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