#!/usr/bin/env node import 'source-map-support/register' import { resolve, join } from 'path' import parseArgs from 'minimist' import { existsSync, readFileSync } from 'fs' import Server from '../server' import { printAndExit } from '../lib/utils' import pkgUp from 'pkg-up' process.env.NODE_ENV = process.env.NODE_ENV || 'development' const argv = parseArgs(process.argv.slice(2), { alias: { h: 'help', p: 'port' }, boolean: ['h'], default: { p: 3000 } }) if (argv.help) { console.log(` Description Starts the application in development mode (hot-code reloading, error reporting, etc) Usage $ next dev -p represents where the compiled .next folder should go. If no directory is provided, .next will be created in the current directory Options --port, -p A port number on which to start the application --help, -h Displays this message `) process.exit(0) } const dir = resolve(argv._[0] || '.') // Check if pages dir exists and warn if not if (!existsSync(dir)) { printAndExit(`> No such directory exists as the project root: ${dir}`) } if (!existsSync(join(dir, 'pages'))) { if (existsSync(join(dir, '..', 'pages'))) { printAndExit('> No `pages` directory found. Did you mean to run `next` in the parent (`../`) directory?') } printAndExit('> Couldn\'t find a `pages` directory. Please create one under the project root') } const srv = new Server({ dir, dev: true }) srv.start(argv.port) .then(async () => { if (!process.env.NOW) { console.log(`> Ready on http://localhost:${argv.port}`) } }) .catch((err) => { if (err.code === 'EADDRINUSE') { let errorMessage = `Port ${argv.port} is already in use.` const pkgAppPath = pkgUp.sync('.') const appPackage = JSON.parse(readFileSync(pkgAppPath, 'utf8')) const nextScript = Object.entries(appPackage.scripts).find(scriptLine => scriptLine[1] === 'next') if (nextScript) errorMessage += `\nUse \`npm run ${nextScript[0]} -- -p \`.` console.error(errorMessage) } else { console.error(err) } process.nextTick(() => process.exit(1)) })