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ts-api-utils

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ts-api-utils

Utility functions for working with TypeScript's API. Based on the wonderful tsutils.

0.0.21
Source
npm

Version published: 2 years ago

Weekly downloads: 19M; decreased by-1.88%

Maintainers: 1

Weekly downloads

Created: 2 years ago

Source

TypeScript API Tools

Utility functions for working with TypeScript's API. Based on the wonderful tsutils.

Usage

npm i ts-api-utils

import * as tsutils. from "ts-api-utils";

ts-api-utils provides several categories of utility functions:

This package is a partial fork of and replacement for tsutils (original license: MIT). See #3 for notes on API coverage compared to tsutils.

Comments

`forEachComment`

Iterates over all comments owned by node or its children.

type ForEachCommentCallback = (fullText: string, comment: ts.CommentRange) => void
function forEachComment(node: ts.Node, callback: ForEachCommentCallback, sourceFile?: ts.SourceFile): void

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.forEachComment(node, (fullText, comment) => {
	console.log(`Found comment at position ${comment.pos}: '${fullText}'.`);
});

Compiler Options

`isCompilerOptionEnabled`

Checks if a given compiler option is enabled. It handles dependencies of options, e.g. declaration is implicitly enabled by composite or strictNullChecks is enabled by strict. However, it does not check dependencies that are already checked and reported as errors, e.g. checkJs without allowJs. This function only handles boolean flags.

type BooleanCompilerOptions = (all keys of ts.CompilerOptions with a boolean value)
function isCompilerOptionEnabled(options: ts.CompilerOptions, option: BooleanCompilerOptions): boolean

import * as tsutils. from "ts-api-utils";

const options = {
	allowJs: true,
};

tsutils.isCompilerOptionEnabled(options, "allowJs"); // true
tsutils.isCompilerOptionEnabled(options, "allowSyntheticDefaultImports"); // false

`isStrictCompilerOptionEnabled`

Checks if a given compiler option is enabled, accounting for whether all flags (except strictPropertyInitialization) have been enabled by strict: true.

type StrictCompilerOption = (all keys of ts.CompilerOptions relevant to strict)
function isStrictCompilerOptionEnabled(options: ts.CompilerOptions, option: StrictCompilerOption): boolean

import * as tsutils. from "ts-api-utils";

const optionsLenient = {
	noImplicitAny: true,
};

tsutils.isStrictCompilerOptionEnabled(optionsLenient, "noImplicitAny"); // true
tsutils.isStrictCompilerOptionEnabled(optionsLenient, "noImplicitThis"); // false

const optionsStrict = {
	noImplicitThis: false,
	strict: true,
};

tsutils.isStrictCompilerOptionEnabled(optionsStrict, "noImplicitAny"); // true
tsutils.isStrictCompilerOptionEnabled(optionsStrict, "noImplicitThis"); // false

Flags

`isModifierFlagSet`

function isModifierFlagSet(node: ts.Declaration, flag: ts.ModifierFlags): boolean

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isModifierFlagSet(node, ts.ModifierFlags.Abstract);

`isNodeFlagSet`

function isNodeFlagSet(node: ts.Node, flag: ts.NodeFlags): boolean

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isNodeFlagSet(node, ts.NodeFlags.AwaitContext);

`isObjectFlagSet`

function isObjectFlagSet(node: ts.ObjectType, flag: ts.ObjectFlags): boolean

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isObjectFlagSet(node, ts.ObjectFlags.Anonymous);

`isSymbolFlagSet`

function isSymbolFlagSet(symbol: ts.Symbol, flag: ts.SymbolFlags): boolean

import * as tsutils. from "ts-api-utils";

declare const symbol: ts.Symbol;

tsutils.isSymbolFlagSet(symbol, ts.SymbolFlags.Accessor);

`isTypeFlagSet`

function isTypeFlagSet(type: ts.Type, flag: ts.TypeFlags): boolean

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isTypeFlagSet(type, ts.TypeFlags.Any);

Node Type Guards

`isEntityNameExpression`

function isEntityNameExpression(node: ts.Node): node is ts.EntityNameExpression

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isEntityNameExpression(node);

`isExpression`

function isExpression(node: ts.Node): node is ts.Expression

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isExpression(node);

`isNumericOrStringLikeLiteral`

function isNumericOrStringLikeLiteral(node: ts.Node): node is NumericOrStringLikeLiteral

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isNumericOrStringLikeLiteral(node);

`isParameterDeclaration`

function isParameterDeclaration(node: ts.Node): node is ts.ParameterDeclaration

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isParameterDeclaration(node);

`isConstAssertion`

function isConstAssertion(node: ts.AssertionExpression): node is ConstAssertionExpression

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isConstAssertion(node);

Node Utilities

`isBindableObjectDefinePropertyCall`

Determines whether a call to Object.defineProperty is statically analyzable.

function isBindableObjectDefinePropertyCall(node: ts.CallExpression): boolean

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isBindableObjectDefinePropertyCall(node);

