Add definitions for clean-css (https://github.com/jakubpawlowicz/clean-css)

clean-css/clean-css-tests.ts

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+/// <reference path="clean-css.d.ts" />
+
+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, target: 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: inputSourceMapAsString, target: pathToOutputDirectory })
+  .minify(source, 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(minified.sourceMap);
+});
+
+new CleanCSS({ sourceMap: true, target: 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'
+  }
+});

clean-css/clean-css.d.ts

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+// Type definitions for clean-css v3.4.9
+// Project: https://github.com/jakubpawlowicz/clean-css
+// Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module 'clean-css' {
+  namespace CleanCSS {
+    interface Options {
+      // Set to false to disable advanced optimizations - selector & property merging, reduction, etc.
+      advanced?: boolean;
+
+      // Set to false to disable aggressive merging of properties.
+      aggressiveMerging?: boolean;
+
+      // Turns on benchmarking mode measuring time spent on cleaning up (run npm run bench to see example)
+      benchmark?: boolean;
+
+      // Enables compatibility mode
+      compatibility?: Object;
+
+      // Set to true to get minification statistics under stats property (see test/custom-test.js for examples)
+      debug?: boolean;
+
+      // A hash of options for @import inliner, see test/protocol-imports-test.js for examples, or this comment for a proxy use case.
+      inliner?: Object;
+
+      // Whether to keep line breaks (default is false)
+      keepBreaks?: boolean;
+
+      // * for keeping all (default), 1 for keeping first one only, 0 for removing all
+      keepSpecialComments?: string | number;
+
+      // Whether to merge @media at-rules (default is true)
+      mediaMerging?: boolean;
+
+      // Whether to process @import rules
+      processImport?: boolean;
+
+      // A list of @import rules, can be ['all'] (default), ['local'], ['remote'], or a blacklisted path e.g. ['!fonts.googleapis.com']
+      processImportFrom?: Array<string>;
+
+      // Set to false to skip URL rebasing
+      rebase?: boolean;
+
+      // Path to resolve relative @import rules and URLs
+      relativeTo?: string;
+
+      // Set to false to disable restructuring in advanced optimizations
+      restructuring?: boolean;
+
+      // Path to resolve absolute @import rules and rebase relative URLs
+      root?: string;
+
+      // Rounding precision; defaults to 2; -1 disables rounding
+      roundingPrecision?: number;
+
+      // Set to true to enable semantic merging mode which assumes BEM-like content (default is false as it's highly likely this will break your stylesheets - use with caution!)
+      semanticMerging?: boolean;
+
+      // Set to false to skip shorthand compacting (default is true unless sourceMap is set when it's false)
+      shorthandCompacting?: boolean;
+
+      // Exposes source map under sourceMap property, e.g. new CleanCSS().minify(source).sourceMap (default is false) If input styles are a product of CSS preprocessor (Less, Sass) an input source map can be passed as a string.
+      sourceMap?: boolean | string;
+
+      // Set to true to inline sources inside a source map's sourcesContent field (defaults to false) It is also required to process inlined sources from input source maps.
+      sourceMapInlineSources?: boolean;
+
+      // Path to a folder or an output file to which rebase all URLs
+      target?: string;
+    }
+
+    interface Output {
+      // Optimized output CSS as a string
+      styles: string;
+
+      // Output source map (if requested with sourceMap option)
+      sourceMap: string;
+
+      // A list of errors raised
+      errors: Array<string>;
+
+      // A list of warnings raised
+      warnings: Array<string>;
+
+      // A hash of statistic information (if requested with debug option)
+      stats: {
+        // Original content size (after import inlining)
+        originalSize: number;
+
+        // Optimized content size
+        minifiedSize: number;
+
+        // Time spent on optimizations
+        timeSpent: number;
+
+        // A ratio of output size to input size (e.g. 25% if content was reduced from 100 bytes to 75 bytes)
+        efficiency: number;
+      };
+    }
+  }
+
+  class CleanCSS {
+    constructor(options?: CleanCSS.Options);
+    minify(sources: string | Array<string> | Object, callback?: (error: any, minified: CleanCSS.Output) => void): CleanCSS.Output;
+  }
+
+  export = CleanCSS;
+}