cert-is

cert-is

Provides a collection of assertion tools for checking strict equality, type, and range of a set of values.

This project aims to simplify runtime value checking for safety-critical applications.

Migration Notice 0.2.1 --> 1.0.0:

• Certifier.isRange and Checker.isRange have been removed.
• Exports are now structured as follows:

export declare function cert(...values: any): Certifier
export declare function check(...values: any): Checker
export {
  Certifier,
  Checker,
  RangeArgumentError,
  RangeAssertionError,
  TypeArgumentError,
  TypeAssertionError,
  ValueArgumentError,
  ValueAssertionError
};
export default cert;

• Project has been converted to TypeScript

Update 1.0.0:

• This library has been converted to TypeScript, but development will likely stop here.
• Please check out jpcx/restrict-v instead.

Installation

yarn add cert-is

Testing

cd /path/to/node_modules/cert-is
yarn install -dev
yarn test

Contribution

Please raise an issue if you find any. Pull requests are welcome!

Documentation

Module: cert-is

Index

Classes

• Certifier
• Checker
• RangeArgumentError
• RangeAssertionError
• TypeArgumentError
• TypeAssertionError
• ValueArgumentError
• ValueAssertionError

Type aliases

• AnyConstructorFunction

Functions

• cert
• check

Type aliases

AnyConstructorFunction

Ƭ AnyConstructorFunction: object

Defined in src/certifier.ts:16

Any function that uses new to construct an object.

Type declaration:

Functions

cert

▸ cert(...values: any): Certifier

Defined in src/index.ts:59

Constructs a Certifier instance given a set of values. All values must pass the supplied tests.

func cert

example

const certifier = cert('foo', 'bar')
certifier.is('foo') // undefined
certifier.is('bar') // undefined
certifier.is('qux') // THROWS ValueAssertionError

example

cert('foo').is('foo')                      // returns Certifier instance
cert('foo').is('bar')                      // THROWS ValueAssertionError
cert('foo').is('foo', 'bar')               // returns Certifier instance
cert('foo').isNot('foo')                   // THROWS ValueAssertionError
cert('foo').isType('string')               // returns Certifier instance
cert('foo').isType('number')               // THROWS TypeAssertionError
cert('foo').isType('string', 'number')     // returns Certifier instance
cert(new Map()).isType(Map)                // returns Certifier instance
cert(new Map()).isType(Object)             // returns Certifier instance
cert(new Map()).isType(Set)                // THROWS TypeAssertionError
cert(new Map()).isType(Map, Set)           // returns Certifier instance
cert(15).isGT(2)                           // returns Certifier instance
cert(15).isGT(2).isLT(17)                  // returns Certifier instance
cert(18).isGT(17).isLT(2)                  // THROWS RangeAssertionError
cert(15).isGT(15)                          // THROWS RangeAssertionError
cert(15).isGTE(15)                         // returns Certifier instance
cert(15, 23).isGTE(15)                     // returns Certifier instance
cert(15, 23).isGTE('foo')                  // THROWS TypeArgumentError

Parameters:

Name	Type	Description
...values	any	Values to construct Certifier with.

Returns: Certifier

Certifier instance.

---

check

▸ check(...values: any): Checker

Defined in src/index.ts:80

Constructs a Checker instance given a set of values. All values must pass the supplied tests.

func check

example

check('foo').is('foo')        // returns true
check('foo').is('bar')        // returns Checker instance
check('foo').isType('string') // returns true
check('foo').isType('bar')    // THROWS TypeArgumentError
check('foo').isGT('')         // THROWS TypeArgumentError

Parameters:

Name	Type	Description
...values	any	Values to construct Checker with.

Returns: Checker

Checker instance.

License

This project is licensed under the MIT License - see the LICENSE file for details