[just-clone] Adding new Typings for just-clone module (#39996)

* Typings for just-clone

* Updated tests

* Added more tests

* Moved test

types/just-clone/index.d.ts

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+// Type definitions for just-clone 3.1
+// Project: https://github.com/angus-c/just#readme
+// Definitions by: Chris Howard <https://github.com/ConnectivityChris>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+declare function clone<T extends object>(obj: T): T;
+
+export = clone;

types/just-clone/just-clone-tests.ts

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+import clone = require('just-clone');
+
+const array: string[] = [];
+const object: object = {};
+
+const arr = [1, 2, 3];
+const subObj = { aa: 1 };
+const obj = { a: 3, b: 5, c: arr, d: subObj };
+
+clone(obj); // $ExpectType { a: number; b: number; c: number[]; d: { aa: number; }; }
+clone(object); // $ExpectType object
+clone(array); // $ExpectType string[]
+clone(() => array); // $ExpectType () => string[]
+clone(() => {}); // $ExpectType () => void
+clone({ a: array }); // $ExpectType { a: string[]; }
+clone([{ a: '' }]); // $ExpectType { a: string; }[]
+
+// Incorrect types
+clone(); // $ExpectError
+clone(1); // $ExpectError
+clone(''); // $ExpectError
+clone(true); // $ExpectError
+clone(false); // $ExpectError
+clone(null); // $ExpectError
+clone(undefined); // $ExpectError

types/just-clone/tsconfig.json

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

types/just-clone/tslint.json

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+{ "extends": "dtslint/dt.json" }