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