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@@ -0,0 +1,69 @@
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+'use strict';
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+var isObj = require('is-obj');
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+
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+var hasOwnProperty = Object.prototype.hasOwnProperty;
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+var propIsEnumerable = Object.prototype.propertyIsEnumerable;
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+
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+function toObject(val) {
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+ if (val === null || val === undefined) {
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+ throw new TypeError('Cannot convert undefined or null to object');
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+ }
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+
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+ return Object(val);
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+}
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+
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+function assignKey(to, from, key) {
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+ var val = from[key];
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+
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+ if (val === undefined || val === null) {
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+ return;
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+ }
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+
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+ if (hasOwnProperty.call(to, key)) {
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+ if (to[key] === undefined || to[key] === null) {
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+ throw new TypeError('Cannot convert undefined or null to object (' + key + ')');
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+ }
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+ }
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+
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+ if (!hasOwnProperty.call(to, key) || !isObj(val)) {
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+ to[key] = val;
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+ } else {
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+ to[key] = assign(Object(to[key]), from[key]);
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+ }
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+}
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+
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+function assign(to, from) {
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+ if (to === from) {
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+ return to;
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+ }
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+
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+ from = Object(from);
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+
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+ for (var key in from) {
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+ if (hasOwnProperty.call(from, key)) {
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+ assignKey(to, from, key);
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+ }
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+ }
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+
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+ if (Object.getOwnPropertySymbols) {
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+ var symbols = Object.getOwnPropertySymbols(from);
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+
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+ for (var i = 0; i < symbols.length; i++) {
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+ if (propIsEnumerable.call(from, symbols[i])) {
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+ assignKey(to, from, symbols[i]);
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+ }
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+ }
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+ }
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+
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+ return to;
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+}
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+
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+module.exports = function deepAssign(target) {
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+ target = toObject(target);
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+
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+ for (var s = 1; s < arguments.length; s++) {
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+ assign(target, arguments[s]);
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+ }
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+
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+ return target;
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+};
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