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Editing: _methodFingerprint.js
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import getLength from './_getLength.js'; import isFunction from './isFunction.js'; import allKeys from './allKeys.js'; // Since the regular `Object.prototype.toString` type tests don't work for // some types in IE 11, we use a fingerprinting heuristic instead, based // on the methods. It's not great, but it's the best we got. // The fingerprint method lists are defined below. export function ie11fingerprint(methods) { var length = getLength(methods); return function(obj) { if (obj == null) return false; // `Map`, `WeakMap` and `Set` have no enumerable keys. var keys = allKeys(obj); if (getLength(keys)) return false; for (var i = 0; i < length; i++) { if (!isFunction(obj[methods[i]])) return false; } // If we are testing against `WeakMap`, we need to ensure that // `obj` doesn't have a `forEach` method in order to distinguish // it from a regular `Map`. return methods !== weakMapMethods || !isFunction(obj[forEachName]); }; } // In the interest of compact minification, we write // each string in the fingerprints only once. var forEachName = 'forEach', hasName = 'has', commonInit = ['clear', 'delete'], mapTail = ['get', hasName, 'set']; // `Map`, `WeakMap` and `Set` each have slightly different // combinations of the above sublists. export var mapMethods = commonInit.concat(forEachName, mapTail), weakMapMethods = commonInit.concat(mapTail), setMethods = ['add'].concat(commonInit, forEachName, hasName);
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