`isInConstContext`

Detects whether an expression is affected by an enclosing 'as const' assertion and therefore treated literally.

function isInConstContext(node: ts.Expression): boolean

import * as tsutils. from "ts-api-utils";

declare const node: ts.Expression;

tsutils.isInConstContext(node);

Modifiers

`hasModifier`

function hasModifier(modifiers: Iterable<ts.Modifier> | undefined, ...kinds: ts.Modifier): boolean

import * as tsutils. from "ts-api-utils";

declare const modifiers: ts.Modifier[];

tsutils.hasModifier(modifiers, ts.SyntaxKind.AbstractKeyword);

Scopes

`isFunctionScopeBoundary`

const enum ScopeBoundary { None, Function }
function isFunctionScopeBoundary(node: ts.Node): ScopeBoundary

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.isFunctionScopeBoundary(node);

Syntax

`isAssignmentKind`

function isAssignmentKind(kind: ts.SyntaxKind): boolean

import * as tsutils. from "ts-api-utils";

declare const kind: ts.SyntaxKind;

tsutils.isAssignmentKind(kind);

`isNumericPropertyName`

function isNumericPropertyName(name: string | ts.__String): boolean

import * as tsutils. from "ts-api-utils";

tsutils.isNumericPropertyName("abc"); // false
tsutils.isNumericPropertyName("123"); // true

`isValidPropertyAccess`

Determines whether the given text can be used to access a property with a PropertyAccessExpression while preserving the property's name.

function isValidPropertyAccess(text: string, languageVersion?: ts.ScriptTarget): void

import * as tsutils. from "ts-api-utils";

tsutils.isValidPropertyAccess("abc"); // true
tsutils.isValidPropertyAccess("123"); // false

Tokens

`forEachToken`

Iterates over all tokens of node.

type ForEachTokenCallback = (token: ts.Node) => void
function forEachToken(node: ts.Node, callback: ForEachTokenCallback, sourceFile?: ts.SourceFile): void

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;

tsutils.forEachToken(node, (token) => {
	console.log("Found token:", token.getText());
});

Type Getters

`getCallSignaturesOfType`

function getCallSignaturesOfType(type: ts.Type): readonly ts.Signature[]

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.getCallSignaturesOfType(type);

`getPropertyOfType`

function getPropertyOfType(type: ts.Type, name: ts.__String): ts.Symbol | undefined

import * as tsutils. from "ts-api-utils";

declare const property: ts.Symbol;
declare const type: ts.Type;

tsutils.getPropertyOfType(type, property.getEscapedName());

Type Type Guards

`isConditionalType`

function isConditionalType(type: ts.Type): type is ts.ConditionalType

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isConditionalType(type);

`isIntersectionType`

function isIntersectionType(type: ts.Type): type is ts.IntersectionType

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isIntersectionType(type);

`isLiteralType`

function isLiteralType(type: ts.Type): type is ts.LiteralType

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isLiteralType(type);

`isObjectType`

function isObjectType(type: ts.Type): type is ts.ObjectType

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isObjectType(type);

`isUnionOrIntersectionType`

function isUnionOrIntersectionType(type: ts.Type): type is ts.UnionOrIntersectionType

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isUnionOrIntersectionType(type);

`isUnionType`

function isUnionType(type: ts.Type): type is ts.UnionType

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isUnionType(type);

`isUniqueESSymbolType`

function isUniqueESSymbolType(type: ts.Type): type is ts.UniqueESSymbolType

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isUniqueESSymbolType(type);

`isTupleType`

function isTupleType(type: ts.Type): type is ts.TupleType

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isTupleType(type);

`isTupleTypeReference`

function isTupleTypeReference(type: ts.Type): type is TupleTypeReference

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isTupleTypeReference(type);

`isTypeReference`

function isTypeReference(type: ts.Type): type is ts.TypeReference

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isTypeReference(type);

Type Utilities

`getWellKnownSymbolPropertyOfType`

function getWellKnownSymbolPropertyOfType(type: ts.Type, wellKnownSymbolName: string, typeChecker: ts.TypeChecker): ts.Symbol | undefined

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;
declare const typeChecker: ts.TypeChecker;

tsutils.getWellKnownSymbolPropertyOfType(type, "asyncIterator", typeChecker);

`isBooleanLiteralType`

Determines whether the given type is a boolean literal type and matches the given boolean literal.

function isBooleanLiteralType(type: ts.Type, literal: boolean)

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isBooleanLiteralType(type);

`isFalsyType`

Determines whether a type is definitely falsy. This function doesn't unwrap union types.

function isFalsyType(type: ts.Type): boolean

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.isFalsyType(type);

`isPropertyReadonlyInType`

Determines whether writing to a certain property of a given type is allowed.

function isPropertyReadonlyInType(type: ts.Type, name: ts.__String, typeChecker: ts.TypeChecker): boolean

import * as tsutils. from "ts-api-utils";

declare const property: ts.Symbol;
declare const type: ts.Type;
declare const typeChecker: ts.TypeChecker;

tsutils.isPropertyReadonlyInType(type, property.getEscapedName(), typeChecker);

