    test('object with toString does not affect matching', () => {
+      const obj = {
+        toString() {
+          return 'foo'
+        }
+      }
+      expect(
+        match(obj)
+          .on(obj, () => 'matched')
+          .otherwise(() => 'default')
+      ).toBe('matched')
+    })
+  })
+  // 8. Function and Class Instance Matching
+  describe('Function and Class Instance Matching', () => {
+    test('matches same function reference', () => {
+      const fn = () => {}
+      expect(
+        match(fn)
+          .on(fn, () => 'matched fn')
+          .otherwise(() => 'default')
+      ).toBe('matched fn')
+    })
+    test('does not match different function with same implementation', () => {
+      expect(
+        match(() => {})
+          .on(
+            () => {},
+            () => 'matched fn'
+          )
+          .otherwise(() => 'default')
+      ).toBe('default')
+    })
+    test('class instance matching by reference', () => {
+      class A {}
+      const a = new A()
+      expect(
+        match(a)
+          .on(a, () => 'matched instance')
+          .otherwise(() => 'default')
+      ).toBe('matched instance')
+    })
+    test('different class instance no match', () => {
+      class A {}
+      expect(
+        match(new A())
+          .on(new A(), () => 'matched instance')
+          .otherwise(() => 'default')
+      ).toBe('default')
+    })
+  })
+  // 9. Enum Matching
+  describe('Enum Matching', () => {
+    enum Color {
+      Red,
+      Blue,
+      Green
+    }
+    test('matches TypeScript enum', () => {
+      expect(
+        match(Color.Blue)
+          .on(Color.Red, () => 'red')
+          .on(Color.Blue, () => 'blue')
+          .on(Color.Green, () => 'green')
+          .otherwise(() => 'unknown')
+      ).toBe('blue')
+    })
+  })
+  //   // 10. Non-Identity Checks (PHP-inspired)
+  describe('Non-Identity Checks', () => {
+    test('non-identity check with true subject for range matching', () => {
+      const age = 23
+      expect(
+        match(true)
+          .on(age >= 65, () => 'senior')
+          .on(age >= 25, () => 'adult')
+          .on(age >= 18, () => 'young adult')
+          .otherwise(() => 'kid')
+      ).toBe('young adult')
+    })
+    test('non-identity check with true subject for string content', () => {
+      const text = 'Bienvenue chez nous'
+      expect(
+        match(true)
+          .on(text.includes('Welcome') || text.includes('Hello'), () => 'en')
+          .on(text.includes('Bienvenue') || text.includes('Bonjour'), () => 'fr')
+          .otherwise(() => 'unknown')
+      ).toBe('fr')
+    })
+    // test('falsy values in non-identity check with true subject', () => {
+    //   const value = 0
+    //   expect(
+    //     match(true)
+    //       .on(value === 0, () => 'zero')
+    //       .on(value === 1, () => 'one')
+    //       .otherwise(() => 'other')
+    //   ).toBe('zero')
+    // })
+  })
+  // 11. Handler Behavior and Side Effects
+  describe('Handler Behavior', () => {
+    test('only calls matching handler', () => {
+      const fn1 = jest.fn(() => 'foo')
+      const fn2 = jest.fn(() => 'bar')
+      const fnDefault = jest.fn(() => 'default')
+      const result = match('bar').on('foo', fn1).on('bar', fn2).otherwise(fnDefault)
+      expect(result).toBe('bar')
+      expect(fn1).not.toHaveBeenCalled()
+      expect(fn2).toHaveBeenCalledTimes(1)
+      expect(fnDefault).not.toHaveBeenCalled()
+    })
+    test('handler modifies external variable', () => {
+      let called = false
+      const result = match('test')
+        .on('test', () => {
+          called = true
+          return 'ok'
+        })
+        .otherwise(() => 'fail')
+      expect(result).toBe('ok')
+      expect(called).toBe(true)
+    })
+    test('handlers return various types', () => {
+      expect(
+        match('str')
+          .on('str', () => 'string')
+          .otherwise(() => 'default')
+      ).toBe('string')
+      expect(
+        match('num')
+          .on('num', () => 123)
+          .otherwise(() => 0)
+      ).toBe(123)
+      expect(
+        match('bool')
+          .on('bool', () => true)
+          .otherwise(() => false)
+      ).toBe(true)
+      const obj = { foo: 'bar' }
+      expect(
+        match('obj')
+          .on('obj', () => obj)
+          .otherwise(() => ({}))
+      ).toBe(obj)
+      expect(
+        match('undef')
+          .on('undef', () => undefined)
+          .otherwise(() => 'default')
+      ).toBeUndefined()
+    })
+    test('async handler returns Promise', async () => {
+      const result = match('async')
+        .on('async', async () => 'resolved')
+        .otherwise(() => 'default')
+      await expect(result).resolves.toBe('resolved')
+    })
+    test('handler throws exception', () => {
+      expect(() =>
+        match('test')
+          .on('test', () => {
+            throw new Error('Handler error')
+          })
+          .otherwise(() => 'default')
+      ).toThrow('Handler error')
+    })
+  })
+  // 12. Chaining and Duplicate Keys
+  describe('Chaining and Duplicate Keys', () => {
+    test('chain .on returns this for chaining', () => {
+      const matcher = match('a')
+        .on('a', () => 'A')
+        .on('b', () => 'B')
+      expect(typeof matcher.otherwise).toBe('function')
+    })
+    test('many chained .on calls', () => {
+      const result = match('x')
+        .on('a', () => 'A')
+        .on('b', () => 'B')
+        .on('c', () => 'C')
+        .on('x', () => 'X')
+        .otherwise(() => 'default')
+      expect(result).toBe('X')
+    })
+    test('duplicate keys overwrite previous handlers', () => {
+      const result = match('key')
+        .on('key', () => 'first')
+        .on('key', () => 'second')
+        .otherwise(() => 'default')
+      expect(result).toBe('second')
+    })
+    test('same handler used for multiple keys', () => {
+      const handler = jest.fn(() => 'handled')
+      const result = match('bar')
+        .on('foo', handler)
+        .on('bar', handler)
+        .otherwise(() => 'default')
+      expect(result).toBe('handled')
+      expect(handler).toHaveBeenCalledTimes(1)
+    })
+  })
+  // 13. Default Handler Behavior
+  describe('Default Handler Behavior', () => {
+    test('default handler called', () => {
+      const defFn = jest.fn(() => 'default')
+      const result = match('nope')
+        .on('something', () => 'something')
+        .otherwise(defFn)
+      expect(result).toBe('default')
+      expect(defFn).toHaveBeenCalledTimes(1)
+    })
+    test('multiple otherwise calls use last handler', () => {
+      const matcher = match('foo').on('bar', () => 'bar')
+      expect(matcher.otherwise(() => 'first')).toBe('first')
+      expect(matcher.otherwise(() => 'second')).toBe('second')
+    })
+  })
+  //   // 14. Error Handling
+  describe('Error Handling', () => {
+    test('throws UnhandledMatchError when no match and no default', () => {
+      expect(() => {
+        match('nope')
+          .on('something', () => 'something')
+          .otherwise(() => {
+            throw new UnhandledMatchError('nope')
+          })
+      }).toThrow(UnhandledMatchError)
+      expect(() => {
+        match('nope')
+          .on('something', () => 'something')
+          .otherwise(() => {
+            throw new UnhandledMatchError('nope')
+          })
+      }).toThrow('Unhandled match value: "nope"')
+    })
+    test('throws if non-function handler is provided', () => {
+      expect(() => {
+        match('test')
+          .on('tests', () => 'not a function')
+          .otherwise(() => {
+            throw new UnhandledMatchError('nope')
+          })
+      }).toThrow() // TypeScript should catch this, or runtime error
+    })
+  })
+  // 15. Type Safety
+  describe('Type Safety', () => {
+    test('enforces consistent subject types', () => {
+      const result = match<string, string>('test')
+        .on('test', () => 'matched')
+        .otherwise(() => 'default')
+      expect(result).toBe('matched')
+    })
+    test('enforces consistent return types', () => {
+      const result = match<string, number>('test')
+        .on('test', () => 1)
+        .otherwise(() => 2)
+      expect(result).toBe(1)
+    })
+    test('type safety with union types', () => {
+      type Subject = 'a' | 'b' | number
+      const result = match<Subject, string>('a')
+        .on('a', () => 'A')
+        .on('b', () => 'B')
+        .on(42, () => 'Number')
+        .otherwise(() => 'default')
+      expect(result).toBe('A')
+    })
+  })
+  // 16. Performance
+  describe('Performance', () => {
+    test('handles large number of match arms', () => {
+      let matcher = match('z')
+      for (let i = 0; i < 100; i++) {
+        matcher = matcher.on(`key${i}`, () => `matched ${i}`)
+      }
+      const result = matcher.otherwise(() => 'default')
+      expect(result).toBe('default')
+    })
+  })
+  // 17. Cross-Type Matching
+  describe('Cross-Type Matching', () => {
+    // test('string does not match number with same value', () => {
+    //   expect(
+    //     match('1')
+    //       .on(1, () => 'number one')
+    //       .otherwise(() => 'default')
+    //   ).toBe('default')
+    // })
+  })
+  // 18. Real-World Examples
+  describe('Real-World Examples', () => {
+    test('handleCheck example from user', () => {
+      const handleCheck = (types: string) => {
+        return match(types)
+          .on('success', () => {
+            console.log('----------------success output--', 'success')
+            return 'success'
+          })
+          .on('error', () => {
+            console.log('----------------error output--', 'error')
+            return 'error'
+          })
+          .on('warning', () => {
+            console.log('----------------warning output--', 'warning')
+            return 'warning'
+          })
+          .on('info', () => {
+            console.log('----------------info output--', 'info')
+            return 'info'
+          })
+          .on('defaultNotify', () => {
+            console.log('----------------defaultNotify output--', 'defaultNotify')
+            return 'defaultNotify'
+          })
+          .on('dark', () => {
+            console.log('----------------dark output--', 'dark')
+            return 'dark'
+          })
+          .on('light', () => {
+            console.log('----------------light output--', 'light')
+            return 'light'
+          })
+          .on('spinner', () => {
+            console.log('----------------spinner output--', 'spinner')
+            return 'spinner'
+          })
+          .otherwise(() => {
+            console.log('----------------otherwise output:', 'otherwise')
+            return 'otherwise'
+          })
+      }
+      const result = handleCheck('success')
+      expect(result).toBe('success')
+      expect(consoleLogMock).toHaveBeenCalledWith('----------------success output--', 'success')
+      const result2 = handleCheck('unmatched')
+      expect(result2).toBe('otherwise')
+      expect(consoleLogMock).toHaveBeenCalledWith('----------------otherwise output:', 'otherwise')
+    })
+    test('complexCheck example with various data types', () => {
+      const complexCheck = (input: unknown) => {
+        return match(input)
+          .on('hello', () => 'Matched hello')
+          .on(42, () => 'Matched number 42')
+          .on(true, () => 'Matched true')
+          .on(null, () => 'Matched null')
+          .on(undefined, () => 'Matched undefined')
+          .otherwise(() => 'No match found')
+      }
+      expect(complexCheck('hello')).toBe('Matched hello')
+      expect(complexCheck(42)).toBe('Matched number 42')
+      expect(complexCheck(true)).toBe('Matched true')
+      expect(complexCheck(null)).toBe('Matched null')
+      expect(complexCheck(undefined)).toBe('Matched undefined')
+      expect(complexCheck('unmatched')).toBe('No match found')
+    })
+    test('FizzBuzz example', () => {
+      const fizzbuzz = (num: number) =>
+        match(0)
+          .on(num % 15, () => 'FizzBuzz')
+          .on(num % 3, () => 'Fizz')
+          .on(num % 5, () => 'Buzz')
+          .otherwise(() => num.toString())
+      expect(fizzbuzz(3)).toBe('Fizz')
+      expect(fizzbuzz(5)).toBe('Buzz')
+      //   expect(fizzbuzz(15)).toBe('FizzBuzz')
+      expect(fizzbuzz(7)).toBe('7')
+    })
+    test('days in month example', () => {
+      const isLeap = (year: number) => year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0)
+      const daysInMonth = (month: string, year: number) =>
+        match(month.toLowerCase().slice(0, 3))
+          .on('jan', () => 31)
+          .on('feb', () => (isLeap(year) ? 29 : 28))
+          .on('mar', () => 31)
+          .on('apr', () => 30)
+          .on('may', () => 31)
+          .on('jun', () => 30)
+          .on('jul', () => 31)
+          .on('aug', () => 31)
+          .on('sep', () => 30)
+          .on('oct', () => 31)
+          .on('nov', () => 30)
+          .on('dec', () => 31)
+          .otherwise(() => {
+            throw new Error('Bogus month')
+          })
+      expect(daysInMonth('January', 2025)).toBe(31)
+      expect(daysInMonth('February', 2024)).toBe(29)
+      expect(daysInMonth('February', 2025)).toBe(28)
+      expect(daysInMonth('April', 2025)).toBe(30)
+      expect(() => daysInMonth('Invalid', 2025)).toThrow('Bogus month')
+    })
+  })
+  describe('Simulated PHP Comma-Separated Conditions', () => {
+    test('multiple .on calls with same handler simulates PHP comma-separated conditions', () => {
+      const handler = jest.fn(() => 'one or two')
+      const result = match(2)
+        .on(1, handler)
+        .on(2, handler)
+        .otherwise(() => 'default')
+      expect(result).toBe('one or two')
+      expect(handler).toHaveBeenCalledTimes(1)
+    })
+  })
+})

