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next.js/build/index.js
Steve Korshakov 7fcfb8bde9 Make production compilation faster (patch) (#4677)
I have spend whole day on profiling next.js compiling performance and one of the easy hacks to reduce built time is avoid doing full `stats.toJson()` that is heavy by default.
2018-06-27 10:34:15 +02:00

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JavaScript

import { join } from 'path'
import promisify from '../lib/promisify'
import fs from 'fs'
import webpack from 'webpack'
import loadConfig from '../server/config'
import { PHASE_PRODUCTION_BUILD, BUILD_ID_FILE } from '../lib/constants'
import getBaseWebpackConfig from './webpack'
const access = promisify(fs.access)
const writeFile = promisify(fs.writeFile)
export default async function build (dir, conf = null) {
const config = loadConfig(PHASE_PRODUCTION_BUILD, dir, conf)
const buildId = await config.generateBuildId() // defaults to a uuid
const distDir = join(dir, config.distDir)
try {
await access(dir, (fs.constants || fs).W_OK)
} catch (err) {
console.error(`> Failed, build directory is not writeable. https://err.sh/zeit/next.js/build-dir-not-writeable`)
throw err
}
try {
const configs = await Promise.all([
getBaseWebpackConfig(dir, { buildId, isServer: false, config }),
getBaseWebpackConfig(dir, { buildId, isServer: true, config })
])
await runCompiler(configs)
await writeBuildId(distDir, buildId)
} catch (err) {
console.error(`> Failed to build`)
throw err
}
}
function runCompiler (compiler) {
return new Promise(async (resolve, reject) => {
const webpackCompiler = await webpack(await compiler)
webpackCompiler.run((err, stats) => {
if (err) return reject(err)
const jsonStats = stats.toJson('errors-only')
if (jsonStats.errors.length > 0) {
const error = new Error(jsonStats.errors[0])
error.errors = jsonStats.errors
error.warnings = jsonStats.warnings
return reject(error)
}
resolve(jsonStats)
})
})
}
async function writeBuildId (distDir, buildId) {
const buildIdPath = join(distDir, BUILD_ID_FILE)
await writeFile(buildIdPath, buildId, 'utf8')
}