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next.js/server/build/gzip.js

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import fs from 'fs'
import path from 'path'
import zlib from 'zlib'
import glob from 'glob-promise'
export default async function gzipAssets (dir, buildFolder = '.next') {
const nextDir = path.resolve(dir, buildFolder)
const coreAssets = [
path.join(nextDir, 'commons.js'),
path.join(nextDir, 'main.js')
]
const pages = await glob('bundles/pages/**/*.json', { cwd: nextDir })
const allAssets = [
...coreAssets,
...pages.map(page => path.join(nextDir, page))
]
while (true) {
// gzip only 10 assets in parallel at a time.
const currentChunk = allAssets.splice(0, 10)
if (currentChunk.length === 0) break
await Promise.all(currentChunk.map(gzip))
}
}
export function gzip (filePath) {
const input = fs.createReadStream(filePath)
const output = fs.createWriteStream(`${filePath}.gz`)
return new Promise((resolve, reject) => {
const stream = input.pipe(zlib.createGzip()).pipe(output)
stream.on('error', reject)
stream.on('finish', resolve)
})
}