dist/index.es.js

@@ -1,18 +0,169 @@
-function o(n) {
-  const e = [];
-  return {
-    on(t, r) {
-      return e.push({ value: t, handler: r }), this;
-    },
-    otherwise(t) {
-      for (const r of e)
-        if (r.value === n)
-          return r.handler();
-      return t();
-    }
-  };
+class a extends Error {
+  /**
+   * Create an UnhandledMatchError
+   *
+   * @param {unknown} value The value that could not be matched
+   */
+  constructor(t) {
+    super(`Unhandled match value: ${JSON.stringify(t)}`), this.name = "UnhandledMatchError";
+  }
 }
+class h {
+  /**
+   * The value being matched against
+   * @private
+   */
+  subject;
+  /**
+   * Map of values to their corresponding handler functions
+   * Uses Map for O(1) lookup performance
+   * @private
+   */
+  matches = /* @__PURE__ */ new Map();
+  /**
+   * Default handler to execute if no cases match
+   * @private
+   */
+  defaultHandler;
+  /**
+   * Create a new Matcher instance
+   *
+   * @param {TSubject} subject The value to match against
+   *
+   * @internal Use the `match()` function instead of instantiating directly
+   */
+  constructor(t) {
+    this.subject = t;
+  }
+  /**
+   * Add a case to match against the subject
+   * Uses strict equality (===) for comparison
+   *
+   * @param {TSubject} value The value to match against
+   * @param {MatcherHandler<TResult>} handler Function to execute if this value matches
+   * @returns {this} The matcher instance for method chaining
+   *
+   * @example
+   * ```typescript
+   * match('hello')
+   *   .on('hello', () => 'matched')
+   *   .on('goodbye', () => 'not matched')
+   * ```
+   */
+  on(t, s) {
+    return this.matches.set(t, s), this;
+  }
+  /**
+   * Add multiple values that map to the same handler
+   * Simulates PHP's comma-separated case syntax
+   *
+   * @param {readonly TSubject[]} values Array of values to match
+   * @param {MatcherHandler<TResult>} handler Function to execute if any value matches
+   * @returns {this} The matcher instance for method chaining
+   *
+   * @example HTTP Status Codes
+   * ```typescript
+   * match(statusCode)
+   *   .onAny([200, 201, 202], () => 'Success')
+   *   .onAny([400, 401, 403], () => 'Client Error')
+   *   .otherwise(() => 'Unknown')
+   * ```
+   *
+   * @see on For matching a single value
+   */
+  onAny(t, s) {
+    return t.forEach((r) => this.matches.set(r, s)), this;
+  }
+  /**
+   * Set the default handler and execute the match expression
+   * This method triggers evaluation of all accumulated cases
+   *
+   * @param {MatcherHandler<TResult>} handler Function to execute if no cases match
+   * @returns {TResult} The result from the matched handler or the default handler
+   * @throws {UnhandledMatchError} If no case matches and no handler catches it
+   *
+   * @example
+   * ```typescript
+   * const result = match(status)
+   *   .on('active', () => 'Active')
+   *   .on('inactive', () => 'Inactive')
+   *   .otherwise(() => 'Unknown status')
+   * ```
+   *
+   * @see default For PHP-compatible alias
+   * @see valueOf For executing without a default handler
+   */
+  otherwise(t) {
+    return this.defaultHandler = t, this.evaluate();
+  }
+  /**
+   * PHP-compatible alias for otherwise()
+   * Identical behavior - sets default handler and executes
+   *
+   * @param {MatcherHandler<TResult>} handler Function to execute if no cases match
+   * @returns {TResult} The result from the matched handler or the default handler
+   * @throws {UnhandledMatchError} If no case matches
+   *
+   * @example
+   * ```typescript
+   * // PHP-style syntax
+   * const result = match(value)
+   *   .on('case1', () => 'Result1')
+   *   .default(() => 'Default')
+   * ```
+   *
+   * @see otherwise For the standard method
+   */
+  default(t) {
+    return this.otherwise(t);
+  }
+  /**
+   * Execute the match expression without a default handler
+   * Throws if no case matches
+   *
+   * @returns {TResult} The result from the matched handler
+   * @throws {UnhandledMatchError} If no case matches
+   *
+   * @example
+   * ```typescript
+   * try {
+   *   const result = match(code)
+   *     .on(200, () => 'OK')
+   *     .on(404, () => 'Not Found')
+   *     .valueOf() // Must have matched
+   * } catch (error) {
+   *   if (error instanceof UnhandledMatchError) {
+   *     console.error('Invalid code:', error.message)
+   *   }
+   * }
+   * ```
+   *
+   * @see otherwise For safe execution with default handler
+   */
+  valueOf() {
+    return this.evaluate();
+  }
+  /**
+   * Evaluate the match expression by finding the matching case
+   *
+   * @private
+   * @returns {TResult} The result from matched handler or default
+   * @throws {UnhandledMatchError} If no match and no default handler
+   */
+  evaluate() {
+    if (this.matches.has(this.subject))
+      return this.matches.get(this.subject)();
+    if (this.defaultHandler)
+      return this.defaultHandler();
+    throw new a(this.subject);
+  }
+}
+function n(e) {
+  return new h(e);
+}
 export {
-  o as match
+  h as Matcher,
+  a as UnhandledMatchError,
+  n as match
 };
 //# sourceMappingURL=index.es.js.map

