Add types/tests for webpack-virtual-modules (#37025)

* Add types/tests for webpack-virtual-modules

* Set minimun typescript to match webpack's

types/webpack-virtual-modules/index.d.ts

@@ -0,0 +1,28 @@
+// Type definitions for webpack-virtual-modules 0.1
+// Project: https://github.com/sysgears/webpack-virtual-modules
+// Definitions by: Avi Vahl <https://github.com/AviVahl>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+import webpack = require('webpack');
+
+/**
+ * Plugin that allows dynamic generation of in-memory virtual modules for JavaScript builds
+ * created with webpack.
+ */
+declare class VirtualModulesPlugin {
+    constructor(modules?: Record<string, string>);
+
+    /**
+     * Attaches necessary hooks, in particular, `afterEnvironment`, `afterResolvers`, and `watchRun` hooks,
+     * to ensure that the virtual files are added dynamically.
+     */
+    apply(compiler: webpack.Compiler): void;
+
+    /**
+     * Writes a static or dynamic virtual module to a path.
+     */
+    writeModule(filePath: string, fileContents: string): void;
+}
+
+export = VirtualModulesPlugin;

types/webpack-virtual-modules/tsconfig.json

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

types/webpack-virtual-modules/tslint.json

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

types/webpack-virtual-modules/webpack-virtual-modules-tests.ts

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+import webpack = require('webpack');
+import VirtualModulesPlugin = require('webpack-virtual-modules');
+
+const virtualModules = new VirtualModulesPlugin({
+    'node_modules/module-foo.js': 'module.exports = { foo: "foo" };',
+    'node_modules/module-bar.js': 'module.exports = { bar: "bar" };',
+});
+
+virtualModules.writeModule('node_modules/module-foo.js', 'module.exports = { foo: "foo" };');
+
+webpack({
+    plugins: [virtualModules],
+});