152 lines
3.7 KiB
JavaScript
152 lines
3.7 KiB
JavaScript
'use strict';
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const toString = Object.prototype.toString;
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const getObjectType = x => toString.call(x).slice(8, -1);
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const is = value => {
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if (value == null) { // eslint-disable-line no-eq-null, eqeqeq
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return 'null';
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}
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if (value === true || value === false) {
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return 'boolean';
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}
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const type = typeof value;
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if (type === 'undefined') {
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return 'undefined';
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}
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if (type === 'string') {
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return 'string';
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}
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if (type === 'number') {
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return 'number';
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}
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if (type === 'symbol') {
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return 'symbol';
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}
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if (type === 'function') {
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return 'Function';
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}
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if (Array.isArray(value)) {
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return 'Array';
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}
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if (Buffer.isBuffer(value)) {
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return 'Buffer';
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}
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const tagType = getObjectType(value);
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if (tagType) {
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return tagType;
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}
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if (value instanceof String || value instanceof Boolean || value instanceof Number) {
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throw new TypeError('Please don\'t use object wrappers for primitive types');
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}
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return 'Object';
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};
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is.undefined = x => typeof x === 'undefined';
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is.null = x => x === null;
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is.string = x => typeof x === 'string';
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is.number = x => typeof x === 'number';
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is.boolean = x => typeof x === 'boolean';
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is.symbol = x => typeof x === 'symbol';
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is.array = Array.isArray;
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is.function = x => typeof x === 'function';
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is.class = x => typeof x === 'function' && x.toString().startsWith('class ');
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is.buffer = Buffer.isBuffer;
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is.object = x => {
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const type = typeof x;
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return x !== null && (type === 'object' || type === 'function');
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};
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is.nativePromise = x => getObjectType(x) === 'Promise';
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is.promise = x => {
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return is.nativePromise(x) ||
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(
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x !== null &&
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typeof x === 'object' &&
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typeof x.then === 'function' &&
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typeof x.catch === 'function'
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);
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};
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is.regExp = x => getObjectType(x) === 'RegExp';
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is.date = x => getObjectType(x) === 'Date';
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is.error = x => getObjectType(x) === 'Error';
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is.map = x => getObjectType(x) === 'Map';
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is.set = x => getObjectType(x) === 'Set';
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is.weakMap = x => getObjectType(x) === 'WeakMap';
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is.weakSet = x => getObjectType(x) === 'WeakSet';
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is.int8Array = x => getObjectType(x) === 'Int8Array';
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is.uint8Array = x => getObjectType(x) === 'Uint8Array';
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is.uint8ClampedArray = x => getObjectType(x) === 'Uint8ClampedArray';
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is.int16Array = x => getObjectType(x) === 'Int16Array';
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is.uint16Array = x => getObjectType(x) === 'Uint16Array';
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is.int32Array = x => getObjectType(x) === 'Int32Array';
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is.uint32Array = x => getObjectType(x) === 'Uint32Array';
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is.float32Array = x => getObjectType(x) === 'Float32Array';
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is.float64Array = x => getObjectType(x) === 'Float64Array';
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is.arrayBuffer = x => getObjectType(x) === 'ArrayBuffer';
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is.sharedArrayBuffer = x => {
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try {
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return getObjectType(x) === 'SharedArrayBuffer';
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} catch (err) {
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return false;
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}
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};
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is.nan = Number.isNaN;
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is.nullOrUndefined = x => x === null || typeof x === 'undefined';
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is.primitive = x => {
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const type = typeof x;
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return x === null ||
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type === 'undefined' ||
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type === 'string' ||
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type === 'number' ||
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type === 'boolean' ||
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type === 'symbol';
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};
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is.integer = Number.isInteger;
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is.plainObject = x => {
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// From: https://github.com/sindresorhus/is-plain-obj/blob/master/index.js
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let prototype;
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// eslint-disable-next-line no-return-assign
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return getObjectType(x) === 'Object' &&
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(prototype = Object.getPrototypeOf(x), prototype === null ||
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prototype === Object.getPrototypeOf({}));
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};
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is.iterable = x => !is.null(x) && !is.undefined(x) && typeof x[Symbol.iterator] === 'function';
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const typedArrayTypes = new Set([
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'Int8Array',
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'Uint8Array',
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'Uint8ClampedArray',
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'Int16Array',
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'Uint16Array',
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'Int32Array',
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'Uint32Array',
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'Float32Array',
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'Float64Array'
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]);
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is.typedArray = x => typedArrayTypes.has(getObjectType(x));
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module.exports = is;
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