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rOACCT/node_modules/webpack-dev-server/bin/webpack-dev-server.js
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webpack-dev-server.js
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			#!/usr/bin/env node
			/* Based on webpack/bin/webpack.js */
			/* eslint-disable no-console */

			"use strict";

			/**
			* @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
			}
			// eslint-disable-next-line no-cond-assign
			} while (dir !== (dir = path.dirname(dir)));

			return false;
			};

			/**
			* @param {CliOption} cli options
			* @returns {void}
			*/
			const runCli = (cli) => {
			if (cli.preprocess) {
			cli.preprocess();
			}
			const path = require("path");
			const pkgPath = require.resolve(`${cli.package}/package.json`);
			// eslint-disable-next-line import/no-dynamic-require
			const pkg = require(pkgPath);
			// eslint-disable-next-line import/no-dynamic-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
			* @property {function} preprocess preprocessor
			*/

			/** @type {CliOption} */
			const cli = {
			name: "webpack-cli",
			package: "webpack-cli",
			binName: "webpack-cli",
			installed: isInstalled("webpack-cli"),
			url: "https://github.com/webpack/webpack-cli",
			preprocess() {
			process.argv.splice(2, 0, "serve");
			},
			};

			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);

			/**
			* @type {string}
			*/
			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);
			}