[@wordpress/dependency-extraction-webpack-plugin] add new definitions (#36033)

* [@wordpress/dependency-extraction-webpack-plugin] add new definitions

* use more appropriate "export =" syntax

types/wordpress__dependency-extraction-webpack-plugin/index.d.ts

@@ -0,0 +1,20 @@
+// Type definitions for @wordpress/dependency-extraction-webpack-plugin 1.0
+// Project: https://github.com/WordPress/gutenberg/tree/master/packages/dependency-extraction-webpack-plugin/README.md
+// Definitions by: Derek Sifford <https://github.com/dsifford>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.5
+
+import { Plugin } from "webpack";
+
+interface Options {
+    useDefaults?: boolean;
+    injectPolyfill?: boolean;
+    requestToExternal?(request: string): string | string[] | void;
+    requestToHandle?(request: string): string | void;
+}
+
+declare class DependencyExtractionWebpackPlugin extends Plugin {
+    constructor(options?: Options);
+}
+
+export = DependencyExtractionWebpackPlugin;

types/wordpress__dependency-extraction-webpack-plugin/tsconfig.json

@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "paths": {
+            "@wordpress/dependency-extraction-webpack-plugin": [
+                "wordpress__dependency-extraction-webpack-plugin"
+            ]
+        }
+    },
+    "files": [
+        "index.d.ts",
+        "wordpress__dependency-extraction-webpack-plugin-tests.ts"
+    ]
+}

types/wordpress__dependency-extraction-webpack-plugin/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }

types/wordpress__dependency-extraction-webpack-plugin/wordpress__dependency-extraction-webpack-plugin-tests.ts

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+import DependencyExtractionPlugin = require('@wordpress/dependency-extraction-webpack-plugin');
+
+new DependencyExtractionPlugin();
+
+new DependencyExtractionPlugin({
+    useDefaults: false,
+});
+
+new DependencyExtractionPlugin({
+    requestToExternal(request) {
+        if (request === "foo-bar") {
+            return "FooBar";
+        }
+        if (request === "baz-qux") {
+            return ["baz", "qux"];
+        }
+    },
+    requestToHandle: request => {
+        if (request === "foo-bar") {
+            return "FooBar";
+        }
+    }
+});