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next.js/packages/next/bin/next-dev

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#!/usr/bin/env node
import { resolve, join } from 'path'
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import parseArgs from 'minimist'
import { existsSync } from 'fs'
import startServer from '../server/lib/start-server'
import { printAndExit } from '../server/lib/utils'
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const argv = parseArgs(process.argv.slice(2), {
alias: {
h: 'help',
H: 'hostname',
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p: 'port'
},
boolean: ['h'],
string: ['H'],
default: { p: 3000 }
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})
if (argv.help) {
console.log(`
Description
Starts the application in development mode (hot-code reloading, error
reporting, etc)
Usage
$ next dev <dir> -p <port number>
<dir> represents where the compiled folder should go.
If no directory is provided, the folder will be created in the current directory.
You can set a custom folder in config https://github.com/zeit/next.js#custom-configuration.
Options
--port, -p A port number on which to start the application
--hostname, -H Hostname on which to start the application
--help, -h Displays this message
`)
process.exit(0)
}
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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: ${dir}`)
}
if (!existsSync(join(dir, 'pages'))) {
if (existsSync(join(dir, '..', 'pages'))) {
printAndExit('> No `pages` directory found. Did you mean to run `next` in the parent (`../`) directory?')
}
printAndExit('> Couldn\'t find a `pages` directory. Please create one under the project root')
}
startServer({dir, dev: true}, argv.port, argv.hostname)
.then(async () => {
console.log(`> Ready on http://${argv.hostname ? argv.hostname : 'localhost'}:${argv.port}`)
})
.catch((err) => {
if (err.code === 'EADDRINUSE') {
let errorMessage = `Port ${argv.port} is already in use.`
const pkgAppPath = require('find-up').sync('package.json', {
cwd: dir
})
const appPackage = require(pkgAppPath)
if (appPackage.scripts) {
const nextScript = Object.entries(appPackage.scripts).find(scriptLine => scriptLine[1] === 'next')
if (nextScript) {
errorMessage += `\nUse \`npm run ${nextScript[0]} -- -p <some other port>\`.`
}
}
console.error(errorMessage)
} else {
console.error(err)
}
process.nextTick(() => process.exit(1))
})