add definition and test for merge-descriptor

merge-descriptors/merge-descriptors-tests.ts

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+/// <reference path="merge-descriptors.d.ts"/>
+import mixin = require('merge-descriptors');
+
+function testAssertion(condition: boolean, errorMessage: string) {
+    if (!condition) {
+        throw new Error(errorMessage);
+    }
+}
+
+interface IMergedObject {
+    InSrc?: string;
+    name: string;
+    InTarget: string;
+}
+
+var src = {
+    InSrc: 'src',
+    get name(): string {
+        return 'from src name';
+    }
+}
+
+var target: IMergedObject = { name: 'my target name', InTarget: 'target' };
+
+var target2 = mixin(target, src, true);
+
+console.log(JSON.stringify(target));
+
+testAssertion(target2 === target, "Returned object should refer to input [destination] object");
+testAssertion(target.name === 'from src name', "[redfine]=true, source member will overwrite destination member");
+testAssertion(target.InTarget === 'target', "overwrite do not affect members only in [destination]");
+testAssertion(target['InSrc'] === 'src', "members from [source] must be copied to [destination]");
+
+var nameProperty:PropertyDescriptor = Object.getOwnPropertyDescriptor(target, "name");
+testAssertion(nameProperty.set === undefined, "member descriptor must be overwritten");

merge-descriptors/merge-descriptors-tests.ts.tscparams

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+--noImplicitAny --module commonjs --target es5

merge-descriptors/merge-descriptors.d.ts

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+// Type definitions for merge-descriptors
+// Project: https://github.com/component/merge-descriptors
+// Definitions by: Zhiyuan Wang <https://github.com/danny8002/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'merge-descriptors' {
+
+    function merge(destination: Object, source: Object): Object;
+
+    function merge(destination: Object, source: Object, redefine: boolean): Object;
+
+    export = merge;
+}