Package Exports

@js-utilities/typecheck

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Readme

Type checking library

A set of super-simple type checkers. Each checker returns boolean value. Most checkers are typescript type predicates.

Installation

npm i -S @js-utilities/typecheck

Usage example

import { isBoolean } from "@js-utilities/typecheck";

const defaultValue = isBoolean(option.isEnabled) ? option.isEnabled : true;

import { isCallable } from "@js-utilities/typecheck";

const a: unknown = global.value;

if (isCallable(a)) a();

Available checkers:

Checker	Return type
`isCallable`	`boolean`
`isFunction`	`value is Function`
`isArrowFunction`	`boolean`
`isArray<T>`	`value is T[]`
`isObject<T>`	`value is T`
`isBoolean`	`value is boolean`
`isUndefined`	`value is undefined`
`isNumber`	`value is number`
`isString`	`value is string`
`isSymbol`	`value is symbol`
`isNull`	`value is null`
`isMap<T, U>`	`value is Map<T, U>`
`isSet<T>`	`value is Set<T>`
`isWeakSet<T>`	`value is WeakSet<T>`
`isWeakMap<T, U>`	`value is WeakMap<T, U>`

License

MIT License