Create definitions for dotenv-webpack (#24828)

types/dotenv-webpack/dotenv-webpack-tests.ts

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+import * as webpack from 'webpack';
+import DotenvWebpackPlugin = require('dotenv-webpack');
+
+new DotenvWebpackPlugin(); // $ExpectType DotenvWebpackPlugin
+
+const options: DotenvWebpackPlugin.Options = {
+    path: './some.other.env',
+    safe: true,
+    systemvars: true,
+    silent: true
+};
+
+const config: webpack.Configuration = {
+    plugins: [
+        new DotenvWebpackPlugin(),
+        new DotenvWebpackPlugin({
+            path: './some.other.env',
+        }),
+        new DotenvWebpackPlugin(options),
+    ]
+};

types/dotenv-webpack/index.d.ts

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+// Type definitions for dotenv-webpack 1.5
+// Project: https://github.com/mrsteele/dotenv-webpack
+// Definitions by: Karol Majewski <https://github.com/karol-majewski>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.7
+
+import * as webpack from 'webpack';
+
+declare class DotenvWebpackPlugin extends webpack.Plugin {
+  constructor(options?: DotenvWebpackPlugin.Options);
+}
+
+declare namespace DotenvWebpackPlugin {
+  interface Options {
+    /**
+     * The path to your environment variables. Default: `'./.env'`.
+     */
+    path?: string;
+
+    /**
+     * If `false` ignore safe-mode, if `true` load `'./.env.example'`, if a `string` load that file as the sample. Default: `false`.
+     */
+    safe?: boolean;
+
+    /**
+     * Set to `true` if you would rather load all system variables as well (useful for CI purposes). Default: `false`.
+     */
+    systemvars?: boolean;
+
+    /**
+     * If `true`, all warnings will be surpressed. Default: `false`.
+     */
+    silent?: boolean;
+  }
+}
+
+export = DotenvWebpackPlugin;

types/dotenv-webpack/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",
+        "dotenv-webpack-tests.ts"
+    ]
+}

types/dotenv-webpack/tslint.json

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