diff --git a/autoprefixer-core/autoprefixer-core-tests.ts b/autoprefixer-core/autoprefixer-core-tests.ts
new file mode 100644
index 000000000..9ff4e7695
--- /dev/null
+++ b/autoprefixer-core/autoprefixer-core-tests.ts
@@ -0,0 +1,9 @@
+/// <reference path="autoprefixer-core.d.ts" />
+import autoprefixer = require("autoprefixer-core");
+
+var css: string;
+
+var prefixed = autoprefixer.process(css).css;
+
+var processor = autoprefixer({ browsers: ['> 1%', 'IE 7'], cascade: false });
+console.log(processor.info());
diff --git a/autoprefixer-core/autoprefixer-core.d.ts b/autoprefixer-core/autoprefixer-core.d.ts
new file mode 100644
index 000000000..905447acf
--- /dev/null
+++ b/autoprefixer-core/autoprefixer-core.d.ts
@@ -0,0 +1,44 @@
+// Type definitions for Autoprefixer Core 5.1.11
+// Project: https://github.com/postcss/autoprefixer-core
+// Definitions by: Asana <https://asana.com>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "autoprefixer-core" {
+    interface Config {
+        browsers?: string[];
+        cascade?: boolean;
+        remove?: boolean;
+    }
+
+    interface Options {
+        from?: string;
+        to?: string;
+        safe?: boolean;
+        map?: {
+            inline?: boolean;
+            prev?: string | Object;
+        }
+    }
+
+    interface Result {
+        css: string;
+        map: string;
+        opts: Options;
+    }
+
+    interface Processor {
+        postcss: any;
+        info(): string;
+        process(css: string, opts?: Options): Result;
+    }
+
+    interface Exports {
+        (config: Config): Processor;
+        postcss: any;
+        info(): string;
+        process(css: string, opts?: Options): Result;
+    }
+
+    var exports: Exports;
+    export = exports;
+}
diff --git a/node-sass/node-sass-tests.ts b/node-sass/node-sass-tests.ts
new file mode 100644
index 000000000..a7c1477cb
--- /dev/null
+++ b/node-sass/node-sass-tests.ts
@@ -0,0 +1,71 @@
+/// <reference path="node-sass.d.ts" />
+import sass = require('node-sass');
+sass.render({
+  file: '/path/to/myFile.scss',
+  data: 'body{background:blue; a{color:black;}}',
+  importer: function(url, prev, done) {
+    // url is the path in import as is, which libsass encountered.
+    // prev is the previously resolved path.
+    // done is an optional callback, either consume it or return value synchronously.
+    // this.options contains this options hash, this.callback contains the node-style callback
+    someAsyncFunction(url, prev, function(result) {
+      done({
+        file: result.path, // only one of them is required, see section Sepcial Behaviours.
+        contents: result.data
+      });
+    });
+    // OR
+    var result = someSyncFunction(url, prev);
+    return { file: result.path, contents: result.data };
+  },
+  includePaths: ['lib/', 'mod/'],
+  outputStyle: 'compressed'
+}, function(error, result) { // node-style callback from v3.0.0 onwards
+  if (error) {
+    console.log(error.status); // used to be "code" in v2x and below
+    console.log(error.column);
+    console.log(error.message);
+    console.log(error.line);
+  }
+  else {
+    console.log(result.css.toString());
+
+    console.log(result.stats);
+
+    console.log(result.map.toString());
+    // or better
+    console.log(JSON.stringify(result.map)); // note, JSON.stringify accepts Buffer too
+  }
+});
+// OR
+var result = sass.renderSync({
+  file: '/path/to/file.scss',
+  data: 'body{background:blue; a{color:black;}}',
+  outputStyle: 'compressed',
+  outFile: '/to/my/output.css',
+  sourceMap: true, // or an absolute or relative (to outFile) path
+  importer: function(url, prev, done) {
+    // url is the path in import as is, which libsass encountered.
+    // prev is the previously resolved path.
+    // done is an optional callback, either consume it or return value synchronously.
+    // this.options contains this options hash
+    someAsyncFunction(url, prev, function(result) {
+      done({
+        file: result.path, // only one of them is required, see section Sepcial Behaviours.
+        contents: result.data
+      });
+    });
+    // OR
+    var result = someSyncFunction(url, prev);
+    return { file: result.path, contents: result.data };
+  },
+});
+
+console.log(result.css);
+console.log(result.map);
+console.log(result.stats);
+
+function someAsyncFunction(url: string, prev: string, callback: (result: { path: string; data: string }) => void): void {}
+function someSyncFunction(url: string, prev: string): { path: string; data: string} {
+  return null;
+}
diff --git a/node-sass/node-sass.d.ts b/node-sass/node-sass.d.ts
new file mode 100644
index 000000000..09ea71d4e
--- /dev/null
+++ b/node-sass/node-sass.d.ts
@@ -0,0 +1,56 @@
+// Type definitions for Node Sass
+// Project: https://github.com/sass/node-sass
+// Definitions by: Asana <https://asana.com>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "node-sass" {
+    interface Importer {
+        (url: string, prev: string, done: (data: { file: string; contents: string; }) => void): void;
+    }
+
+    interface Options {
+        file?: string;
+        data?: string;
+        importer?: Importer | Importer[];
+        functions?: { [key: string]: Function };
+        includePaths?: string[];
+        indentedSyntax?: boolean;
+        indentType?: string;
+        indentWidth?: number;
+        linefeed?: string;
+        omitSourceMapUrl?: boolean;
+        outFile?: string;
+        outputStyle?: string;
+        precision?: number;
+        sourceComments?: boolean;
+        sourceMap?: boolean | string;
+        sourceMapContents?: boolean;
+        sourceMapEmbed?: boolean;
+        sourceMapRoot?: boolean;
+    }
+
+    interface SassError extends Error {
+        message: string;
+        line: number;
+        column: number;
+        status: number;
+        file: string;
+    }
+
+    interface Result {
+        css: Buffer;
+        map: Buffer;
+        stats: {
+            entry: string;
+            start: number;
+            end: number;
+            duration: number;
+            includedFiles: string[];
+        }
+    }
+
+    export function render(options: Options, callback: (err: SassError, result: Result) => any): void;
+    export function renderSync(options: Options): Result;
+}