add worker-plugin types (#41223)

types/worker-plugin/index.d.ts

@@ -0,0 +1,20 @@
+// Type definitions for worker-plugin 3.2
+// Project: https://github.com/GoogleChromeLabs/worker-plugin
+// Definitions by: Artur Androsovych <https://github.com/arturovt>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import * as webpack from 'webpack';
+
+export = WorkerPlugin;
+
+declare class WorkerPlugin extends webpack.Plugin {
+  constructor(options?: WorkerPlugin.Options);
+}
+
+declare namespace WorkerPlugin {
+  interface Options {
+    globalObject?: boolean | string;
+    plugins?: Array<string | webpack.Plugin>;
+  }
+}

types/worker-plugin/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",
+      "worker-plugin-tests.ts"
+  ]
+}

types/worker-plugin/tslint.json

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

types/worker-plugin/worker-plugin-tests.ts

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+import WorkerPlugin = require('worker-plugin');
+import webpack = require('webpack');
+
+new WorkerPlugin();
+
+class ExistingPlugin extends webpack.Plugin {}
+
+const optionsArray: WorkerPlugin.Options[] = [
+    {
+        globalObject: false,
+    },
+    {
+        globalObject: 'self',
+    },
+    {
+        plugins: [
+          'SomeExistingPlugin',
+          new ExistingPlugin(),
+        ],
+    }
+];
+
+const plugins = optionsArray.map(options => new WorkerPlugin(options));