/usr/lib/nodejs/type-detect/index.js is in node-type-detect 4.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* !
* type-detect
* Copyright(c) 2013 jake luer <jake@alogicalparadox.com>
* MIT Licensed
*/
var promiseExists = typeof Promise === 'function';
var globalObject = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : self; // eslint-disable-line
var isDom = 'location' in globalObject && 'document' in globalObject;
var symbolExists = typeof Symbol !== 'undefined';
var mapExists = typeof Map !== 'undefined';
var setExists = typeof Set !== 'undefined';
var weakMapExists = typeof WeakMap !== 'undefined';
var weakSetExists = typeof WeakSet !== 'undefined';
var dataViewExists = typeof DataView !== 'undefined';
var symbolIteratorExists = symbolExists && typeof Symbol.iterator !== 'undefined';
var symbolToStringTagExists = symbolExists && typeof Symbol.toStringTag !== 'undefined';
var setEntriesExists = setExists && typeof Set.prototype.entries === 'function';
var mapEntriesExists = mapExists && typeof Map.prototype.entries === 'function';
var setIteratorPrototype = setEntriesExists && Object.getPrototypeOf(new Set().entries());
var mapIteratorPrototype = mapEntriesExists && Object.getPrototypeOf(new Map().entries());
var arrayIteratorExists = symbolIteratorExists && typeof Array.prototype[Symbol.iterator] === 'function';
var arrayIteratorPrototype = arrayIteratorExists && Object.getPrototypeOf([][Symbol.iterator]());
var stringIteratorExists = symbolIteratorExists && typeof Array.prototype[Symbol.iterator] === 'function';
var stringIteratorPrototype = stringIteratorExists && Object.getPrototypeOf(''[Symbol.iterator]());
var toStringLeftSliceLength = 8;
var toStringRightSliceLength = -1;
/**
* ### typeOf (obj)
*
* Uses `Object.prototype.toString` to determine the type of an object,
* normalising behaviour across engine versions & well optimised.
*
* @param {Mixed} object
* @return {String} object type
* @api public
*/
module.exports = function typeDetect(obj) {
/* ! Speed optimisation
* Pre:
* string literal x 3,039,035 ops/sec ±1.62% (78 runs sampled)
* boolean literal x 1,424,138 ops/sec ±4.54% (75 runs sampled)
* number literal x 1,653,153 ops/sec ±1.91% (82 runs sampled)
* undefined x 9,978,660 ops/sec ±1.92% (75 runs sampled)
* function x 2,556,769 ops/sec ±1.73% (77 runs sampled)
* Post:
* string literal x 38,564,796 ops/sec ±1.15% (79 runs sampled)
* boolean literal x 31,148,940 ops/sec ±1.10% (79 runs sampled)
* number literal x 32,679,330 ops/sec ±1.90% (78 runs sampled)
* undefined x 32,363,368 ops/sec ±1.07% (82 runs sampled)
* function x 31,296,870 ops/sec ±0.96% (83 runs sampled)
*/
var typeofObj = typeof obj;
if (typeofObj !== 'object') {
return typeofObj;
}
/* ! Speed optimisation
* Pre:
* null x 28,645,765 ops/sec ±1.17% (82 runs sampled)
* Post:
* null x 36,428,962 ops/sec ±1.37% (84 runs sampled)
*/
if (obj === null) {
return 'null';
}
/* ! Spec Conformance
* Test: `Object.prototype.toString.call(window)``
* - Node === "[object global]"
* - Chrome === "[object global]"
* - Firefox === "[object Window]"
* - PhantomJS === "[object Window]"
* - Safari === "[object Window]"
* - IE 11 === "[object Window]"
* - IE Edge === "[object Window]"
* Test: `Object.prototype.toString.call(this)``
