50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
'use strict';
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var forEach = require('es5-ext/object/for-each')
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, validValue = require('es5-ext/object/valid-object')
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, push = Array.prototype.apply, defineProperty = Object.defineProperty
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, create = Object.create, hasOwnProperty = Object.prototype.hasOwnProperty
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, d = { configurable: true, enumerable: false, writable: true };
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module.exports = function (e1, e2) {
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var data;
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(validValue(e1) && validValue(e2));
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if (!hasOwnProperty.call(e1, '__ee__')) {
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if (!hasOwnProperty.call(e2, '__ee__')) {
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d.value = create(null);
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defineProperty(e1, '__ee__', d);
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defineProperty(e2, '__ee__', d);
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d.value = null;
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return;
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}
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d.value = e2.__ee__;
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defineProperty(e1, '__ee__', d);
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d.value = null;
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return;
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}
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data = d.value = e1.__ee__;
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if (!hasOwnProperty.call(e2, '__ee__')) {
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defineProperty(e2, '__ee__', d);
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d.value = null;
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return;
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}
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if (data === e2.__ee__) return;
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forEach(e2.__ee__, function (listener, name) {
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if (!data[name]) {
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data[name] = listener;
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return;
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}
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if (typeof data[name] === 'object') {
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if (typeof listener === 'object') push.apply(data[name], listener);
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else data[name].push(listener);
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} else if (typeof listener === 'object') {
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listener.unshift(data[name]);
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data[name] = listener;
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} else {
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data[name] = [data[name], listener];
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}
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});
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defineProperty(e2, '__ee__', d);
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d.value = null;
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};
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