diff --git a/types/clean-css/clean-css-tests.ts b/types/clean-css/clean-css-tests.ts
deleted file mode 100644
index 7333424f11..0000000000
--- a/types/clean-css/clean-css-tests.ts
+++ /dev/null
@@ -1,54 +0,0 @@
-
-import * as CleanCSS from 'clean-css';
-
-var source = 'a{font-weight:bold;}';
-var minified = new CleanCSS().minify(source).styles;
-
-var source = '@import url(http://path/to/remote/styles);';
-new CleanCSS().minify(source, function (error, minified) {
-  console.log(minified.styles);
-});
-
-const pathToOutputDirectory = 'path';
-
-new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory })
-  .minify(source, function (error, minified) {
-    // access minified.sourceMap for SourceMapGenerator object
-    // see https://github.com/mozilla/source-map/#sourcemapgenerator for more details
-    // see https://github.com/jakubpawlowicz/clean-css/blob/master/bin/cleancss#L114 on how it's used in clean-css' CLI
-    console.log(minified.sourceMap);
-});
-
-const inputSourceMapAsString = 'input';
-new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory })
-  .minify(source, inputSourceMapAsString, function (error, minified) {
-    // access minified.sourceMap to access SourceMapGenerator object
-    // see https://github.com/mozilla/source-map/#sourcemapgenerator for more details
-    // see https://github.com/jakubpawlowicz/clean-css/blob/master/bin/cleancss#L114 on how it's used in clean-css' CLI
-    console.log();
-});
-
-new CleanCSS({ sourceMap: true, rebaseTo: pathToOutputDirectory }).minify({
-  'path/to/source/1': {
-    styles: '...styles...',
-    sourceMap: '...source-map...'
-  },
-  'path/to/source/2': {
-    styles: '...styles...',
-    sourceMap: '...source-map...'
-  }
-}, function (error, minified) {
-  // access minified.sourceMap as above
-  console.log(minified.sourceMap);
-});
-
-new CleanCSS().minify(['path/to/file/one', 'path/to/file/two']);
-
-new CleanCSS().minify({
-  'path/to/file/one': {
-    styles: 'contents of file one'
-  },
-  'path/to/file/two': {
-    styles: 'contents of file two'
-  }
-});
diff --git a/types/clean-css/index.d.ts b/types/clean-css/index.d.ts
index 9c32ba8396..b8b52086f6 100644
--- a/types/clean-css/index.d.ts
+++ b/types/clean-css/index.d.ts
@@ -13,17 +13,19 @@ declare namespace CleanCSS {
      */
     interface Options {
         /**
-         * Controls compatibility mode used; defaults to ie10+ using `'*'`
+         * Controls compatibility mode used; defaults to ie10+ using `'*'`.
+         *  Compatibility hash exposes the following properties: `colors`, `properties`, `selectors`, and `units`
          */
         compatibility?: "*" | "ie9" | "ie8" | "ie7" | CompatibilityOptions;
 
         /**
          * Controls a function for handling remote requests; Defaults to the build in `loadRemoteResource` function
          */
-        fetch?: (uri: string, inlineRequest: HttpRequestOptions | HttpsRequestOptions, inlineTimeout: number, callback: FetchCallback) => void;
+        fetch?: (uri: string, inlineRequest: HttpRequestOptions | HttpsRequestOptions, inlineTimeout: number, done: (message: string | number, body: string) => void) => void;
 
         /**
-         * Controls output CSS formatting; defaults to `false`
+         * Controls output CSS formatting; defaults to `false`.
+         *  Format hash exposes the following properties: `breaks`, `breakWith`, `indentBy`, `indentWith`, `spaces`, and `wrapAt`.
          */
         format?: "beautify" | "keep-breaks" | Format | false;
 
@@ -50,7 +52,8 @@ declare namespace CleanCSS {
         inlineTimeout?: number;
 
         /**
-         * Controls optimization level used; defaults to `1`
+         * Controls optimization level used; defaults to `1`.
+         * Level hash exposes `1`, and `2`.
          */
         level?: 0 | 1 | 2 | optimizationsOptions;
 
@@ -98,12 +101,12 @@ declare namespace CleanCSS {
         /**
          * A list of errors raised
          */
-        errors: Array<string>;
+        errors: string[];
 
         /**
          * A list of warnings raised
          */
-        warnings: Array<string>;
+        warnings: string[];
 
         /**
          * Contains statistics on the minify process
@@ -516,7 +519,7 @@ declare namespace CleanCSS {
             /**
              * Defines a callback for fine-grained property optimization; defaults to no-op
              */
-            transform?: (propertyName: string, propertyValue: string, selector: string) => string;
+            transform?: (propertyName: string, propertyValue: string, selector?: string) => string;
         },
         2?: {
             /**
@@ -602,7 +605,7 @@ declare namespace CleanCSS {
     type FetchCallback = (message: string | number, body: string) => void;
 
     /**
-     * 
+     * Interface exposed when a new CleanCSS option is created
      */
     interface Function<T extends (Output | Promise<Output>)> {
         minify(sources: string | Array<string> | Object, callback?: (error: any, output: T) => void): T;
@@ -610,15 +613,17 @@ declare namespace CleanCSS {
         minify(sources: string | Array<string> | Object, inputSourceMap?: string, callback?: (error: any, output: T) => void): T;
     }
 
+    /**
+     * Constructor interface for CleanCSS
+     */
     interface Constructor {
-        new(options: CleanCSS.Options & { returnPromise?: false }): Function<Output>;
         new(options: CleanCSS.Options & { returnPromise: true }): Function<Promise<Output>>;
-        new(): Function<Output>;
+        new(options?: CleanCSS.Options): Function<Output>;
     }
 }
 
 /**
- * 
+ * Creates a new CleanCSS object
  */
 declare const CleanCSS: CleanCSS.Constructor;
 
diff --git a/types/clean-css/tsconfig.json b/types/clean-css/tsconfig.json
index fe65b21c11..82e6284376 100644
--- a/types/clean-css/tsconfig.json
+++ b/types/clean-css/tsconfig.json
@@ -18,7 +18,6 @@
         "forceConsistentCasingInFileNames": true
     },
     "files": [
-        "index.d.ts",
-        "clean-css-tests.ts"
+        "index.d.ts"
     ]
 }
\ No newline at end of file