* - Chrome Worker === "[object global]"
* - Firefox Worker === "[object DedicatedWorkerGlobalScope]"
* - Safari Worker === "[object DedicatedWorkerGlobalScope]"
* - IE 11 Worker === "[object WorkerGlobalScope]"
* - IE Edge Worker === "[object WorkerGlobalScope]"
*/
if (obj === globalObject) {
return 'global';
}
/* ! Speed optimisation
* Pre:
* array literal x 2,888,352 ops/sec ±0.67% (82 runs sampled)
* Post:
* array literal x 22,479,650 ops/sec ±0.96% (81 runs sampled)
*/
if (Array.isArray(obj)) {
return 'Array';
}
if (isDom) {
/* ! Spec Conformance
* (https://html.spec.whatwg.org/multipage/browsers.html#location)
* WhatWG HTML$7.7.3 - The `Location` interface
* Test: `Object.prototype.toString.call(window.location)``
* - IE <=11 === "[object Object]"
* - IE Edge <=13 === "[object Object]"
*/
if (obj === globalObject.location) {
return 'Location';
}
/* ! Spec Conformance
* (https://html.spec.whatwg.org/#document)
* WhatWG HTML$3.1.1 - The `Document` object
* Note: Most browsers currently adher to the W3C DOM Level 2 spec
* (https://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-26809268)
* which suggests that browsers should use HTMLTableCellElement for
* both TD and TH elements. WhatWG separates these.
* WhatWG HTML states:
* > For historical reasons, Window objects must also have a
* > writable, configurable, non-enumerable property named
* > HTMLDocument whose value is the Document interface object.
* Test: `Object.prototype.toString.call(document)``
* - Chrome === "[object HTMLDocument]"
* - Firefox === "[object HTMLDocument]"
* - Safari === "[object HTMLDocument]"
* - IE <=10 === "[object Document]"
* - IE 11 === "[object HTMLDocument]"
* - IE Edge <=13 === "[object HTMLDocument]"
*/
if (obj === globalObject.document) {
return 'Document';
}
/* ! Spec Conformance
* (https://html.spec.whatwg.org/multipage/webappapis.html#mimetypearray)
* WhatWG HTML$8.6.1.5 - Plugins - Interface MimeTypeArray
* Test: `Object.prototype.toString.call(navigator.mimeTypes)``
* - IE <=10 === "[object MSMimeTypesCollection]"
*/
if (obj === (globalObject.navigator || {}).mimeTypes) {
return 'MimeTypeArray';
}
/* ! Spec Conformance
* (https://html.spec.whatwg.org/multipage/webappapis.html#pluginarray)
* WhatWG HTML$8.6.1.5 - Plugins - Interface PluginArray
* Test: `Object.prototype.toString.call(navigator.plugins)``
* - IE <=10 === "[object MSPluginsCollection]"
*/
if (obj === (globalObject.navigator || {}).plugins) {
return 'PluginArray';
}
/* ! Spec Conformance
* (https://html.spec.whatwg.org/multipage/webappapis.html#pluginarray)
* WhatWG HTML$4.4.4 - The `blockquote` element - Interface `HTMLQuoteElement`
* Test: `Object.prototype.toString.call(document.createElement('blockquote'))``
* - IE <=10 === "[object HTMLBlockElement]"
*/
if (obj instanceof HTMLElement && obj.tagName === 'BLOCKQUOTE') {
return 'HTMLQuoteElement';
}
/* ! Spec Conformance
* (https://html.spec.whatwg.org/#htmltabledatacellelement)
* WhatWG HTML$4.9.9 - The `td` element - Interface `HTMLTableDataCellElement`
* Note: Most browsers currently adher to the W3C DOM Level 2 spec
* (https://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-82915075)
* which suggests that browsers should use HTMLTableCellElement for
* both TD and TH elements. WhatWG separates these.
