import { tmpdir } from 'os' import { join } from 'path' import fs from 'mz/fs' import uuid from 'uuid' import del from 'del' import webpack from './webpack' import replaceCurrentBuild from './replace' export default async function build (dir) { const buildDir = join(tmpdir(), uuid.v4()) const compiler = await webpack(dir, { buildDir }) try { await runCompiler(compiler) await writeBuildId(buildDir) } catch (err) { console.error(`> Failed to build on ${buildDir}`) throw err } await replaceCurrentBuild(dir, buildDir) // no need to wait del(buildDir, { force: true }) } function runCompiler (compiler) { return new Promise((resolve, reject) => { compiler.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() }) }) } async function writeBuildId (dir) { const buildIdPath = join(dir, '.next', 'BUILD_ID') const buildId = uuid.v4() await fs.writeFile(buildIdPath, buildId, 'utf8') }