Updated the files.

my-app/node_modules/webpack/bin/webpack.js

@@ -0,0 +1,187 @@
+#!/usr/bin/env node
+
+/**
+ * @param {string} command process to run
+ * @param {string[]} args command line arguments
+ * @returns {Promise<void>} promise
+ */
+const runCommand = (command, args) => {
+	const cp = require("child_process");
+	return new Promise((resolve, reject) => {
+		const executedCommand = cp.spawn(command, args, {
+			stdio: "inherit",
+			shell: true
+		});
+
+		executedCommand.on("error", error => {
+			reject(error);
+		});
+
+		executedCommand.on("exit", code => {
+			if (code === 0) {
+				resolve();
+			} else {
+				reject();
+			}
+		});
+	});
+};
+
+/**
+ * @param {string} packageName name of the package
+ * @returns {boolean} is the package installed?
+ */
+const isInstalled = packageName => {
+	if (process.versions.pnp) {
+		return true;
+	}
+
+	const path = require("path");
+	const fs = require("graceful-fs");
+
+	let dir = __dirname;
+
+	do {
+		try {
+			if (
+				fs.statSync(path.join(dir, "node_modules", packageName)).isDirectory()
+			) {
+				return true;
+			}
+		} catch (_error) {
+			// Nothing
+		}
+	} while (dir !== (dir = path.dirname(dir)));
+
+	// https://github.com/nodejs/node/blob/v18.9.1/lib/internal/modules/cjs/loader.js#L1274
+	// eslint-disable-next-line no-warning-comments
+	// @ts-ignore
+	for (const internalPath of require("module").globalPaths) {
+		try {
+			if (fs.statSync(path.join(internalPath, packageName)).isDirectory()) {
+				return true;
+			}
+		} catch (_error) {
+			// Nothing
+		}
+	}
+
+	return false;
+};
+
+/**
+ * @param {CliOption} cli options
+ * @returns {void}
+ */
+const runCli = cli => {
+	const path = require("path");
+	const pkgPath = require.resolve(`${cli.package}/package.json`);
+	// eslint-disable-next-line node/no-missing-require
+	const pkg = require(pkgPath);
+
+	if (pkg.type === "module" || /\.mjs/i.test(pkg.bin[cli.binName])) {
+		// eslint-disable-next-line node/no-unsupported-features/es-syntax
+		import(path.resolve(path.dirname(pkgPath), pkg.bin[cli.binName])).catch(
+			error => {
+				console.error(error);
+				process.exitCode = 1;
+			}
+		);
+	} else {
+		// eslint-disable-next-line node/no-missing-require
+		require(path.resolve(path.dirname(pkgPath), pkg.bin[cli.binName]));
+	}
+};
+
+/**
+ * @typedef {Object} CliOption
+ * @property {string} name display name
+ * @property {string} package npm package name
+ * @property {string} binName name of the executable file
+ * @property {boolean} installed currently installed?
+ * @property {string} url homepage
+ */
+
+/** @type {CliOption} */
+const cli = {
+	name: "webpack-cli",
+	package: "webpack-cli",
+	binName: "webpack-cli",
+	installed: isInstalled("webpack-cli"),
+	url: "https://github.com/webpack/webpack-cli"
+};
+
+if (!cli.installed) {
+	const path = require("path");
+	const fs = require("graceful-fs");
+	const readLine = require("readline");
+
+	const notify =
+		"CLI for webpack must be installed.\n" + `  ${cli.name} (${cli.url})\n`;
+
+	console.error(notify);
+
+	let packageManager;
+
+	if (fs.existsSync(path.resolve(process.cwd(), "yarn.lock"))) {
+		packageManager = "yarn";
+	} else if (fs.existsSync(path.resolve(process.cwd(), "pnpm-lock.yaml"))) {
+		packageManager = "pnpm";
+	} else {
+		packageManager = "npm";
+	}
+
+	const installOptions = [packageManager === "yarn" ? "add" : "install", "-D"];
+
+	console.error(
+		`We will use "${packageManager}" to install the CLI via "${packageManager} ${installOptions.join(
+			" "
+		)} ${cli.package}".`
+	);
+
+	const question = `Do you want to install 'webpack-cli' (yes/no): `;
+
+	const questionInterface = readLine.createInterface({
+		input: process.stdin,
+		output: process.stderr
+	});
+
+	// In certain scenarios (e.g. when STDIN is not in terminal mode), the callback function will not be
+	// executed. Setting the exit code here to ensure the script exits correctly in those cases. The callback
+	// function is responsible for clearing the exit code if the user wishes to install webpack-cli.
+	process.exitCode = 1;
+	questionInterface.question(question, answer => {
+		questionInterface.close();
+
+		const normalizedAnswer = answer.toLowerCase().startsWith("y");
+
+		if (!normalizedAnswer) {
+			console.error(
+				"You need to install 'webpack-cli' to use webpack via CLI.\n" +
+					"You can also install the CLI manually."
+			);
+
+			return;
+		}
+		process.exitCode = 0;
+
+		console.log(
+			`Installing '${
+				cli.package
+			}' (running '${packageManager} ${installOptions.join(" ")} ${
+				cli.package
+			}')...`
+		);
+
+		runCommand(packageManager, installOptions.concat(cli.package))
+			.then(() => {
+				runCli(cli);
+			})
+			.catch(error => {
+				console.error(error);
+				process.exitCode = 1;
+			});
+	});
+} else {
+	runCli(cli);
+}