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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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