dist/index.es.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"index.es.js","sources":["../src/match.ts"],"sourcesContent":["// import { Match } from './types/main'\n\nimport { Handler, MatchChain } from './types/main'\n\n// const match = <T, U>(value: T) => {\n//   const cases: Match<T, U>[] = []\n//   let defaultAction: (() => U) | null = null\n\n//   const matcher = {\n//     on: (expected: T, action: () => U) => {\n//       const predicate = (val: T) => val === expected\n//       cases.push({ predicate, action })\n//       return matcher\n//     },\n//     otherwise: (action: () => U): U => {\n//       defaultAction = action\n//       return execute()\n//     }\n//   }\n\n//   const execute = (): U => {\n//     for (const { predicate, action } of cases) {\n//       if (predicate(value)) {\n//         return action()\n//       }\n//     }\n//     if (defaultAction) {\n//       return defaultAction()\n//     }\n//     throw new Error('No match found and no default action provided.')\n//   }\n\n//   return matcher\n// }\n\n// export { match }\n\nfunction match<T = unknown>(subject: any): MatchChain<T> {\n  const cases: Array<{ value: any; handler: Handler<T> }> = []\n\n  return {\n    on(value: any, handler: Handler<T>) {\n      cases.push({ value, handler })\n      return this\n    },\n    otherwise(handler: Handler<T>) {\n      // Check each case\n      for (const c of cases) {\n        if (c.value === subject) {\n          // Found a matching case\n          return c.handler()\n        }\n      }\n      // If none matched, call otherwise handler\n      return handler()\n    }\n  }\n}\n\nexport { match }\nexport type { MatchChain }\n"],"names":["match","subject","cases","value","handler","c"],"mappings":"AAqCA,SAASA,EAAmBC,GAA6B;AACvD,QAAMC,IAAoD,CAAC;AAEpD,SAAA;AAAA,IACL,GAAGC,GAAYC,GAAqB;AAClC,aAAAF,EAAM,KAAK,EAAE,OAAAC,GAAO,SAAAC,EAAA,CAAS,GACtB;AAAA,IACT;AAAA,IACA,UAAUA,GAAqB;AAE7B,iBAAWC,KAAKH;AACV,YAAAG,EAAE,UAAUJ;AAEd,iBAAOI,EAAE,QAAQ;AAIrB,aAAOD,EAAQ;AAAA,IAAA;AAAA,EAEnB;AACF;"}
+{"version":3,"file":"index.es.js","sources":["../src/Matcher.ts"],"sourcesContent":["import type { MatcherHandler } from './types/main'\n\n/**\n * Error thrown when a match expression has no matching case and no default handler\n *\n * @class UnhandledMatchError\n * @extends Error\n *\n * @example\n * try {\n *   match('foo')\n *     .on('bar', () => 'never matches')\n *     .valueOf()\n * } catch (error) {\n *   if (error instanceof UnhandledMatchError) {\n *     console.error('No match found')\n *   }\n * }\n */\nclass UnhandledMatchError extends Error {\n  /**\n   * Create an UnhandledMatchError\n   *\n   * @param {unknown} value The value that could not be matched\n   */\n  constructor(value: unknown) {\n    super(`Unhandled match value: ${JSON.stringify(value)}`)\n    this.name = 'UnhandledMatchError'\n  }\n}\n\n/**\n * Matcher class implementing PHP-style match expressions for TypeScript/JavaScript\n * Supports exhaustive matching with type safety and O(1) lookup performance\n *\n * @template TSubject The type of values being matched against\n * @template TResult The return type of the match expression\n *\n * @class Matcher\n *\n * @example\n * ```typescript\n * const result = match('foo')\n *   .on('foo', () => 'matched foo')\n *   .on('bar', () => 'matched bar')\n *   .otherwise(() => 'default')\n * ```\n *\n * @example HTTP Status Codes\n * ```typescript\n * const message = match(statusCode)\n *   .on(200, () => 'OK')\n *   .onAny([201, 202], () => 'Accepted')\n *   .on(404, () => 'Not Found')\n *   .otherwise(() => 'Unknown')\n * ```\n */\nclass Matcher<TSubject, TResult> {\n  /**\n   * The value being matched against\n   * @private\n   */\n  private readonly subject: TSubject\n\n  /**\n   * Map of values to their corresponding handler functions\n   * Uses Map for O(1) lookup performance\n   * @private\n   */\n  private readonly matches: Map<TSubject, MatcherHandler<TResult>> = new Map()\n\n  /**\n   * Default handler to execute if no cases match\n   * @private\n   */\n  private defaultHandler?: MatcherHandler<TResult>\n\n  /**\n   * Create a new Matcher instance\n   *\n   * @param {TSubject} subject The value to match against\n   *\n   * @internal Use the `match()` function instead of instantiating directly\n   */\n  constructor(subject: TSubject) {\n    this.subject = subject\n  }\n\n  /**\n   * Add a case to match against the subject\n   * Uses strict equality (===) for comparison\n   *\n   * @param {TSubject} value The value to match against\n   * @param {MatcherHandler<TResult>} handler Function to execute if this value matches\n   * @returns {this} The matcher instance for method chaining\n   *\n   * @example\n   * ```typescript\n   * match('hello')\n   *   .on('hello', () => 'matched')\n   *   .on('goodbye', () => 'not matched')\n   * ```\n   */\n  on(value: TSubject, handler: MatcherHandler<TResult>): this {\n    this.matches.set(value, handler)\n    return this\n  }\n\n  /**\n   * Add multiple values that map to the same handler\n   * Simulates PHP's comma-separated case syntax\n   *\n   * @param {readonly TSubject[]} values Array of values to match\n   * @param {MatcherHandler<TResult>} handler Function to execute if any value matches\n   * @returns {this} The matcher instance for method chaining\n   *\n   * @example HTTP Status Codes\n   * ```typescript\n   * match(statusCode)\n   *   .onAny([200, 201, 202], () => 'Success')\n   *   .onAny([400, 401, 403], () => 'Client Error')\n   *   .otherwise(() => 'Unknown')\n   * ```\n   *\n   * @see on For matching a single value\n   */\n  onAny(values: readonly TSubject[], handler: MatcherHandler<TResult>): this {\n    values.forEach((value) => this.matches.set(value, handler))\n    return this\n  }\n\n  /**\n   * Set the default handler and execute the match expression\n   * This method triggers evaluation of all accumulated cases\n   *\n   * @param {MatcherHandler<TResult>} handler Function to execute if no cases match\n   * @returns {TResult} The result from the matched handler or the default handler\n   * @throws {UnhandledMatchError} If no case matches and no handler catches it\n   *\n   * @example\n   * ```typescript\n   * const result = match(status)\n   *   .on('active', () => 'Active')\n   *   .on('inactive', () => 'Inactive')\n   *   .otherwise(() => 'Unknown status')\n   * ```\n   *\n   * @see default For PHP-compatible alias\n   * @see valueOf For executing without a default handler\n   */\n  otherwise(handler: MatcherHandler<TResult>): TResult {\n    this.defaultHandler = handler\n    return this.evaluate()\n  }\n\n  /**\n   * PHP-compatible alias for otherwise()\n   * Identical behavior - sets default handler and executes\n   *\n   * @param {MatcherHandler<TResult>} handler Function to execute if no cases match\n   * @returns {TResult} The result from the matched handler or the default handler\n   * @throws {UnhandledMatchError} If no case matches\n   *\n   * @example\n   * ```typescript\n   * // PHP-style syntax\n   * const result = match(value)\n   *   .on('case1', () => 'Result1')\n   *   .default(() => 'Default')\n   * ```\n   *\n   * @see otherwise For the standard method\n   */\n  default(handler: MatcherHandler<TResult>): TResult {\n    return this.otherwise(handler)\n  }\n\n  /**\n   * Execute the match expression without a default handler\n   * Throws if no case matches\n   *\n   * @returns {TResult} The result from the matched handler\n   * @throws {UnhandledMatchError} If no case matches\n   *\n   * @example\n   * ```typescript\n   * try {\n   *   const result = match(code)\n   *     .on(200, () => 'OK')\n   *     .on(404, () => 'Not Found')\n   *     .valueOf() // Must have matched\n   * } catch (error) {\n   *   if (error instanceof UnhandledMatchError) {\n   *     console.error('Invalid code:', error.message)\n   *   }\n   * }\n   * ```\n   *\n   * @see otherwise For safe execution with default handler\n   */\n  valueOf(): TResult {\n    return this.evaluate()\n  }\n\n  /**\n   * Evaluate the match expression by finding the matching case\n   *\n   * @private\n   * @returns {TResult} The result from matched handler or default\n   * @throws {UnhandledMatchError} If no match and no default handler\n   */\n  private evaluate(): TResult {\n    if (this.matches.has(this.subject)) {\n      return this.matches.get(this.subject)!()\n    } else if (this.defaultHandler) {\n      return this.defaultHandler()\n    }\n    throw new UnhandledMatchError(this.subject)\n  }\n}\n\n/**\n * Create a new PHP-style match expression\n *\n * @template TSubject The type of the value being matched\n * @template TResult The return type of the match expression handlers\n *\n * @param {TSubject} subject The value to match against (any type)\n * @returns {Matcher<TSubject, TResult>} A Matcher instance for method chaining\n *\n * @example Basic String Matching\n * ```typescript\n * const status = match(statusCode)\n *   .on(200, () => 'success')\n *   .on(404, () => 'not found')\n *   .otherwise(() => 'error')\n * ```\n *\n * @example HTTP Status Codes\n * ```typescript\n * const message = match(code)\n *   .onAny([200, 201, 202], () => 'Success')\n *   .onAny([400, 401, 403], () => 'Client Error')\n *   .on(500, () => 'Server Error')\n *   .otherwise(() => 'Unknown')\n * ```\n *\n * @example Conditional Logic\n * ```typescript\n * const result = match(true)\n *   .on(age < 18, () => 'Minor')\n *   .on(age >= 18 && age < 65, () => 'Adult')\n *   .on(age >= 65, () => 'Senior')\n *   .otherwise(() => 'Unknown')\n * ```\n *\n * @see Matcher For complete API documentation\n */\nfunction match<TSubject, TResult>(subject: TSubject): Matcher<TSubject, TResult> {\n  return new Matcher<TSubject, TResult>(subject)\n}\n\nexport { match, UnhandledMatchError, Matcher }\n"],"names":["UnhandledMatchError","value","Matcher","subject","handler","values","match"],"mappings":"AAmBA,MAAMA,UAA4B,MAAM;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAMtC,YAAYC,GAAgB;AAC1B,UAAM,0BAA0B,KAAK,UAAUA,CAAK,CAAC,EAAE,GACvD,KAAK,OAAO;AAAA,EACd;AACF;AA4BA,MAAMC,EAA2B;AAAA;AAAA;AAAA;AAAA;AAAA,EAKd;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAOA,8BAAsD,IAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAM/D;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EASR,YAAYC,GAAmB;AAC7B,SAAK,UAAUA;AAAA,EACjB;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAiBA,GAAGF,GAAiBG,GAAwC;AAC1D,gBAAK,QAAQ,IAAIH,GAAOG,CAAO,GACxB;AAAA,EACT;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAoBA,MAAMC,GAA6BD,GAAwC;AACzE,WAAAC,EAAO,QAAQ,CAACJ,MAAU,KAAK,QAAQ,IAAIA,GAAOG,CAAO,CAAC,GACnD;AAAA,EACT;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAqBA,UAAUA,GAA2C;AACnD,gBAAK,iBAAiBA,GACf,KAAK,SAAA;AAAA,EACd;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAoBA,QAAQA,GAA2C;AACjD,WAAO,KAAK,UAAUA,CAAO;AAAA,EAC/B;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EAyBA,UAAmB;AACjB,WAAO,KAAK,SAAA;AAAA,EACd;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA,EASQ,WAAoB;AAC1B,QAAI,KAAK,QAAQ,IAAI,KAAK,OAAO;AAC/B,aAAO,KAAK,QAAQ,IAAI,KAAK,OAAO,EAAA;AACtC,QAAW,KAAK;AACd,aAAO,KAAK,eAAA;AAEd,UAAM,IAAIJ,EAAoB,KAAK,OAAO;AAAA,EAC5C;AACF;AAuCA,SAASM,EAAyBH,GAA+C;AAC/E,SAAO,IAAID,EAA2BC,CAAO;AAC/C;"}

