import { join } from 'path' import promisify from '../lib/promisify' import fs from 'fs' import webpack from 'webpack' import loadConfig from 'next-server/next-config' import { PHASE_PRODUCTION_BUILD, BUILD_ID_FILE } from 'next-server/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() }) }) } async function writeBuildId (distDir, buildId) { const buildIdPath = join(distDir, BUILD_ID_FILE) await writeFile(buildIdPath, buildId, 'utf8') }