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34 lines
996 B
34 lines
996 B
'use strict';
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var value = require('./valid-value')
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, mixin = require('./mixin')
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, defineProperty = Object.defineProperty
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, getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor
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, getOwnPropertyNames = Object.getOwnPropertyNames
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, getPrototypeOf = Object.getPrototypeOf
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, hasOwnProperty = Object.prototype.hasOwnProperty;
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module.exports = function (target, source) {
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var error, end, define;
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target = Object(value(target));
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source = Object(value(source));
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end = getPrototypeOf(target);
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if (source === end) return target;
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try {
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mixin(target, source);
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} catch (e) { error = e; }
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source = getPrototypeOf(source);
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define = function (name) {
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if (hasOwnProperty.call(target, name)) return;
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try {
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defineProperty(target, name, getOwnPropertyDescriptor(source, name));
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} catch (e) { error = e; }
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};
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while (source && (source !== end)) {
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getOwnPropertyNames(source).forEach(define);
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source = getPrototypeOf(source);
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}
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if (error) throw error;
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return target;
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};
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