Add typings for 'util.promisify' package

types/util.promisify/index.d.ts

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+// Type definitions for util.promisify 1.0
+// Project: https://github.com/ljharb/util.promisify#readme
+// Definitions by: Adam Voss <https://github.com/adamvoss>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/*~ Note that ES6 modules cannot directly export callable functions.
+ *~ This file should be imported using the CommonJS-style:
+ *~   import x = require('util.promisify');
+ *~
+ *~ Refer to the documentation to understand common
+ *~ workarounds for this limitation of ES6 modules.
+ */
+export = promisify;
+
+declare function promisify(f: (...args: any[]) => void): (...args: any[]) => Promise<any>;
+
+declare namespace promisify {
+    interface implementation {
+        (fn: (...args: any[]) => void): (...args: any[]) => Promise<any>;
+        custom: symbol;
+        customPromisifyArgs: symbol | undefined;
+    }
+
+    const custom: symbol;
+    const customPromisifyArgs: symbol;
+    function getPolyfill(): implementation;
+    const implementation: implementation;
+    function shim(): implementation;
+}
+
+declare module "util" {
+    let promisify: {
+        (fn: (...args: any[]) => void): (...args: any[]) => Promise<any>;
+        custom: symbol;
+    };
+}

types/util.promisify/tsconfig.json

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

types/util.promisify/tslint.json

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

types/util.promisify/util.promisify-tests.ts

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+/// <reference types="node/v0" />
+
+import * as util from 'util';
+import * as fs from "fs";
+import promisify = require('util.promisify');
+
+// tslint:disable-next-line ban-types
+let readFile: Function = promisify(fs.readFile);
+
+promisify.shim();
+readFile = util.promisify(fs.readFile);