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53 lines
1.6 KiB
JavaScript
53 lines
1.6 KiB
JavaScript
import baseGetTag from './baseGetTag.js'
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import toSource from './toSource.js'
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/** `Object#toString` result references. */
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const dataViewTag = '[object DataView]'
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const mapTag = '[object Map]'
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const objectTag = '[object Object]'
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const promiseTag = '[object Promise]'
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const setTag = '[object Set]'
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const weakMapTag = '[object WeakMap]'
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/** Used to detect maps, sets, and weakmaps. */
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const dataViewCtorString = toSource(DataView)
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const mapCtorString = toSource(Map)
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const promiseCtorString = toSource(Promise)
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const setCtorString = toSource(Set)
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const weakMapCtorString = toSource(WeakMap)
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/**
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* Gets the `toStringTag` of `value`.
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*
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* @private
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* @param {*} value The value to query.
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* @returns {string} Returns the `toStringTag`.
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*/
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let getTag = baseGetTag
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// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
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if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
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(getTag(new Map) != mapTag) ||
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(getTag(Promise.resolve()) != promiseTag) ||
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(getTag(new Set) != setTag) ||
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(getTag(new WeakMap) != weakMapTag)) {
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getTag = value => {
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const result = baseGetTag(value)
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const Ctor = result == objectTag ? value.constructor : undefined
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const ctorString = Ctor ? toSource(Ctor) : ''
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if (ctorString) {
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switch (ctorString) {
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case dataViewCtorString: return dataViewTag
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case mapCtorString: return mapTag
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case promiseCtorString: return promiseTag
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case setCtorString: return setTag
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case weakMapCtorString: return weakMapTag
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}
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}
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return result
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}
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}
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export default getTag
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