Add definitions for mockdate package (#13754)

* Add mockdate package definition file

* Fix mockdate comments

* Apply revision checks on mockdate

Add tslint.json
Enable strciNullChecks
Change definition to export functions intead of default.

* Fix mockdate to export as namespace

mockdate/index.d.ts

@@ -0,0 +1,18 @@
+// Type definitions for mockdate 2.0
+// Project: https://github.com/boblauer/MockDate
+// Definitions by: Bruno Leonardo Michels <https://github.com/brunolm>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export as namespace MockDate;
+
+/**
+ * Change the Date implementation to mock a specific date.
+ * @param Date to be set as current
+ * @param timezoneOffset? The value that should be returned by new Date().getTimezoneOffset()
+ */
+export function set(date: { valueOf(): number; } | number | string, timezoneOffset?: number): void;
+
+/**
+ * Restore the original Date object back to the native implementation.
+ */
+export function reset(): void;

mockdate/mockdate-tests.ts

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+import * as mockdate from 'mockdate';
+
+mockdate.set(new Date());
+mockdate.set('2017-01-05');
+mockdate.set(new Date().getTime());
+
+mockdate.set(new Date(), 0);
+
+mockdate.reset();

mockdate/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "mockdate-tests.ts"
+    ]
+}

mockdate/tslint.json

@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }