Add whatwg-mimetype definition.

types/whatwg-mimetype/index.d.ts

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+// Type definitions for whatwg-mimetype 2.1
+// Project: https://github.com/jsdom/whatwg-mimetype#readme
+// Definitions by: Pete Johanson <https://github.com/petejohanson>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = MIMEType;
+
+declare class MIMEType {
+  type: string;
+  subtype: string;
+
+  readonly essence: string;
+  readonly parameters: Map<string, string>;
+
+  static parse(s: string): MIMEType | null;
+
+  constructor(s: string);
+
+  isHTML(): boolean;
+  isXML(): boolean;
+  isJavaScript(opts?: { allowParameters?: boolean }): boolean;
+}

types/whatwg-mimetype/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",
+        "whatwg-mimetype-tests.ts"
+    ]
+}

types/whatwg-mimetype/tslint.json

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

types/whatwg-mimetype/whatwg-mimetype-tests.ts

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+/// <reference types="node" />
+import assert = require("assert");
+import MIMEType = require('whatwg-mimetype');
+
+const mt = MIMEType.parse("text/plain");
+
+assert(mt !== null);
+if (mt) {
+  assert(mt.type === "text");
+  assert(mt.subtype === "plain");
+  assert(mt.essence === "text/plain");
+  assert(mt.parameters.size === 0);
+  assert(!mt.isXML());
+  assert(!mt.isHTML());
+  assert(!mt.isJavaScript());
+}
+
+const mt2 = new MIMEType("application/javascript; charset=utf8");
+
+assert(mt2.type === "text");
+assert(mt2.subtype === "plain");
+assert(mt2.essence === "text/plain");
+assert(mt2.parameters.get("charset") === "utf8");
+assert(mt2.isJavaScript({ allowParameters: true }));