dist/index.umd.js

@@ -1,2 +0,2 @@
-(function(e,t){typeof exports=="object"&&typeof module<"u"?t(exports):typeof define=="function"&&define.amd?define(["exports"],t):(e=typeof globalThis<"u"?globalThis:e||self,t(e.match={}))})(this,function(e){"use strict";function t(f){const i=[];return{on(o,n){return i.push({value:o,handler:n}),this},otherwise(o){for(const n of i)if(n.value===f)return n.handler();return o()}}}e.match=t,Object.defineProperty(e,Symbol.toStringTag,{value:"Module"})});
+(function(t,n){typeof exports=="object"&&typeof module<"u"?n(exports):typeof define=="function"&&define.amd?define(["exports"],n):(t=typeof globalThis<"u"?globalThis:t||self,n(t.match={}))})(this,(function(t){"use strict";class n extends Error{constructor(e){super(`Unhandled match value: ${JSON.stringify(e)}`),this.name="UnhandledMatchError"}}class h{subject;matches=new Map;defaultHandler;constructor(e){this.subject=e}on(e,r){return this.matches.set(e,r),this}onAny(e,r){return e.forEach(i=>this.matches.set(i,r)),this}otherwise(e){return this.defaultHandler=e,this.evaluate()}default(e){return this.otherwise(e)}valueOf(){return this.evaluate()}evaluate(){if(this.matches.has(this.subject))return this.matches.get(this.subject)();if(this.defaultHandler)return this.defaultHandler();throw new n(this.subject)}}function a(s){return new h(s)}t.Matcher=h,t.UnhandledMatchError=n,t.match=a,Object.defineProperty(t,Symbol.toStringTag,{value:"Module"})}));
 //# sourceMappingURL=index.umd.js.map

dist/index.umd.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"index.umd.js","sources":["../src/match.ts"],"sourcesContent":["// import { Match } from './types/main'\n\nimport { Handler, MatchChain } from './types/main'\n\n// const match = <T, U>(value: T) => {\n//   const cases: Match<T, U>[] = []\n//   let defaultAction: (() => U) | null = null\n\n//   const matcher = {\n//     on: (expected: T, action: () => U) => {\n//       const predicate = (val: T) => val === expected\n//       cases.push({ predicate, action })\n//       return matcher\n//     },\n//     otherwise: (action: () => U): U => {\n//       defaultAction = action\n//       return execute()\n//     }\n//   }\n\n//   const execute = (): U => {\n//     for (const { predicate, action } of cases) {\n//       if (predicate(value)) {\n//         return action()\n//       }\n//     }\n//     if (defaultAction) {\n//       return defaultAction()\n//     }\n//     throw new Error('No match found and no default action provided.')\n//   }\n\n//   return matcher\n// }\n\n// export { match }\n\nfunction match<T = unknown>(subject: any): MatchChain<T> {\n  const cases: Array<{ value: any; handler: Handler<T> }> = []\n\n  return {\n    on(value: any, handler: Handler<T>) {\n      cases.push({ value, handler })\n      return this\n    },\n    otherwise(handler: Handler<T>) {\n      // Check each case\n      for (const c of cases) {\n        if (c.value === subject) {\n          // Found a matching case\n          return c.handler()\n        }\n      }\n      // If none matched, call otherwise handler\n      return handler()\n    }\n  }\n}\n\nexport { match }\nexport type { MatchChain }\n"],"names":["match","subject","cases","value","handler","c"],"mappings":"6NAqCA,SAASA,EAAmBC,EAA6B,CACvD,MAAMC,EAAoD,CAAC,EAEpD,MAAA,CACL,GAAGC,EAAYC,EAAqB,CAClC,OAAAF,EAAM,KAAK,CAAE,MAAAC,EAAO,QAAAC,CAAA,CAAS,EACtB,IACT,EACA,UAAUA,EAAqB,CAE7B,UAAWC,KAAKH,EACV,GAAAG,EAAE,QAAUJ,EAEd,OAAOI,EAAE,QAAQ,EAIrB,OAAOD,EAAQ,CAAA,CAEnB,CACF"}
+{"version":3,"file":"index.umd.js","sources":["../src/Matcher.ts"],"sourcesContent":["import type { MatcherHandler } from './types/main'\n\n/**\n * Error thrown when a match expression has no matching case and no default handler\n *\n * @class UnhandledMatchError\n * @extends Error\n *\n * @example\n * try {\n *   match('foo')\n *     .on('bar', () => 'never matches')\n *     .valueOf()\n * } catch (error) {\n *   if (error instanceof UnhandledMatchError) {\n *     console.error('No match found')\n *   }\n * }\n */\nclass UnhandledMatchError extends Error {\n  /**\n   * Create an UnhandledMatchError\n   *\n   * @param {unknown} value The value that could not be matched\n   */\n  constructor(value: unknown) {\n    super(`Unhandled match value: ${JSON.stringify(value)}`)\n    this.name = 'UnhandledMatchError'\n  }\n}\n\n/**\n * Matcher class implementing PHP-style match expressions for TypeScript/JavaScript\n * Supports exhaustive matching with type safety and O(1) lookup performance\n *\n * @template TSubject The type of values being matched against\n * @template TResult The return type of the match expression\n *\n * @class Matcher\n *\n * @example\n * ```typescript\n * const result = match('foo')\n *   .on('foo', () => 'matched foo')\n *   .on('bar', () => 'matched bar')\n *   .otherwise(() => 'default')\n * ```\n *\n * @example HTTP Status Codes\n * ```typescript\n * const message = match(statusCode)\n *   .on(200, () => 'OK')\n *   .onAny([201, 202], () => 'Accepted')\n *   .on(404, () => 'Not Found')\n *   .otherwise(() => 'Unknown')\n * ```\n */\nclass Matcher<TSubject, TResult> {\n  /**\n   * The value being matched against\n   * @private\n   */\n  private readonly subject: TSubject\n\n  /**\n   * Map of values to their corresponding handler functions\n   * Uses Map for O(1) lookup performance\n   * @private\n   */\n  private readonly matches: Map<TSubject, MatcherHandler<TResult>> = new Map()\n\n  /**\n   * Default handler to execute if no cases match\n   * @private\n   */\n  private defaultHandler?: MatcherHandler<TResult>\n\n  /**\n   * Create a new Matcher instance\n   *\n   * @param {TSubject} subject The value to match against\n   *\n   * @internal Use the `match()` function instead of instantiating directly\n   */\n  constructor(subject: TSubject) {\n    this.subject = subject\n  }\n\n  /**\n   * Add a case to match against the subject\n   * Uses strict equality (===) for comparison\n   *\n   * @param {TSubject} value The value to match against\n   * @param {MatcherHandler<TResult>} handler Function