Create type definition for object-keys module (#27307)

types/object-keys/index.d.ts

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+// Type definitions for object-keys 1.0
+// Project: https://github.com/ljharb/object-keys#readme
+// Definitions by: Vitor Luiz Cavalcanti <https://github.com/VitorLuizC>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+declare function objectKeys(object: object): string[];
+
+declare namespace objectKeys {
+    function shim(): typeof objectKeys;
+}
+
+export = objectKeys;

types/object-keys/object-keys-tests.ts

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+import keys = require('object-keys');
+
+keys({ A: 1, B: 2, C: 3 });
+// => string[]
+
+keys.shim();
+// typeof keys
+
+keys([ 0, 1, 2, 3 ]);
+// => string[]
+
+keys(() => 0);
+// => string[]
+
+function testArguments() {
+    keys(arguments);
+}

types/object-keys/tsconfig.json

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

types/object-keys/tslint.json

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