Add type definitions for punycode.js

Since January 19th ([1]), the `punycode` package has also been published
under `punycode.js`. This solves the problem of needing to use
`punycode/` to use the package (as `punycode` is a built-in Node
package). However, types are missing for `punycode.js`. So this commit
adds them. Note that the interface for the package hasn't changed since
v2.1, so I didn't bump the version, just copied the existing type
definitions from `punycode`.

[1]: mathiasbynens/punycode.js#122

types/punycode.js/index.d.ts

@@ -0,0 +1,16 @@
+// Type definitions for punycode.js 2.1
+// Project: https://mths.be/punycode
+// Definitions by: Dmitry Guketlev <https://github.com/yavanosta>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export function decode(input: string): string;
+export function encode(input: string): string;
+export function toUnicode(input: string): string;
+export function toASCII(input: string): string;
+
+export namespace ucs2 {
+    function decode(string: string): number[];
+    function encode(array: ReadonlyArray<number>): string;
+}
+
+export const version: string;

types/punycode.js/punycode.js-tests.ts

@@ -0,0 +1,11 @@
+import punycode = require('punycode.js');
+
+const result1: string = punycode.decode('x');
+const result2: string = punycode.encode('x');
+const result3: string = punycode.toASCII('x');
+const result4: string = punycode.toUnicode('x');
+
+const ucs2result1: number[] = punycode.ucs2.decode('x');
+const ucs2result2: string = punycode.ucs2.encode([1, 2, 3]);
+
+const version: string = punycode.version;

types/punycode.js/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "punycode.js-tests.ts"
+    ]
+}

types/punycode.js/tslint.json

@@ -0,0 +1 @@
+{ "extends": "@definitelytyped/dtslint/dt.json" }