137 lines
4 KiB
JavaScript
Executable file
137 lines
4 KiB
JavaScript
Executable file
#!/usr/bin/env node
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import { resolve } from 'path'
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import arg from 'next/dist/compiled/arg/index.js'
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import { existsSync } from 'fs'
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import startServer from '../server/lib/start-server'
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import { printAndExit } from '../server/lib/utils'
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import * as Log from '../build/output/log'
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import { startedDevelopmentServer } from '../build/output'
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import { cliCommand } from '../bin/next'
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const nextDev: cliCommand = (argv) => {
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const validArgs: arg.Spec = {
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// Types
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'--help': Boolean,
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'--port': Number,
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'--hostname': String,
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// Aliases
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'-h': '--help',
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'-p': '--port',
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'-H': '--hostname',
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}
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let args: arg.Result<arg.Spec>
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try {
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args = arg(validArgs, { argv })
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} catch (error) {
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if (error.code === 'ARG_UNKNOWN_OPTION') {
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return printAndExit(error.message, 1)
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}
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throw error
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}
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if (args['--help']) {
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console.log(`
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Description
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Starts the application in development mode (hot-code reloading, error
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reporting, etc)
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Usage
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$ next dev <dir> -p <port number>
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<dir> represents the directory of the Next.js application.
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If no directory is provided, the current directory will be used.
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Options
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--port, -p A port number on which to start the application
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--hostname, -H Hostname on which to start the application
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--help, -h Displays this message
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`)
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process.exit(0)
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}
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const dir = resolve(args._[0] || '.')
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// Check if pages dir exists and warn if not
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if (!existsSync(dir)) {
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printAndExit(`> No such directory exists as the project root: ${dir}`)
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}
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async function preflight() {
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const { getPackageVersion } = await import('../lib/get-package-version')
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const semver = await import('next/dist/compiled/semver').then(
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(res) => res.default
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)
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const reactVersion: string | null = await getPackageVersion({
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cwd: dir,
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name: 'react',
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})
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if (
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reactVersion &&
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semver.lt(reactVersion, '16.10.0') &&
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semver.coerce(reactVersion)?.version !== '0.0.0'
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) {
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Log.warn(
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'Fast Refresh is disabled in your application due to an outdated `react` version. Please upgrade 16.10 or newer!' +
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' Read more: https://err.sh/next.js/react-version'
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)
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} else {
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const reactDomVersion: string | null = await getPackageVersion({
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cwd: dir,
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name: 'react-dom',
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})
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if (
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reactDomVersion &&
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semver.lt(reactDomVersion, '16.10.0') &&
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semver.coerce(reactDomVersion)?.version !== '0.0.0'
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) {
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Log.warn(
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'Fast Refresh is disabled in your application due to an outdated `react-dom` version. Please upgrade 16.10 or newer!' +
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' Read more: https://err.sh/next.js/react-version'
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)
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}
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}
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}
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const port = args['--port'] || 3000
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const appUrl = `http://${args['--hostname'] || 'localhost'}:${port}`
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startServer(
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{ dir, dev: true, isNextDevCommand: true },
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port,
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args['--hostname']
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)
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.then(async (app) => {
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startedDevelopmentServer(appUrl)
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// Start preflight after server is listening and ignore errors:
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preflight().catch(() => {})
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// Finalize server bootup:
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await app.prepare()
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})
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.catch((err) => {
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if (err.code === 'EADDRINUSE') {
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let errorMessage = `Port ${port} is already in use.`
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const pkgAppPath = require('next/dist/compiled/find-up').sync(
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'package.json',
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{
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cwd: dir,
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}
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)
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const appPackage = require(pkgAppPath)
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if (appPackage.scripts) {
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const nextScript = Object.entries(appPackage.scripts).find(
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(scriptLine) => scriptLine[1] === 'next'
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)
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if (nextScript) {
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errorMessage += `\nUse \`npm run ${nextScript[0]} -- -p <some other port>\`.`
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}
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}
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console.error(errorMessage)
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} else {
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console.error(err)
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}
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process.nextTick(() => process.exit(1))
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})
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}
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export { nextDev }
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