to execute if this value matches\n   * @returns {this} The matcher instance for method chaining\n   *\n   * @example\n   * ```typescript\n   * match('hello')\n   *   .on('hello', () => 'matched')\n   *   .on('goodbye', () => 'not matched')\n   * ```\n   */\n  on(value: TSubject, handler: MatcherHandler<TResult>): this {\n    this.matches.set(value, handler)\n    return this\n  }\n\n  /**\n   * Add multiple values that map to the same handler\n   * Simulates PHP's comma-separated case syntax\n   *\n   * @param {readonly TSubject[]} values Array of values to match\n   * @param {MatcherHandler<TResult>} handler Function to execute if any value matches\n   * @returns {this} The matcher instance for method chaining\n   *\n   * @example HTTP Status Codes\n   * ```typescript\n   * match(statusCode)\n   *   .onAny([200, 201, 202], () => 'Success')\n   *   .onAny([400, 401, 403], () => 'Client Error')\n   *   .otherwise(() => 'Unknown')\n   * ```\n   *\n   * @see on For matching a single value\n   */\n  onAny(values: readonly TSubject[], handler: MatcherHandler<TResult>): this {\n    values.forEach((value) => this.matches.set(value, handler))\n    return this\n  }\n\n  /**\n   * Set the default handler and execute the match expression\n   * This method triggers evaluation of all accumulated cases\n   *\n   * @param {MatcherHandler<TResult>} handler Function to execute if no cases match\n   * @returns {TResult} The result from the matched handler or the default handler\n   * @throws {UnhandledMatchError} If no case matches and no handler catches it\n   *\n   * @example\n   * ```typescript\n   * const result = match(status)\n   *   .on('active', () => 'Active')\n   *   .on('inactive', () => 'Inactive')\n   *   .otherwise(() => 'Unknown status')\n   * ```\n   *\n   * @see default For PHP-compatible alias\n   * @see valueOf For executing without a default handler\n   */\n  otherwise(handler: MatcherHandler<TResult>): TResult {\n    this.defaultHandler = handler\n    return this.evaluate()\n  }\n\n  /**\n   * PHP-compatible alias for otherwise()\n   * Identical behavior - sets default handler and executes\n   *\n   * @param {MatcherHandler<TResult>} handler Function to execute if no cases match\n   * @returns {TResult} The result from the matched handler or the default handler\n   * @throws {UnhandledMatchError} If no case matches\n   *\n   * @example\n   * ```typescript\n   * // PHP-style syntax\n   * const result = match(value)\n   *   .on('case1', () => 'Result1')\n   *   .default(() => 'Default')\n   * ```\n   *\n   * @see otherwise For the standard method\n   */\n  default(handler: MatcherHandler<TResult>): TResult {\n    return this.otherwise(handler)\n  }\n\n  /**\n   * Execute the match expression without a default handler\n   * Throws if no case matches\n   *\n   * @returns {TResult} The result from the matched handler\n   * @throws {UnhandledMatchError} If no case matches\n   *\n   * @example\n   * ```typescript\n   * try {\n   *   const result = match(code)\n   *     .on(200, () => 'OK')\n   *     .on(404, () => 'Not Found')\n   *     .valueOf() // Must have matched\n   * } catch (error) {\n   *   if (error instanceof UnhandledMatchError) {\n   *     console.error('Invalid code:', error.message)\n   *   }\n   * }\n   * ```\n   *\n   * @see otherwise For safe execution with default handler\n   */\n  valueOf(): TResult {\n    return this.evaluate()\n  }\n\n  /**\n   * Evaluate the match expression by finding the matching case\n   *\n   * @private\n   * @returns {TResult} The result from matched handler or default\n   * @throws {UnhandledMatchError} If no match and no default handler\n   */\n  private evaluate(): TResult {\n    if (this.matches.has(this.subject)) {\n      return this.matches.get(this.subject)!()\n    } else if (this.defaultHandler) {\n      return this.defaultHandler()\n    }\n    throw new UnhandledMatchError(this.subject)\n  }\n}\n\n/**\n * Create a new PHP-style match expression\n *\n * @template TSubject The type of the value being matched\n * @template TResult The return type of the match expression handlers\n *\n * @param {TSubject} subject The value to match against (any type)\n * @returns {Matcher<TSubject, TResult>} A Matcher instance for method chaining\n *\n * @example Basic String Matching\n * ```typescript\n * const status = match(statusCode)\n *   .on(200, () => 'success')\n *   .on(404, () => 'not found')\n *   .otherwise(() => 'error')\n * ```\n *\n * @example HTTP Status Codes\n * ```typescript\n * const message = match(code)\n *   .onAny([200, 201, 202], () => 'Success')\n *   .onAny([400, 401, 403], () => 'Client Error')\n *   .on(500, () => 'Server Error')\n *   .otherwise(() => 'Unknown')\n * ```\n *\n * @example Conditional Logic\n * ```typescript\n * const result = match(true)\n *   .on(age < 18, () => 'Minor')\n *   .on(age >= 18 && age < 65, () => 'Adult')\n *   .on(age >= 65, () => 'Senior')\n *   .otherwise(() => 'Unknown')\n * ```\n *\n * @see Matcher For complete API documentation\n */\nfunction match<TSubject, TResult>(subject: TSubject): Matcher<TSubject, TResult> {\n  return new Matcher<TSubject, TResult>(subject)\n}\n\nexport { match, UnhandledMatchError, Matcher }\n"],"names":["UnhandledMatchError","value","Matcher","subject","handler","values","match"],"mappings":"8NAmBA,MAAMA,UAA4B,KAAM,CAMtC,YAAYC,EAAgB,CAC1B,MAAM,0BAA0B,KAAK,UAAUA,CAAK,CAAC,EAAE,EACvD,KAAK,KAAO,qBACd,CACF,CA4BA,MAAMC,CAA2B,CAKd,QAOA,YAAsD,IAM/D,eASR,YAAYC,EAAmB,CAC7B,KAAK,QAAUA,CACjB,CAiBA,GAAGF,EAAiBG,EAAwC,CAC1D,YAAK,QAAQ,IAAIH,EAAOG,CAAO,EACxB,IACT,CAoBA,MAAMC,EAA6BD,EAAwC,CACzE,OAAAC,EAAO,QAASJ,GAAU,KAAK,QAAQ,IAAIA,EAAOG,CAAO,CAAC,EACnD,IACT,CAqBA,UAAUA,EAA2C,CACnD,YAAK,eAAiBA,EACf,KAAK,SAAA,CACd,CAoBA,QAAQA,EAA2C,CACjD,OAAO,KAAK,UAAUA,CAAO,CAC/B,CAyBA,SAAmB,CACjB,OAAO,KAAK,SAAA,CACd,CASQ,UAAoB,CAC1B,GAAI,KAAK,QAAQ,IAAI,KAAK,OAAO,EAC/B,OAAO,KAAK,QAAQ,IAAI,KAAK,OAAO,EAAA,EACtC,GAAW,KAAK,eACd,OAAO,KAAK,eAAA,EAEd,MAAM,IAAIJ,EAAoB,KAAK,OAAO,CAC5C,CACF,CAuCA,SAASM,EAAyBH,EAA+C,CAC/E,OAAO,IAAID,EAA2BC,CAAO,CAC/C"}

