@suchipi/is

Functions for testing the types of JavaScript values, cross-realm. Has testers for all standard built-in objects/values.

Usage

import { is } from "@suchipi/is";

console.log(is.Object({})); // true
console.log(is.Array([])); // true
console.log(is.String(null)); // false

// etc

Available functions

• String
• string (alias of String)
• Number (does not return true for NaN)
• number (alias of Number)
• Boolean
• boolean (alias of Boolean)
• BigInt
• bigint (alias of BigInt)
• Symbol
• symbol (alias of Symbol)
• null
• undefined
• void
• Object (does not return true for null)
• object (alias of Object)
• Array
• Function
• function (alias of Function)
• tagged (Object toString tag checker)
• instanceOf (same as instanceof)
• Error (matches Error subclasses, too)
• Infinity
• NegativeInfinity
• NaN
• Date
• RegExp
• Map
• Set
• WeakMap
• WeakSet
• ArrayBuffer
• SharedArrayBuffer
• DataView
• TypedArray
• Int8Array
• Uint8Array
• Uint8ClampedArray
• Int16Array
• Uint16Array
• Int32Array
• Uint32Array
• Float32Array
• Float64Array
• Promise (matches any thenable)
• Generator (only guaranteed to match generators that weren't compiled with Babel or etc)
• GeneratorFunction (only guaranteed to match generator functions that weren't compiled with Babel or etc)
• AsyncFunction (only guaranteed to match async functions that weren't compiled with Babel or etc)
• AsyncGenerator (only guaranteed to match async generators that weren't compiled with Babel or etc)
• AsyncGeneratorFunction (only guaranteed to match async generator functions that weren't compiled with Babel or etc)

Notes

Two utility types, TypedArray and TypedArrayConstructor, are also exported from this package.

License

MIT