14 lines
403 B
JavaScript
14 lines
403 B
JavaScript
"use strict";
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var toStringTagSymbol = require("es6-symbol").toStringTag
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, objToString = Object.prototype.toString
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, id = "[object WeakMap]"
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, Global = typeof WeakMap === "undefined" ? null : WeakMap;
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module.exports = function (value) {
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return (value && ((Global && (value instanceof Global)) ||
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(objToString.call(value) === id) || (value[toStringTagSymbol] === "WeakMap"))) ||
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false;
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};
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