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@sindresorhus/is

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@sindresorhus/is

Type check values

  • 3.1.2
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
15M
decreased by-15.24%
Maintainers
1
Weekly downloads
 
Created

What is @sindresorhus/is?

The @sindresorhus/is npm package is a type-checking library that provides a variety of functions to assert the type of a given value. It can be used to check primitive types, built-in objects, and to perform environment checks.

What are @sindresorhus/is's main functionalities?

Primitive type checking

Check if a value is a string.

const is = require('@sindresorhus/is');
console.log(is.string('Hello World')); // true

Built-in object checking

Check if a value is a Promise.

const is = require('@sindresorhus/is');
console.log(is.promise(new Promise(resolve => resolve()))); // true

Environment checking

Check if the current environment is Node.js.

const is = require('@sindresorhus/is');
console.log(is.nodejs); // true or false depending on the environment

Array checking

Check if a value is an Array.

const is = require('@sindresorhus/is');
console.log(is.array([1, 2, 3])); // true

Object checking

Check if a value is an Object.

const is = require('@sindresorhus/is');
console.log(is.object({foo: 'bar'})); // true

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Package last updated on 21 Aug 2020

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