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next.ts
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next.ts
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#!/usr/bin/env node
import * as log from '../build/output/log'
import arg from 'next/dist/compiled/arg/index.js'
import { NON_STANDARD_NODE_ENV } from '../lib/constants'
;['react', 'react-dom'].forEach((dependency) => {
try {
// When 'npm link' is used it checks the clone location. Not the project.
require.resolve(dependency)
} catch (err) {
console.warn(
`The module '${dependency}' was not found. Next.js requires that you include it in 'dependencies' of your 'package.json'. To add it, run 'npm install ${dependency}'`
)
}
})
const defaultCommand = 'dev'
export type cliCommand = (argv?: string[]) => void
export const commands: { [command: string]: () => Promise<cliCommand> } = {
build: () => Promise.resolve(require('../cli/next-build').nextBuild),
start: () => Promise.resolve(require('../cli/next-start').nextStart),
export: () => Promise.resolve(require('../cli/next-export').nextExport),
dev: () => Promise.resolve(require('../cli/next-dev').nextDev),
lint: () => Promise.resolve(require('../cli/next-lint').nextLint),
telemetry: () =>
Promise.resolve(require('../cli/next-telemetry').nextTelemetry),
info: () => Promise.resolve(require('../cli/next-info').nextInfo),
}
const args = arg(
{
// Types
'--version': Boolean,
'--help': Boolean,
'--inspect': Boolean,
// Aliases
'-v': '--version',
'-h': '--help',
},
{
permissive: true,
}
)
// Detect if react-dom is enabled streaming rendering mode
const shouldUseReactRoot = !!require('react-dom/server').renderToPipeableStream
// Version is inlined into the file using taskr build pipeline
if (args['--version']) {
console.log(`Next.js v${process.env.__NEXT_VERSION}`)
process.exit(0)
}
// Check if we are running `next <subcommand>` or `next`
const foundCommand = Boolean(commands[args._[0]])
// Makes sure the `next --help` case is covered
// This help message is only showed for `next --help`
// `next <subcommand> --help` falls through to be handled later
if (!foundCommand && args['--help']) {
console.log(`
Usage
$ next <command>
Available commands
${Object.keys(commands).join(', ')}
Options
--version, -v Version number
--help, -h Displays this message
For more information run a command with the --help flag
$ next build --help
`)
process.exit(0)
}
const command = foundCommand ? args._[0] : defaultCommand
const forwardedArgs = foundCommand ? args._.slice(1) : args._
if (args['--inspect'])
throw new Error(
`--inspect flag is deprecated. Use env variable NODE_OPTIONS instead: NODE_OPTIONS='--inspect' next ${command}`
)
// Make sure the `next <subcommand> --help` case is covered
if (args['--help']) {
forwardedArgs.push('--help')
}
const defaultEnv = command === 'dev' ? 'development' : 'production'
const standardEnv = ['production', 'development', 'test']
if (process.env.NODE_ENV) {
const isNotStandard = !standardEnv.includes(process.env.NODE_ENV)
const shouldWarnCommands =
process.env.NODE_ENV === 'development'
? ['start', 'build']
: process.env.NODE_ENV === 'production'
? ['dev']
: []
if (isNotStandard || shouldWarnCommands.includes(command)) {
log.warn(NON_STANDARD_NODE_ENV)
}
}
;(process.env as any).NODE_ENV = process.env.NODE_ENV || defaultEnv
;(process.env as any).NEXT_RUNTIME = 'nodejs'
if (shouldUseReactRoot) {
;(process.env as any).__NEXT_REACT_ROOT = 'true'
}
// x-ref: https://github.com/vercel/next.js/pull/34688#issuecomment-1047994505
if (process.versions.pnp === '3') {
const nodeVersionParts = process.versions.node
.split('.')
.map((v) => Number(v))
if (
nodeVersionParts[0] < 16 ||
(nodeVersionParts[0] === 16 && nodeVersionParts[1] < 14)
) {
log.warn(
'Node.js 16.14+ is required for Yarn PnP 3.20+. More info: https://github.com/vercel/next.js/pull/34688#issuecomment-1047994505'
)
}
}
// Make sure commands gracefully respect termination signals (e.g. from Docker)
process.on('SIGTERM', () => process.exit(0))
process.on('SIGINT', () => process.exit(0))
commands[command]()
.then((exec) => exec(forwardedArgs))
.then(() => {
if (command === 'build') {
// ensure process exits after build completes so open handles/connections
// don't cause process to hang
process.exit(0)
}
})
if (command === 'dev') {
const { CONFIG_FILES } = require('../shared/lib/constants')
const { watchFile } = require('fs')
for (const CONFIG_FILE of CONFIG_FILES) {
watchFile(`${process.cwd()}/${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.`
)
}
})
}
}