package.json

 {
   "name": "@anilkumarthakur/match",
+  "description": "PHP-style match expressions for JavaScript/TypeScript",
   "private": false,
-  "version": "0.0.7",
+  "version": "0.0.8",
   "type": "module",
+  "license": "MIT",
   "main": "dist/index.umd.js",
   "module": "dist/index.es.js",
   "types": "dist/index.d.ts",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/anilkumarthakur60/js-match.git"
+  },
+  "bugs": {
+    "url": "https://github.com/anilkumarthakur60/js-match/issues"
+  },
+  "homepage": "https://github.com/anilkumarthakur60/js-match#readme",
   "files": [
-    "/dist"
+    "dist",
+    "test"
   ],
@@ -17,5 +28,5 @@ "publishConfig": {
     ".": {
+      "types": "./dist/index.d.ts",
       "import": "./dist/index.es.js",
-      "require": "./dist/index.umd.js",
-      "types": "./dist/index.d.ts"
+      "require": "./dist/index.umd.js"
     }
@@ -25,48 +36,43 @@ },
     "dev": "vite",
-    "build": "tsc && vite build",
+    "build": "tsc --noEmit && vite build",
     "preview": "vite preview",
+    "docs:dev": "vitepress dev docs",
+    "docs:build": "vitepress build docs",
+    "docs:preview": "vitepress preview docs",
     "test": "jest",
+    "test:coverage": "jest --coverage",
     "lint": "eslint . --ext .vue,.js,.jsx,.cjs,.mjs,.ts,.tsx,.cts,.mts --fix --ignore-path .gitignore",
     "format": "prettier --write src/",
-    "lint-format":"npm run lint && npm run format"
+    "lint-format": "npm run lint && npm run format"
   },
   "devDependencies": {
-    "@rushstack/eslint-patch": "^1.8.0",
-    "@types/jest": "^29.5.12",
-    "@types/node": "^20.13.0",
-    "@typescript-eslint/eslint-plugin": "^7.11.0",
-    "@typescript-eslint/parser": "^7.11.0",
-    "eslint": "^8.57.0",
-    "jest": "^29.7.0",
-    "prettier": "^3.2.5",
-    "ts-jest": "^29.1.4",
+    "@changesets/cli": "^2.29.8",
+    "@rushstack/eslint-patch": "^1.15.0",
+    "@semantic-release/changelog": "^6.0.3",
+    "@semantic-release/git": "^10.0.1",
+    "@types/jest": "^30.0.0",
+    "@types/node": "^25.0.9",
+    "@typescript-eslint/eslint-plugin": "^8.53.0",
+    "@typescript-eslint/parser": "^8.53.0",
+    "eslint": "^9.39.2",
+    "jest": "^30.2.0",
+    "prettier": "^3.8.0",
+    "semantic-release": "^25.0.2",
+    "ts-jest": "^29.4.6",
     "ts-node": "^10.9.2",
-    "typescript": "^5.2.2",
-    "vite": "^5.2.0",
-    "vite-plugin-dts": "^3.9.1"
+    "typescript": "^5.9.3",
+    "vite": "^7.3.1",
+    "vite-plugin-dts": "^4.5.4",
+    "vitepress": "^1.6.4"
   },
-  "dependencies": {
-  },
-  "peerDependencies": {},
   "keywords": [
     "match",
+    "match-expression",
+    "pattern-matching",
+    "php-match",
     "typescript",
     "javascript",
-    "conditional",
-    "logic",
-    "pattern-matching",
-    "php-match",
-    "npm",
-    "library",
-    "match-expression",
-    "match-library",
-    "match-js",
-    "match-js-library",
-    "match-js-npm",
-    "match-js-package",
-    "match-js-package-npm",
-    "match-js-package-npm-library",
-    "php match expression in javascript",
-    "php match in javascript"
+    "switch-alternative",
+    "conditional"
   ]
-}
+}

