Add types for start-server-webpack-plugin (#43689)

* Added declarations for start-server-webpack-plugin

* Applied standard linting

* Update start-server-webpack-plugin - accept string litterals for 'signal' option

Co-Authored-By: Piotr Błażejewicz (Peter Blazejewicz) <peterblazejewicz@users.noreply.github.com>

* Update start-server-webpack-plugin - create parameterless constructor suppport

Co-Authored-By: Piotr Błażejewicz (Peter Blazejewicz) <peterblazejewicz@users.noreply.github.com>

* Update start-server-webpack-plugin - remove redundant typing of 'apply' method

Co-Authored-By: Piotr Błażejewicz (Peter Blazejewicz) <peterblazejewicz@users.noreply.github.com>

* Update start-server-webpack-plugin - remove typescript version as not needed

Co-Authored-By: Piotr Błażejewicz (Peter Blazejewicz) <peterblazejewicz@users.noreply.github.com>

* Update start-server-webpack-plugin - combined constructors

Co-authored-by: Piotr Błażejewicz (Peter Blazejewicz) <peterblazejewicz@users.noreply.github.com>

types/start-server-webpack-plugin/index.d.ts

@@ -0,0 +1,42 @@
+// Type definitions for start-server-webpack-plugin 2.2
+// Project: https://github.com/ericclemmons/start-server-webpack-plugin
+// Definitions by: AGenson <https://github.com/AGenson>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import { Plugin, Compiler } from 'webpack';
+
+export = StartServerWebpackPlugin;
+
+declare class StartServerWebpackPlugin extends Plugin {
+    constructor(options?: string | StartServerWebpackPlugin.Options);
+}
+
+declare namespace StartServerWebpackPlugin {
+    interface Options {
+        /**
+         * Name of the server to start (built asset from webpack).
+         * If not provided, the plugin will tell you the available names.
+         */
+        name?: string;
+        /**
+         * Arguments for node.
+         * Default: `[]`.
+         */
+        nodeArgs?: string[];
+        /**
+         * Arguments for the script.
+         * Default: `[]`.
+         */
+        args?: string[];
+        /**
+         * Signal to send for HMR.
+         * Default: 'false'.
+         */
+        signal?: false | true | 'SIGUSR2';
+        /**
+         * Allow typing 'rs' to restart the server.
+         * Default: 'true' if in 'development' mode, 'false' otherwise.
+         */
+        keyboard?: boolean;
+    }
+}

types/start-server-webpack-plugin/start-server-webpack-plugin-tests.ts

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+import { Configuration } from 'webpack';
+import StartServerWebpackPlugin = require('start-server-webpack-plugin');
+
+const c1: Configuration = {
+    plugins: [
+        new StartServerWebpackPlugin('main.js')
+    ]
+};
+
+const c2: Configuration = {
+    plugins: [
+        new StartServerWebpackPlugin({
+            name: 'main.js',
+            nodeArgs: [],
+            args: [],
+            signal: false,
+            keyboard: false
+        })
+    ]
+};

types/start-server-webpack-plugin/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",
+        "start-server-webpack-plugin-tests.ts"
+    ]
+}

types/start-server-webpack-plugin/tslint.json

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