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node\nimport { resolve } from 'path'\nimport arg from 'next/dist/compiled/arg/index.js'\nimport { existsSync } from 'fs'\nimport startServer from '../server/lib/start-server'\nimport { printAndExit } from '../server/lib/utils'\nimport * as Log from '../build/output/log'\nimport { startedDevelopmentServer } from '../build/output'\nimport { cliCommand } from '../bin/next'\n\nconst nextDev: cliCommand = (argv) => {\n const validArgs: arg.Spec = {\n // Types\n '--help': Boolean,\n '--port': Number,\n '--hostname': String,\n\n // Aliases\n '-h': '--help',\n '-p': '--port',\n '-H': '--hostname',\n }\n let args: arg.Result<arg.Spec>\n try {\n args = arg(validArgs, { argv })\n } catch (error) {\n if (error.code === 'ARG_UNKNOWN_OPTION') {\n return printAndExit(error.message, 1)\n }\n throw error\n }\n if (args['--help']) {\n console.log(`\n Description\n Starts the application in development mode (hot-code reloading, error\n reporting, etc)\n\n Usage\n $ next dev <dir> -p <port number>\n\n <dir> represents the directory of the Next.js application.\n If no directory is provided, the current directory will be used.\n\n Options\n --port, -p A port number on which to start the application\n --hostname, -H Hostname on which to start the application (default: 0.0.0.0)\n --help, -h Displays this message\n `)\n process.exit(0)\n }\n\n const dir = resolve(args._[0] || '.')\n\n // Check if pages dir exists and warn if not\n if (!existsSync(dir)) {\n printAndExit(`> No such directory exists as the project root: ${dir}`)\n }\n\n async function preflight() {\n const { getPackageVersion } = await import('../lib/get-package-version')\n const [sassVersion, nodeSassVersion] = await Promise.all([\n getPackageVersion({ cwd: dir, name: 'sass' }),\n getPackageVersion({ cwd: dir, name: 'node-sass' }),\n ])\n if (sassVersion && nodeSassVersion) {\n Log.warn(\n 'Your project has both `sass` and `node-sass` installed as dependencies, but should only use one or the other. ' +\n 'Please remove the `node-sass` dependency from your project. ' +\n ' Read more: https://nextjs.org/docs/messages/duplicate-sass'\n )\n }\n }\n\n const port =\n args['--port'] || (process.env.PORT && parseInt(process.env.PORT)) || 3000\n const host = args['--hostname'] || '0.0.0.0'\n const appUrl = `http://${host === '0.0.0.0' ? 'localhost' : host}:${port}`\n\n startServer({ dir, dev: true, isNextDevCommand: true }, port, host)\n .then(async (app) => {\n startedDevelopmentServer(appUrl, `${host}:${port}`)\n // Start preflight after server is listening and ignore errors:\n preflight().catch(() => {})\n // Finalize server bootup:\n await app.prepare()\n })\n .catch((err) => {\n if (err.code === 'EADDRINUSE') {\n let errorMessage = `Port ${port} is already in use.`\n const pkgAppPath = require('next/dist/compiled/find-up').sync(\n 'package.json',\n {\n cwd: dir,\n }\n )\n const appPackage = require(pkgAppPath)\n if (appPackage.scripts) {\n const nextScript = Object.entries(appPackage.scripts).find(\n (scriptLine) => scriptLine[1] === 'next'\n )\n if (nextScript) {\n errorMessage += `\\nUse \\`npm run ${nextScript[0]} -- -p <some other port>\\`.`\n }\n }\n console.error(errorMessage)\n } else {\n console.error(err)\n }\n process.nextTick(() => process.exit(1))\n })\n}\n\nexport { nextDev }\n"]} |