README.md

 # @anilkumarthakur/match
 
-`@anilkumarthakur/match` is a JavaScript library inspired by PHP's match expression. It allows for more readable and
-maintainable code by providing a clean and concise way to handle small to large conditional logic.
+[![npm version](https://img.shields.io/npm/v/@anilkumarthakur/match)](https://www.npmjs.com/package/@anilkumarthakur/match)
+[![license](https://img.shields.io/npm/l/@anilkumarthakur/match)](LICENSE)
+[![tests](https://img.shields.io/badge/tests-245-brightgreen)](test/)
+[![coverage](https://img.shields.io/badge/coverage-100%25-brightgreen)](#)
 
+PHP-style match expressions for JavaScript/TypeScript with 100% type safety and comprehensive test coverage.
+
+`@anilkumarthakur/match` brings the power and elegance of PHP's match expression to the JavaScript/TypeScript world. It provides a clean, type-safe alternative to complex switch statements and nested if-else logic.
+
+## Features
+
+✨ **Type-Safe**: Full TypeScript support with generic types for subject and result  
+🎯 **Readable**: Clean, expressive syntax inspired by PHP match expressions  
+🚀 **Fast**: Efficient equality-based matching using JavaScript's Map  
+📦 **Lightweight**: Zero dependencies, ~1.2KB gzipped  
+🧪 **Well-Tested**: 245 comprehensive tests with 100% code coverage  
+🔗 **Chainable**: Fluent API for method chaining  
+🌍 **Cross-Platform**: Works in Node.js and browsers (ESM + UMD)
+
 ## Installation
-Install the package using npm:
-```shell
+
+### npm
+
+```bash
 npm install @anilkumarthakur/match
 ```
-## Basic Usage
-```ts
-import {match} from '@anilkumarthakur/match';
 
-const handleCheck = (types: string) => {
-    return match(types)
-        .on('success', () => {
-            console.log('----------------success output--', 'success');
-            return 'success';
-        })
-        .on('error', () => {
-            console.log('----------------error output--', 'error');
-            return 'error';
-        })
-        .on('warning', () => {
-            console.log('----------------warning output--', 'warning');
-            return 'warning';
-        })
-        .on('info', () => {
-            console.log('----------------info output--', 'info');
-            return 'info';
-        })
-        .on('defaultNotify', () => {
-            console.log('----------------defaultNotify output--', 'defaultNotify');
-            return 'defaultNotify';
-        })
-        .on('dark', () => {
-            console.log('----------------dark output--', 'dark');
-            return 'dark';
-        })
-        .on('light', () => {
-            console.log('----------------light output--', 'light');
-            return 'light';
-        })
-        .on('spinner', () => {
-            console.log('----------------spinner output--', 'spinner');
-            return 'spinner';
-        })
-        .otherwise(() => {
-            console.log('----------------otherwise output:', 'otherwise');
-            return 'otherwise';
-        });
+### yarn
+
+```bash
+yarn add @anilkumarthakur/match
+```
+
+### bun
+
+```bash
+bun add @anilkumarthakur/match
+```
+
+## Quick Start
+
+```typescript
+import { match } from '@anilkumarthakur/match'
+
+const result = match('success')
+  .on('success', () => 'Operation successful!')
+  .on('error', () => 'Something went wrong')
+  .otherwise(() => 'Unknown status')
+
+console.log(result) // "Operation successful!"
+```
+
+## API Reference
+
+### `match<TSubject, TResult>(subject: TSubject): Matcher`
+
+Creates a new match expression for the given subject value.
+
+**Parameters:**
+
+- `subject` - The value to match against (any type)
+
+**Returns:** A `Matcher` instance for method chaining
+
+**Example:**
+
+```typescript
+const matcher = match(statusCode)
+```
+
+### `on(value: TSubject, handler: () => TResult): Matcher`
+
+Adds a case to match against. Uses strict equality (===) for comparison.
+
+**Parameters:**
+
+- `value` - The value to match
+- `handler` - Function returning the result if matched
+
+**Returns:** The matcher instance (for chaining)
+
+**Example:**
+
+```typescript
+match(status)
+  .on(200, () => 'Success')
+  .on(404, () => 'Not Found')
+```
+
+### `onAny(values: readonly TSubject[], handler: () => TResult): Matcher`
+
+Adds multiple values that all map to the same handler (simulates PHP's comma-separated cases).
+
+**Parameters:**
+
+- `values` - Array of values to match
+- `handler` - Function to execute if any value matches
+
+**Returns:** The matcher instance (for chaining)
+
+**Example:**
+
+```typescript
+match(status)
+  .onAny([200, 201, 202], () => 'Success')
+  .onAny([400, 401, 403], () => 'Client Error')
+```
+
+### `otherwise(handler: () => TResult): TResult`
+
+Sets the default handler and executes the match. Returns immediately with the result.
+
+**Parameters:**
+
+- `handler` - Function to execute if no cases match
+
+**Returns:** The result from matched handler or default handler
+
+**Throws:** `UnhandledMatchError` if no match found and no default provided
+
+**Example:**
+
+```typescript
+const result = match(value)
+  .on('expected', () => 'matched')
+  .otherwise(() => 'default')
+```
+
+### `default(handler: () => TResult): TResult`
+
+PHP-compatible alias for `otherwise()`. Identical behavior.
+
+**Example:**
+
+```typescript
+const result = match(value)
+  .on('expected', () => 'matched')
+  .default(() => 'default')
+```
+
+### `valueOf(): TResult`
+
+Executes the match without a default handler. Throws if no match found.
+
+**Returns:** The result from matched handler
+
+**Throws:** `UnhandledMatchError` if no match found
+
+**Example:**
+
+```typescript
+const result = match('test')
+  .on('test', () => 'matched')
+  .valueOf() // Must have matched something
+```
+
+### `UnhandledMatchError`
+
+Custom error thrown when no case matches and no default handler is provided.
+
+**Properties:**
+
+- `name` - "UnhandledMatchError"
+- `message` - Contains the unmatched value
+
+**Example:**
+
+```typescript
+try {
+  match('foo')
+    .on('bar', () => 'bar')
+    .valueOf()
+} catch (error) {
+  if (error instanceof UnhandledMatchError) {
+    console.error('No match found for:', error.message)
+  }
 }
+```
 
-// Example of using match with various data types
-const complexCheck = (input: unknown) => {
-    return match(input)
-        .on('hello', () => 'Matched hello')
-        .on(42, () => 'Matched number 42')
-        .on(true, () => 'Matched true')
-        .on(null, () => 'Matched null')
-        .on(undefined, () => 'Matched undefined')
-        .otherwise(() => 'No match found');
+## Usage Examples
+
+### Basic String Matching
+
+```typescript
+import { match } from '@anilkumarthakur/match'
+
+const getRole = (role: string) => {
+  return match(role)
+    .on('admin', () => 'Full access')
+    .on('user', () => 'Limited access')
+    .on('guest', () => 'Read-only access')
+    .otherwise(() => 'Unknown role')
 }
 
-console.log(handleCheck('success'));
-console.log(complexCheck('hello'));
-console.log(complexCheck(42));
-console.log(complexCheck(true));
-console.log(complexCheck(null));
-console.log(complexCheck('unmatched'));
+console.log(getRole('admin')) // "Full access"
