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atom / usr / share / atom / resources / app / apm / node_modules / es6-weak-map / is-implemented.js
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'use strict';

module.exports = function () {
	var map;
	if (typeof WeakMap !== 'function') return false;
	map = new WeakMap();
	if (typeof map.set !== 'function') return false;
	if (map.set({}, 1) !== map) return false;
	if (typeof map.clear !== 'function') return false;
	if (typeof map.delete !== 'function') return false;
	if (typeof map.has !== 'function') return false;

	return true;
};