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node_modules/es5-ext/object/copy-deep.js

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+"use strict";
+
+var forEach       = require("./for-each")
+  , isPlainObject = require("./is-plain-object")
+  , ensureValue   = require("./valid-value")
+  , isArray       = Array.isArray;
+
+var copyValue = function (value, ancestors, ancestorsCopy) {
+	var mode;
+	if (isPlainObject(value)) mode = "object";
+	else if (isArray(value)) mode = "array";
+	if (!mode) return value;
+
+	var copy = ancestorsCopy[ancestors.indexOf(value)];
+	if (copy) return copy;
+	copy = mode === "object" ? {} : [];
+
+	ancestors.push(value);
+	ancestorsCopy.push(copy);
+	if (mode === "object") {
+		forEach(value, function (item, key) {
+			copy[key] = copyValue(item, ancestors, ancestorsCopy);
+		});
+	} else {
+		value.forEach(function (item, index) {
+			copy[index] = copyValue(item, ancestors, ancestorsCopy);
+		});
+	}
+	ancestors.pop();
+	ancestorsCopy.pop();
+
+	return copy;
+};
+
+module.exports = function (source) { return copyValue(ensureValue(source), [], []); };