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next-dev.ts
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next-dev.ts
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#!/usr/bin/env node
import arg from 'next/dist/compiled/arg/index.js'
import { existsSync, watchFile } from 'fs'
import { startServer } from '../server/lib/start-server'
import { printAndExit } from '../server/lib/utils'
import * as Log from '../build/output/log'
import { startedDevelopmentServer } from '../build/output'
import { cliCommand } from '../lib/commands'
import isError from '../lib/is-error'
import { getProjectDir } from '../lib/get-project-dir'
import { CONFIG_FILES } from '../shared/lib/constants'
import path from 'path'
const nextDev: cliCommand = (argv) => {
const validArgs: arg.Spec = {
// Types
'--help': Boolean,
'--port': Number,
'--hostname': String,
// Aliases
'-h': '--help',
'-p': '--port',
'-H': '--hostname',
}
let args: arg.Result<arg.Spec>
try {
args = arg(validArgs, { argv })
} catch (error) {
if (isError(error) && error.code === 'ARG_UNKNOWN_OPTION') {
return printAndExit(error.message, 1)
}
throw error
}
if (args['--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 the directory of the Next.js application.
If no directory is provided, the current directory will be used.
Options
--port, -p A port number on which to start the application
--hostname, -H Hostname on which to start the application (default: 0.0.0.0)
--help, -h Displays this message
`)
process.exit(0)
}
const dir = getProjectDir(args._[0])
// Check if pages dir exists and warn if not
if (!existsSync(dir)) {
printAndExit(`> No such directory exists as the project root: ${dir}`)
}
async function preflight() {
const { getPackageVersion } = await Promise.resolve(
require('../lib/get-package-version')
)
const [sassVersion, nodeSassVersion] = await Promise.all([
getPackageVersion({ cwd: dir, name: 'sass' }),
getPackageVersion({ cwd: dir, name: 'node-sass' }),
])
if (sassVersion && nodeSassVersion) {
Log.warn(
'Your project has both `sass` and `node-sass` installed as dependencies, but should only use one or the other. ' +
'Please remove the `node-sass` dependency from your project. ' +
' Read more: https://nextjs.org/docs/messages/duplicate-sass'
)
}
}
const allowRetry = !args['--port']
let port: number =
args['--port'] || (process.env.PORT && parseInt(process.env.PORT)) || 3000
// we allow the server to use a random port while testing
// instead of attempting to find a random port and then hope
// it doesn't become occupied before we leverage it
if (process.env.__NEXT_FORCED_PORT) {
port = parseInt(process.env.__NEXT_FORCED_PORT, 10) || 0
}
// We do not set a default host value here to prevent breaking
// some set-ups that rely on listening on other interfaces
const host = args['--hostname']
startServer({
allowRetry,
dev: true,
dir,
hostname: host,
isNextDevCommand: true,
port,
})
.then(async (app) => {
const appUrl = `http://${app.hostname}:${app.port}`
startedDevelopmentServer(appUrl, `${host || '0.0.0.0'}:${app.port}`)
// Start preflight after server is listening and ignore errors:
preflight().catch(() => {})
// Finalize server bootup:
await app.prepare()
})
.catch((err) => {
if (err.code === 'EADDRINUSE') {
let errorMessage = `Port ${port} is already in use.`
const pkgAppPath = require('next/dist/compiled/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))
})
for (const CONFIG_FILE of CONFIG_FILES) {
watchFile(path.join(dir, CONFIG_FILE), (cur: any, prev: any) => {
if (cur.size > 0 || prev.size > 0) {
console.log(
`\n> Found a change in ${CONFIG_FILE}. Restart the server to see the changes in effect.`
)
}
})
}
}
export { nextDev }