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next.js/bin/next

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#!/usr/bin/env node
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import { join } from 'path'
import { spawn } from 'cross-spawn'
import { watchFile } from 'fs'
import pkg from '../../package.json'
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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) => process.exit(code))
proc.on('error', (err) => {
console.error(err)
process.exit(1)
})
return proc
}
let proc = startProcess()
if (cmd === 'dev') {
watchFile(join(process.cwd(), '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()
}
})
}