 ```
+
+### Number Matching (HTTP Status Codes)
+
+```typescript
+const handleResponse = (statusCode: number) => {
+  return match(statusCode)
+    .on(200, () => 'OK')
+    .onAny([201, 202, 204], () => 'Created/Accepted')
+    .on(400, () => 'Bad Request')
+    .on(401, () => 'Unauthorized')
+    .on(404, () => 'Not Found')
+    .on(500, () => 'Server Error')
+    .otherwise(() => 'Unknown Status')
+}
+
+console.log(handleResponse(200)) // "OK"
+console.log(handleResponse(201)) // "Created/Accepted"
+console.log(handleResponse(999)) // "Unknown Status"
+```
+
+### Complex Notifications
+
+```typescript
+const showNotification = (type: string, message: string) => {
+  const styling = match(type)
+    .on('success', () => ({ color: 'green', icon: '✓' }))
+    .on('error', () => ({ color: 'red', icon: '✗' }))
+    .on('warning', () => ({ color: 'orange', icon: '⚠' }))
+    .on('info', () => ({ color: 'blue', icon: 'ℹ' }))
+    .otherwise(() => ({ color: 'gray', icon: '•' }))
+
+  return `[${styling.icon}] ${message}`
+}
+
+console.log(showNotification('success', 'Saved!')) // "[✓] Saved!"
+console.log(showNotification('error', 'Failed!')) // "[✗] Failed!"
+```
+
+### Nested Match Expressions
+
+```typescript
+const getUserStatus = (userId: string, status: string) => {
+  return match(userId)
+    .on('admin', () => {
+      return match(status)
+        .on('active', () => 'Admin is active')
+        .on('inactive', () => 'Admin is inactive')
+        .otherwise(() => 'Admin status unknown')
+    })
+    .on('user', () => {
+      return match(status)
+        .on('active', () => 'User is active')
+        .otherwise(() => 'User is inactive')
+    })
+    .otherwise(() => 'User not found')
+}
+
+console.log(getUserStatus('admin', 'active')) // "Admin is active"
+console.log(getUserStatus('user', 'active')) // "User is active"
+console.log(getUserStatus('guest', 'active')) // "User not found"
+```
+
+### Type-Safe Unions
+
+```typescript
+type LogLevel = 'debug' | 'info' | 'warn' | 'error'
+
+const getLogColor = (level: LogLevel): string => {
+  return match(level)
+    .on('debug', () => 'gray')
+    .on('info', () => 'blue')
+    .on('warn', () => 'yellow')
+    .on('error', () => 'red')
+    .otherwise(() => 'white')
+}
+
+console.log(getLogColor('info')) // "blue"
+```
+
+### Conditional Logic with match(true)
+
+```typescript
+const getUserMessage = (age: number, isPremium: boolean) => {
+  return match(true)
+    .on(age < 13, () => 'Not eligible')
+    .on(age >= 13 && age < 18, () => 'Teen user')
+    .on(age >= 18 && !isPremium, () => 'Free user')
+    .on(age >= 18 && isPremium, () => 'Premium user')
+    .otherwise(() => 'Unknown')
+}
+
+console.log(getUserMessage(25, true)) // "Premium user"
+console.log(getUserMessage(16, false)) // "Teen user"
+```
+
+### Days in Month (Real-World Example)
+
+```typescript
+const daysInMonth = (month: string, year: number): number => {
+  const isLeap = (y: number) => y % 4 === 0 && (y % 100 !== 0 || y % 400 === 0)
+
+  return match(month.toLowerCase().slice(0, 3))
+    .on('jan', () => 31)
+    .on('feb', () => (isLeap(year) ? 29 : 28))
+    .on('mar', () => 31)
+    .on('apr', () => 30)
+    .on('may', () => 31)
+    .on('jun', () => 30)
+    .on('jul', () => 31)
+    .on('aug', () => 31)
+    .on('sep', () => 30)
+    .on('oct', () => 31)
+    .on('nov', () => 30)
+    .on('dec', () => 31)
+    .otherwise(() => {
+      throw new Error('Invalid month')
+    })
+}
+
+console.log(daysInMonth('February', 2024)) // 29 (leap year)
+console.log(daysInMonth('February', 2025)) // 28
+```
+
+## Comparison with PHP match()
+
+### PHP
+
+```php
+$result = match($status) {
+    'success', 'ok' => 'All good',
+    'error', 'fail' => 'Something went wrong',
+    default => 'Unknown'
+};
+```
+
+### JavaScript (this library)
+
+```typescript
+const result = match(status)
+  .onAny(['success', 'ok'], () => 'All good')
+  .onAny(['error', 'fail'], () => 'Something went wrong')
+  .otherwise(() => 'Unknown')
+```
+
+## Supported Types
+
+The library supports matching on any JavaScript type using strict equality (===):
+
+- ✅ Strings
+- ✅ Numbers (including Infinity, -Infinity)
+- ✅ Booleans
+- ✅ null / undefined
+- ✅ Symbols
+- ✅ BigInt
+- ✅ Objects (by reference)
+- ✅ Arrays (by reference)
+- ✅ Functions (by reference)
+- ✅ Enums
+- ✅ Class instances (by reference)
+
+## Type Safety
+
+Full TypeScript support with automatic type inference:
+
+```typescript
+// Explicit types
+const result = match<string, number>('test')
+  .on('test', () => 123)
+  .otherwise(() => 456)
+
+// Inferred types
+const result2 = match('test')
+  .on('test', () => 'result') // Inferred as string result
+  .otherwise(() => 'default')
+
+// Union types
+type Status = 'success' | 'pending' | 'error'
+const result3 = match<Status, string>('success')
+  .on('success', () => 'Done')
+  .on('pending', () => 'In progress')
+  .on('error', () => 'Failed')
+  .otherwise(() => 'Unknown')
+```
+
+## Performance
+
+- ⚡ Uses JavaScript Map for O(1) lookup time
+- 💾 Lazy evaluation - only matched handler executes
+- 📦 ~1.2KB gzipped bundle size
+
+## Testing
+
+The library includes 245 comprehensive tests with 100% code coverage:
+
+```bash
+# Run all tests
+npm test
+
+# Run with coverage
+npm run test:coverage
+
+# Watch mode
+npm test -- --watch
+```
+
+Test categories:
+
+- Basic functionality
+- Type matching (strings, numbers, booleans, objects, arrays, etc.)
+- All API methods (on, onAny, otherwise, default, valueOf)
+- Error handling
+- Type safety
+- Real-world examples
+- Edge cases and performance
+
+## Browser Support
+
+Works in all modern browsers and Node.js 14+:
+
+- Chrome/Edge (latest)
+- Firefox (latest)
+- Safari (latest)
+- Node.js 14+
+
 ## Contributing
-Feel free to submit issues and pull requests. Contributions are welcome!
+
+Contributions are welcome! Please feel free to submit issues and pull requests.
+
+### Development
+
+```bash
+# Install dependencies
+npm install
+
+# Run tests
+npm test
+
+# Build
+npm run build
+
+# Lint and format
+npm run lint-format
+```
+
+## License
+
+MIT - See [LICENSE](LICENSE) for details
+
+## Author
+
+[Anil Kumar Thakur](https://github.com/anilkumarthakur60)
+
+## Related
+
+- [PHP match expression](https://www.php.net/manual/en/control-structures.match.php) - Official PHP documentation
+- [JavaScript switch statement](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/switch)
+
+## Changelog
+
+See [CHANGELOG.md](CHANGELOG.md) for release history and updates.

dist/index.d.ts

-import { match } from './match';
-import { MatchChain as matchType, Handler as handlerType } from './types/main';
-
-export { match };
-export type { matchType, handlerType };

dist/match.d.ts

-import { MatchChain } from './types/main';
-
-declare function match<T = unknown>(subject: any): MatchChain<T>;
-export { match };
-export type { MatchChain };

dist/types/main.d.ts

-export type Handler<T> = () => T;
-export interface MatchChain<T> {
-    on: (value: any, handler: Handler<T>) => MatchChain<T>;
-    otherwise: (handler: Handler<T>) => T;
-}

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