import { join } from 'path'
import fs from 'mz/fs'
import uuid from 'uuid'
import webpack from 'webpack'
import getConfig from '../config'
import {PHASE_PRODUCTION_BUILD} from '../../lib/constants'
import getBaseWebpackConfig from './webpack'
export default async function build (dir, conf = null) {
const config = getConfig(PHASE_PRODUCTION_BUILD, dir, conf)
const buildId = uuid.v4()
try {
await fs.access(dir, fs.constants.W_OK)
} catch (err) {
console.error(`> Failed, build directory is not writeable. https://err.sh/zeit/next.js/build-dir-not-writeable`)
throw err
}
const configs = await Promise.all([
getBaseWebpackConfig(dir, { buildId, isServer: false, config }),
getBaseWebpackConfig(dir, { buildId, isServer: true, config })
])
await runCompiler(configs)
await writeBuildId(dir, buildId, config)
console.error(`> Failed to build`)
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()
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 (dir, buildId, config) {
const buildIdPath = join(dir, config.distDir, 'BUILD_ID')
await fs.writeFile(buildIdPath, buildId, 'utf8')