* Test: Object.prototype.toString.call(document.createElement('td'))
* - Chrome === "[object HTMLTableCellElement]"
* - Firefox === "[object HTMLTableCellElement]"
* - Safari === "[object HTMLTableCellElement]"
*/
if (obj instanceof HTMLElement && obj.tagName === 'TD') {
return 'HTMLTableDataCellElement';
}
/* ! Spec Conformance
* (https://html.spec.whatwg.org/#htmltableheadercellelement)
* WhatWG HTML$4.9.9 - The `td` element - Interface `HTMLTableHeaderCellElement`
* Note: Most browsers currently adher to the W3C DOM Level 2 spec
* (https://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-82915075)
* which suggests that browsers should use HTMLTableCellElement for
* both TD and TH elements. WhatWG separates these.
* Test: Object.prototype.toString.call(document.createElement('th'))
* - Chrome === "[object HTMLTableCellElement]"
* - Firefox === "[object HTMLTableCellElement]"
* - Safari === "[object HTMLTableCellElement]"
*/
if (obj instanceof HTMLElement && obj.tagName === 'TH') {
return 'HTMLTableHeaderCellElement';
}
}
/* ! Speed optimisation
* Pre:
* Float64Array x 625,644 ops/sec ±1.58% (80 runs sampled)
* Float32Array x 1,279,852 ops/sec ±2.91% (77 runs sampled)
* Uint32Array x 1,178,185 ops/sec ±1.95% (83 runs sampled)
* Uint16Array x 1,008,380 ops/sec ±2.25% (80 runs sampled)
* Uint8Array x 1,128,040 ops/sec ±2.11% (81 runs sampled)
* Int32Array x 1,170,119 ops/sec ±2.88% (80 runs sampled)
* Int16Array x 1,176,348 ops/sec ±5.79% (86 runs sampled)
* Int8Array x 1,058,707 ops/sec ±4.94% (77 runs sampled)
* Uint8ClampedArray x 1,110,633 ops/sec ±4.20% (80 runs sampled)
* Post:
* Float64Array x 7,105,671 ops/sec ±13.47% (64 runs sampled)
* Float32Array x 5,887,912 ops/sec ±1.46% (82 runs sampled)
* Uint32Array x 6,491,661 ops/sec ±1.76% (79 runs sampled)
* Uint16Array x 6,559,795 ops/sec ±1.67% (82 runs sampled)
* Uint8Array x 6,463,966 ops/sec ±1.43% (85 runs sampled)
* Int32Array x 5,641,841 ops/sec ±3.49% (81 runs sampled)
* Int16Array x 6,583,511 ops/sec ±1.98% (80 runs sampled)
* Int8Array x 6,606,078 ops/sec ±1.74% (81 runs sampled)
* Uint8ClampedArray x 6,602,224 ops/sec ±1.77% (83 runs sampled)
*/
var stringTag = (symbolToStringTagExists && obj[Symbol.toStringTag]);
if (typeof stringTag === 'string') {
return stringTag;
}
var objPrototype = Object.getPrototypeOf(obj);
/* ! Speed optimisation
* Pre:
* regex literal x 1,772,385 ops/sec ±1.85% (77 runs sampled)
* regex constructor x 2,143,634 ops/sec ±2.46% (78 runs sampled)
* Post:
* regex literal x 3,928,009 ops/sec ±0.65% (78 runs sampled)
* regex constructor x 3,931,108 ops/sec ±0.58% (84 runs sampled)
*/
if (objPrototype === RegExp.prototype) {
return 'RegExp';
}
/* ! Speed optimisation
* Pre:
* date x 2,130,074 ops/sec ±4.42% (68 runs sampled)
* Post:
* date x 3,953,779 ops/sec ±1.35% (77 runs sampled)
*/
if (objPrototype === Date.prototype) {
return 'Date';
}
/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-promise.prototype-@@tostringtag)
* ES6$25.4.5.4 - Promise.prototype[@@toStringTag] should be "Promise":
* Test: `Object.prototype.toString.call(Promise.resolve())``
* - Chrome <=47 === "[object Object]"
* - Edge <=20 === "[object Object]"
* - Firefox 29-Latest === "[object Promise]"
* - Safari 7.1-Latest === "[object Promise]"
