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next.js/server/build/index.js

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import { tmpdir } from 'os'
import { join } from 'path'
import fs from 'mz/fs'
import uuid from 'uuid'
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import del from 'del'
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import webpack from './webpack'
import replaceCurrentBuild from './replace'
import md5File from 'md5-file/promise'
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export default async function build (dir, conf = null) {
const buildId = uuid.v4()
const tempDir = tmpdir()
const buildDir = join(tempDir, uuid.v4())
try {
await fs.access(tempDir, 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 compiler = await webpack(dir, { buildId, buildDir, conf })
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try {
const stats = await runCompiler(compiler)
await writeBuildStats(buildDir, stats)
await writeBuildId(buildDir, buildId)
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} catch (err) {
console.error(`> Failed to build on ${buildDir}`)
throw err
}
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await replaceCurrentBuild(dir, buildDir)
// no need to wait
del(buildDir, { force: true })
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}
function runCompiler (compiler) {
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return new Promise((resolve, reject) => {
compiler.run((err, stats) => {
if (err) return reject(err)
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const jsonStats = stats.toJson()
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if (jsonStats.errors.length > 0) {
const error = new Error(jsonStats.errors[0])
error.errors = jsonStats.errors
error.warnings = jsonStats.warnings
return reject(error)
}
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resolve(jsonStats)
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})
})
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}
async function writeBuildStats (dir, stats) {
// Here we can't use hashes in webpack chunks.
// That's because the "app.js" is not tied to a chunk.
// It's created by merging a few assets. (commons.js and main.js)
// So, we need to generate the hash ourself.
const assetHashMap = {
'app.js': {
hash: await md5File(join(dir, '.next', 'app.js'))
}
}
const buildStatsPath = join(dir, '.next', 'build-stats.json')
await fs.writeFile(buildStatsPath, JSON.stringify(assetHashMap), 'utf8')
const statsPath = join(dir, '.next', 'webpack-stats.json')
await fs.writeFile(statsPath, JSON.stringify(stats), 'utf8')
}
async function writeBuildId (dir, buildId) {
const buildIdPath = join(dir, '.next', 'BUILD_ID')
await fs.writeFile(buildIdPath, buildId, 'utf8')
}