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next.js/bin/next

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#!/usr/bin/env node
import { join, resolve } from 'path'
import { spawn } from 'cross-spawn'
import { watchFile } from 'fs'
import pkg from '../../package.json'
import getConfig from '../server/config'
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if (pkg.peerDependencies) {
Object.keys(pkg.peerDependencies).forEach(dependency => {
try {
// When 'npm link' is used it checks the clone location. Not the project.
require.resolve(dependency)
} catch (err) {
console.warn(`${dependency} not found. Please install ${dependency} using 'npm install ${dependency}'`)
}
})
}
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const defaultCommand = 'dev'
const commands = new Set([
'init',
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'build',
'start',
defaultCommand
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])
let cmd = process.argv[2]
let args
if (new Set(['--version', '-v']).has(cmd)) {
console.log(`next.js v${pkg.version}`)
process.exit(0)
}
if (new Set(['--help', '-h']).has(cmd)) {
console.log(`
Usage
$ next <command>
Available commands
${Array.from(commands).join(', ')}
For more information run a command with the --help flag
$ next init --help
`)
process.exit(0)
}
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if (commands.has(cmd)) {
args = process.argv.slice(3)
} else {
cmd = defaultCommand
args = process.argv.slice(2)
}
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const bin = join(__dirname, 'next-' + cmd)
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const startProcess = () => {
const proc = spawn(bin, args, { stdio: 'inherit', customFds: [0, 1, 2] })
proc.on('close', (code, signal) => {
if (code !== null) {
process.exit(code)
}
if (signal) {
if (signal === 'SIGKILL') {
process.exit(137)
}
console.log(`got signal ${signal}, exiting`)
process.exit(1)
}
process.exit(0)
})
proc.on('error', (err) => {
console.error(err)
process.exit(1)
})
return proc
}
let proc = startProcess()
const { pagesDirectory = resolve(process.cwd(), 'pages') } = getConfig(process.cwd())
if (cmd === 'dev') {
watchFile(`${resolve(pagesDirectory, '..')}/next.config.js`, (cur, prev) => {
if (cur.size > 0 || prev.size > 0) {
console.log('\n> Found a change in next.config.js, restarting the server...')
// Don't listen to 'close' now since otherwise parent gets killed by listener
proc.removeAllListeners('close')
proc.kill()
proc = startProcess()
}
})
}