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21 lines
564 B
21 lines
564 B
var coreJsData = require('./_coreJsData');
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/** Used to detect methods masquerading as native. */
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var maskSrcKey = (function() {
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var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
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return uid ? ('Symbol(src)_1.' + uid) : '';
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}());
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/**
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* Checks if `func` has its source masked.
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*
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* @private
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* @param {Function} func The function to check.
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* @returns {boolean} Returns `true` if `func` is masked, else `false`.
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*/
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function isMasked(func) {
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return !!maskSrcKey && (maskSrcKey in func);
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}
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module.exports = isMasked;
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