fix(init): support global installation

bin/prompt-command.js

@@ -27,6 +27,16 @@ const runCommand = (command, args) => {
 	});
 };
 
+const npmGlobalRoot = () => {
+	const cp = require("child_process");
+	return new Promise((resolve, reject) => {
+		const command = cp.spawn("npm", ["root", "-g"]);
+		command.on('error', (error) => reject(error));
+		command.stdout.on('data', (data) => resolve(data.toString()));
+		command.stderr.on('data', (data) => reject(data));
+	})
+}
+
 module.exports = function promptForInstallation(packages, ...args) {
 	const nameOfPackage = "@webpack-cli/" + packages;
 	let packageIsInstalled = false;
@@ -59,9 +69,18 @@ module.exports = function promptForInstallation(packages, ...args) {
 			options[0] = "add";
 		}
 
+		if (packages == 'init') {
+			if (isYarn) {
+				options.splice(1, 1); // remove '-D'
+				options.splice(0, 0, "global");
+			} else {
+				options[1] = "-g";
+			}
+		}
+
 		const commandToBeRun = `${packageManager} ${options.join(" ")}`;
 
-		const question = `Would you like to install ${packages}? (That will run ${commandToBeRun}) (yes/NO)`;
+		const question = `Would you like to install ${packages}? (That will run ${commandToBeRun}) (yes/NO) : `;
 
 		console.error(`The command moved into a separate package: ${nameOfPackage}`);
 		const questionInterface = readLine.createInterface({
@@ -77,6 +96,22 @@ module.exports = function promptForInstallation(packages, ...args) {
 
 					runCommand(packageManager, options)
 						.then(_=> {
+							if (packages == "init") {
+								npmGlobalRoot()
+									.then((root) => {
+										pathtoInit = path.resolve(root.trim(), "@webpack-cli", "init");
+										return pathtoInit;
+									})
+									.then((pathForInit) => {
+										return require(pathForInit).default(...args);
+									})
+									.catch((error) => {
+										console.error(error);
+										process.exitCode = 1;
+									})
+								return;
+							}
+
 							pathForCmd = path.resolve(process.cwd(), "node_modules", "@webpack-cli", packages);
 							if (packages === "serve") {
 								return require(pathForCmd).default.serve();