Nuxt/bin/nuxt-dev

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#!/usr/bin/env node
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/* eslint-disable no-console */
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const _ = require('lodash')
const debug = require('debug')('nuxt:build')
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debug.color = 2 // force green color
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const fs = require('fs')
const parseArgs = require('minimist')
const { Nuxt, Builder, Utils } = require('..')
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const chokidar = require('chokidar')
const path = require('path')
const resolve = path.resolve
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const pkg = require(path.join('..', 'package.json'))
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const argv = parseArgs(process.argv.slice(2), {
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alias: {
h: 'help',
H: 'hostname',
p: 'port',
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c: 'config-file',
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s: 'spa',
u: 'universal',
v: 'version'
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},
boolean: ['h', 's', 'u', 'v'],
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string: ['H', 'c'],
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default: {
c: 'nuxt.config.js'
}
})
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if (argv.version) {
console.log(pkg.version)
process.exit(0)
}
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if (argv.hostname === '') {
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Utils.fatalError('Provided hostname argument has no value')
}
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if (argv.help) {
console.log(`
Description
Starts the application in development mode (hot-code reloading, error
reporting, etc)
Usage
$ nuxt dev <dir> -p <port number> -H <hostname>
Options
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--port, -p A port number on which to start the application
--hostname, -H Hostname on which to start the application
--spa Launch in SPA mode
--universal Launch in Universal mode (default)
--config-file, -c Path to Nuxt.js config file (default: nuxt.config.js)
--help, -h Displays this message
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`)
process.exit(0)
}
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const rootDir = resolve(argv._[0] || '.')
const nuxtConfigFile = resolve(rootDir, argv['config-file'])
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// Load config once for chokidar
const nuxtConfig = loadNuxtConfig()
_.defaultsDeep(nuxtConfig, { watchers: { chokidar: { ignoreInitial: true } } })
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// Start dev
let dev = startDev()
let needToRestart = false
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// Start watching for nuxt.config.js changes
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chokidar.watch(nuxtConfigFile, nuxtConfig.watchers.chokidar).on('all', () => {
debug('[nuxt.config.js] changed')
needToRestart = true
dev = dev.then(instance => {
if (needToRestart === false) return instance
needToRestart = false
debug('Rebuilding the app...')
return startDev(instance)
})
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})
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function startDev(oldInstance) {
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// Get latest environment variables
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const port =
argv.port || process.env.PORT || process.env.npm_package_config_nuxt_port
const host =
argv.hostname ||
process.env.HOST ||
process.env.npm_package_config_nuxt_host
// Error handler
const onError = (err, instance) => {
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Utils.printError(err)
return Promise.resolve(instance) // Wait for next reload
}
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// Load options
let options = {}
try {
options = loadNuxtConfig()
} catch (err) {
return onError(err, oldInstance)
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}
// Create nuxt and builder instance
let nuxt
let builder
let instance
try {
nuxt = new Nuxt(options)
builder = new Builder(nuxt)
instance = { nuxt: nuxt, builder: builder }
} catch (err) {
return onError(err, instance || oldInstance)
}
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return (
Promise.resolve()
.then(
() =>
oldInstance && oldInstance.builder
? oldInstance.builder.unwatch()
: Promise.resolve()
)
// Start build
.then(() => builder.build())
// Close old nuxt after successful build
.then(
() =>
oldInstance && oldInstance.nuxt
? oldInstance.nuxt.close()
: Promise.resolve()
)
// Start listening
.then(() => nuxt.listen(port, host))
// Pass new nuxt to watch chain
.then(() => instance)
// Handle errors
.catch(err => onError(err, instance))
)
}
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function loadNuxtConfig() {
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let options = {}
if (fs.existsSync(nuxtConfigFile)) {
delete require.cache[nuxtConfigFile]
options = require(nuxtConfigFile)
} else if (argv['config-file'] !== 'nuxt.config.js') {
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Utils.fatalError('Could not load config file: ' + argv['config-file'])
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}
if (typeof options.rootDir !== 'string') {
options.rootDir = rootDir
}
// Force development mode for add hot reloading and watching changes
options.dev = true
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// Nuxt Mode
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options.mode =
(argv['spa'] && 'spa') || (argv['universal'] && 'universal') || options.mode
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return options
}