[webpack-dotenv-plugin] Add type definitions (#18726)

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

@@ -0,0 +1,22 @@
+// Type definitions for webpack-dotenv-plugin 2.0
+// Project: https://github.com/nwinch/webpack-dotenv-plugin#readme
+// Definitions by: Michael Strobel <https://github.com/kryops>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import * as webpack from 'webpack';
+
+declare namespace WebpackDotenvPlugin {
+    interface Options {
+        path?: string;
+        sample?: string;
+        silent?: boolean;
+        encoding?: string;
+        allowEmptyValues?: boolean;
+    }
+}
+
+declare class WebpackDotenvPlugin extends webpack.Plugin {
+    constructor(options?: WebpackDotenvPlugin.Options);
+}
+
+export = WebpackDotenvPlugin;

types/webpack-dotenv-plugin/tsconfig.json

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

types/webpack-dotenv-plugin/tslint.json

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

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

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+import * as webpack from 'webpack';
+import * as DotenvPlugin from 'webpack-dotenv-plugin';
+
+const config: webpack.Configuration = {
+    plugins: [
+        new DotenvPlugin(),
+        new DotenvPlugin({
+            sample: './.env.default',
+            path: './.env'
+        }),
+        new DotenvPlugin({
+            sample: './.env.default',
+            path: './.env',
+            silent: true,
+            encoding: 'utf-8',
+            allowEmptyValues: true
+        })
+    ]
+};