*/
if (promiseExists && objPrototype === Promise.prototype) {
return 'Promise';
}
/* ! Speed optimisation
* Pre:
* set x 2,222,186 ops/sec ±1.31% (82 runs sampled)
* Post:
* set x 4,545,879 ops/sec ±1.13% (83 runs sampled)
*/
if (setExists && objPrototype === Set.prototype) {
return 'Set';
}
/* ! Speed optimisation
* Pre:
* map x 2,396,842 ops/sec ±1.59% (81 runs sampled)
* Post:
* map x 4,183,945 ops/sec ±6.59% (82 runs sampled)
*/
if (mapExists && objPrototype === Map.prototype) {
return 'Map';
}
/* ! Speed optimisation
* Pre:
* weakset x 1,323,220 ops/sec ±2.17% (76 runs sampled)
* Post:
* weakset x 4,237,510 ops/sec ±2.01% (77 runs sampled)
*/
if (weakSetExists && objPrototype === WeakSet.prototype) {
return 'WeakSet';
}
/* ! Speed optimisation
* Pre:
* weakmap x 1,500,260 ops/sec ±2.02% (78 runs sampled)
* Post:
* weakmap x 3,881,384 ops/sec ±1.45% (82 runs sampled)
*/
if (weakMapExists && objPrototype === WeakMap.prototype) {
return 'WeakMap';
}
/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-dataview.prototype-@@tostringtag)
* ES6$24.2.4.21 - DataView.prototype[@@toStringTag] should be "DataView":
* Test: `Object.prototype.toString.call(new DataView(new ArrayBuffer(1)))``
* - Edge <=13 === "[object Object]"
*/
if (dataViewExists && objPrototype === DataView.prototype) {
return 'DataView';
}
/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%mapiteratorprototype%-@@tostringtag)
* ES6$23.1.5.2.2 - %MapIteratorPrototype%[@@toStringTag] should be "Map Iterator":
* Test: `Object.prototype.toString.call(new Map().entries())``
* - Edge <=13 === "[object Object]"
*/
if (mapExists && objPrototype === mapIteratorPrototype) {
return 'Map Iterator';
}
/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%setiteratorprototype%-@@tostringtag)
* ES6$23.2.5.2.2 - %SetIteratorPrototype%[@@toStringTag] should be "Set Iterator":
* Test: `Object.prototype.toString.call(new Set().entries())``
* - Edge <=13 === "[object Object]"
*/
if (setExists && objPrototype === setIteratorPrototype) {
return 'Set Iterator';
}
/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%arrayiteratorprototype%-@@tostringtag)
* ES6$22.1.5.2.2 - %ArrayIteratorPrototype%[@@toStringTag] should be "Array Iterator":
* Test: `Object.prototype.toString.call([][Symbol.iterator]())``
* - Edge <=13 === "[object Object]"
*/
if (arrayIteratorExists && objPrototype === arrayIteratorPrototype) {
return 'Array Iterator';
}
/* ! Spec Conformance
* (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%stringiteratorprototype%-@@tostringtag)
* ES6$21.1.5.2.2 - %StringIteratorPrototype%[@@toStringTag] should be "String Iterator":
* Test: `Object.prototype.toString.call(''[Symbol.iterator]())``
* - Edge <=13 === "[object Object]"
*/
if (stringIteratorExists && objPrototype === stringIteratorPrototype) {
return 'String Iterator';
}
/* ! Speed optimisation
* Pre:
* object from null x 2,424,320 ops/sec ±1.67% (76 runs sampled)
* Post:
* object from null x 5,838,000 ops/sec ±0.99% (84 runs sampled)
*/
if (objPrototype === null) {
return 'Object';
}
return Object
.prototype
.toString
.call(obj)
.slice(toStringLeftSliceLength, toStringRightSliceLength);
};
module.exports.typeDetect = module.exports;
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