v8is

Type checking on all sorts of values/objects

Note: v8is is only supported on Node.js v4+.

Install

$ npm install v8is

Test

$ npm test

API

require it using:

const v8is = require('v8is')

The following functions are available:

NOTE: each function requires 1 argument. An error will be thrown otherwise

isUndefined(arg)

v8is.isUndefined(undefined) // => true
v8is.isUndefined(null)      // => false

isNull(arg)

v8is.isNull(null)      // => true
v8is.isNull(undefined) // => false

isTrue(arg)

v8is.isTrue(true)  // => true
v8is.isTrue(false) // => false

isFalse(arg)

isString(arg)

isSymbol(arg)

isFunction(arg)

isArray(arg)

isObject(arg)

isBoolean(arg)

isNumber(arg)

isInt32(arg)

isUint32(arg)

isDate(arg)

isArgumentsObject(arg)

isBooleanObject(arg)

isNumberObject(arg)

isStringObject(arg)

isError(arg)

Alias to isNativeError

isRegExp(arg)

isGeneratorFunction(arg)

isGeneratorObject(arg)

isPromise(arg)

only works for native promises

isMap(arg)

isSet(arg)

isMapIterator(arg)

isSetIterator(arg)

isWeakMap(arg)

isWeakSet(arg)

isArrayBuffer(arg)

isArrayBufferView(arg)

isTypedArray(arg)

isUint8Array(arg)

isUint8ClampedArray(arg)

isInt8Array(arg)

isUint16Array(arg)

isInt16Array(arg)

isUint32Array(arg)

isInt32Array(arg)

isFloat32Array(arg)

isFloat64Array(arg)

isDataView(arg)

isSharedArrayBuffer(arg)

isProxy(arg)

Only supported on Node.js v6+. One should check before trying to use this.

'use strict'

const is = require('v8is')
if (is.isProxy) {
  // ...
}

isWebAssemblyCompiledModule(arg)

Only supported on Node.js v7.0+. One should check before trying to use this.

isAsyncFunction(arg)

Only supported on Node.js v7.6+. One should check before trying to use this.

Author

Evan Lucas

License

MIT (See LICENSE for more info)