Type definitions for sass-webpack-plugin 1.0.0 (#23898)

* finish

* add tslint

* pass lint

* fix some error

* fix export error

types/sass-webpack-plugin/index.d.ts

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+// Type definitions for sass-webpack-plugin 1.0
+// Project: https://github.com/jalkoby/sass-webpack-plugin
+// Definitions by: AEPKILL <https://github.com/AepKill>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+import { Options } from 'node-sass';
+import { Plugin } from 'webpack';
+
+declare namespace SassPlugin {
+  type NODE_ENV = 'production' | 'development';
+  type FileRule = string | string[] | { [key: string]: string };
+  interface Config {
+    sourceMap?: boolean;
+    autoprefixer?: boolean;
+    sass?: Options;
+  }
+}
+
+declare class SassPlugin extends Plugin {
+  constructor(
+    file: SassPlugin.FileRule,
+    mode?: SassPlugin.NODE_ENV | SassPlugin.Config
+  );
+  constructor(
+    file: SassPlugin.FileRule,
+    mode: SassPlugin.NODE_ENV,
+    config?: SassPlugin.Config
+  );
+}
+
+export = SassPlugin;

types/sass-webpack-plugin/sass-webpack-plugin-tests.ts

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+import SassPlugin = require('sass-webpack-plugin');
+
+type NODE_ENV = SassPlugin.NODE_ENV;
+
+const env = process.env.NODE_ENV as NODE_ENV;
+
+new SassPlugin('./src/styles/index.scss');
+
+// production ready
+new SassPlugin('./src/styles/index.scss', env);
+
+// multi files
+new SassPlugin(['./src/styles/one.scss', './src/styles/two.sass'], env);
+
+// a different output filename
+new SassPlugin({ './src/styles/index.scss': 'bundle.css' }, env);
+
+// with sass tuning
+new SassPlugin('./src/styles/index.scss', env, {
+  sass: {
+    includePaths: ['node_modules/bootstrap-sass/assets/stylesheets']
+  }
+});
+
+// with source maps + compressing - autoprefixing
+new SassPlugin('./src/styles/index.scss', {
+  sourceMap: true,
+  sass: { outputStyle: 'compressed' },
+  autoprefixer: false
+});

types/sass-webpack-plugin/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "lib": ["es6", "dom"],
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "strictFunctionTypes": true,
+    "strictNullChecks": true,
+    "baseUrl": "../",
+    "jsx": "react",
+    "typeRoots": ["../"],
+    "types": [],
+    "noEmit": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "files": ["index.d.ts", "sass-webpack-plugin-tests.ts"]
+}

types/sass-webpack-plugin/tslint.json

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