`isThenableType`

Determines whether a type is thenable and thus can be used with await.

function isThenableType(typeChecker: ts.TypeChecker, node: ts.Node, type: ts.Type): boolean
function isThenableType(typeChecker: ts.TypeChecker, node: ts.Expression, type?: ts.Type): boolean

import * as tsutils. from "ts-api-utils";

declare const node: ts.Node;
declare const type: ts.Type;
declare const typeChecker: ts.TypeChecker;

tsutils.isThenableType(typeChecker, node, type);

declare const expression: ts.Expression;

tsutils.isThenableType(typeChecker, expression);
tsutils.isThenableType(typeChecker, expression, type);

`someTypePart`

type SomeTypePartPredicate = (type: ts.Type) => type is ts.UnionOrIntersectionType
type SomeTypePartCallback = (type: ts.Type) => boolean
function someTypePart(type: ts.Type, predicate: SomeTypePartPredicate, callback: SomeTypePartCallback): boolean

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;
declare const typeChecker: ts.TypeChecker;

tsutils.someTypePart(type, tsutils.isUnionOrIntersectionType, (subType) => {
	console.log("Got a literal type:", typeChecker.typeToString(subType));
});

`symbolHasReadonlyDeclaration`

function symbolHasReadonlyDeclaration(symbol: ts.Symbol, typeChecker: ts.TypeChecker): boolean

import * as tsutils. from "ts-api-utils";

declare const symbol: ts.Symbol;
declare const typeChecker: ts.TypeChecker;

tsutils.symbolHasReadonlyDeclaration(symbol, typeChecker);

`unionTypeParts`

function unionTypeParts(type: ts.Type): ts.Type[]

import * as tsutils. from "ts-api-utils";

declare const type: ts.Type;

tsutils.unionTypeParts(type);

Development

See .github/CONTRIBUTING.md. Thanks! 💖

Contributors

Many thanks to @ajafff for creating the original tsutils that this project is based on and uses a significant majority of code from! 🙌

_{Josh Goldberg}
🔧 💻 📖 ⚠️

_{Klaus Meinhardt}
💻 ⚠️

_{Rebecca Stevens}
💻 🐛

💙 This package is templated from @JoshuaKGoldberg's template-typescript-node-package.

"My tools! I have to have my tools!" - Dennis Reynolds

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Package last updated on 07 Feb 2023

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Install

ts-api-utils

TypeScript API Tools

Usage

Comments

forEachComment

Compiler Options

isCompilerOptionEnabled

isStrictCompilerOptionEnabled

Flags

isModifierFlagSet

isNodeFlagSet

isObjectFlagSet

isSymbolFlagSet

isTypeFlagSet

Node Type Guards

isEntityNameExpression

isExpression

isNumericOrStringLikeLiteral

isParameterDeclaration

isConstAssertion

Node Utilities

isBindableObjectDefinePropertyCall

isInConstContext

Modifiers

hasModifier

Scopes

isFunctionScopeBoundary

Syntax

isAssignmentKind

isNumericPropertyName

isValidPropertyAccess

Tokens

forEachToken

Type Getters

getCallSignaturesOfType

getPropertyOfType

Type Type Guards

isConditionalType

isIntersectionType

isLiteralType

isObjectType

isUnionOrIntersectionType

isUnionType

isUniqueESSymbolType

isTupleType

isTupleTypeReference

isTypeReference

Type Utilities

getWellKnownSymbolPropertyOfType

isBooleanLiteralType

isFalsyType

isPropertyReadonlyInType

isThenableType

someTypePart

symbolHasReadonlyDeclaration

unionTypeParts

Development

Contributors

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`forEachComment`

`isCompilerOptionEnabled`

`isStrictCompilerOptionEnabled`

`isModifierFlagSet`

`isNodeFlagSet`

`isObjectFlagSet`

`isSymbolFlagSet`

`isTypeFlagSet`

`isEntityNameExpression`

`isExpression`

`isNumericOrStringLikeLiteral`

`isParameterDeclaration`

`isConstAssertion`

`isBindableObjectDefinePropertyCall`

`isInConstContext`

`hasModifier`

`isFunctionScopeBoundary`

`isAssignmentKind`

`isNumericPropertyName`

`isValidPropertyAccess`

`forEachToken`

`getCallSignaturesOfType`

`getPropertyOfType`

`isConditionalType`

`isIntersectionType`

`isLiteralType`

`isObjectType`

`isUnionOrIntersectionType`

`isUnionType`

`isUniqueESSymbolType`

`isTupleType`

`isTupleTypeReference`

`isTypeReference`

`getWellKnownSymbolPropertyOfType`

`isBooleanLiteralType`

`isFalsyType`

`isPropertyReadonlyInType`

`isThenableType`

`someTypePart`

`symbolHasReadonlyDeclaration`

`unionTypeParts`