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const os = require('os')
const path = require('path')
const execa = require('execa')
const fsp = require('fs/promises')
const prettyBytes = require('pretty-bytes')
const gzipSize = require('next/dist/compiled/gzip-size')
const { nodeFileTrace } = require('next/dist/compiled/@vercel/nft')
const { linkPackages } =
require('../.github/actions/next-stats-action/src/prepare/repo-setup')()
const MAX_COMPRESSED_SIZE = 250 * 1000
const MAX_UNCOMPRESSED_SIZE = 2.5 * 1000 * 1000
// install next outside the monorepo for clean `node_modules`
// to trace against which helps ensure minimal trace is
// produced.
// react and react-dom need to be traced specific to installed
// version so isn't pre-traced
async function main() {
const tmpdir = os.tmpdir()
const origRepoDir = path.join(__dirname, '..')
const repoDir = path.join(tmpdir, `tmp-next-${Date.now()}`)
const workDir = path.join(tmpdir, `trace-next-${Date.now()}`)
const origTestDir = path.join(origRepoDir, 'test')
const dotDir = path.join(origRepoDir, './') + '.'
await fsp.cp(origRepoDir, repoDir, {
filter: (item) => {
return (
!item.startsWith(origTestDir) &&
!item.startsWith(dotDir) &&
!item.includes('node_modules')
)
},
force: true,
recursive: true,
})
console.log('using workdir', workDir)
console.log('using repodir', repoDir)
await fsp.mkdir(workDir, { recursive: true })
const pkgPaths = await linkPackages({
repoDir: origRepoDir,
nextSwcVersion: null,
})
await fsp.writeFile(
path.join(workDir, 'package.json'),
JSON.stringify(
{
dependencies: {
next: pkgPaths.get('next'),
},
private: true,
},
null,
2
)
)
await execa('yarn', ['install'], {
cwd: workDir,
stdio: ['ignore', 'inherit', 'inherit'],
env: {
...process.env,
YARN_CACHE_FOLDER: path.join(workDir, '.yarn-cache'),
},
})
const nextServerPath = path.join(
workDir,
'node_modules/next/dist/server/next-server.js'
)
const traceLabel = `traced ${nextServerPath}`
console.time(traceLabel)
const result = await nodeFileTrace([nextServerPath], {
base: workDir,
processCwd: workDir,
ignore: [
'node_modules/next/dist/pages/**/*',
'node_modules/next/dist/server/image-optimizer.js',
'node_modules/next/dist/compiled/@ampproject/toolbox-optimizer/**/*',
'node_modules/next/dist/compiled/webpack/(bundle4|bundle5).js',
'node_modules/react/**/*.development.js',
'node_modules/react-dom/**/*.development.js',
'node_modules/use-subscription/**/*.development.js',
'node_modules/sharp/**/*',
],
})
const tracedDeps = new Set()
let totalCompressedSize = 0
let totalUncompressedSize = 0
for (const file of result.fileList) {
if (result.reasons.get(file).type === 'initial') {
continue
}
tracedDeps.add(file.replace(/\\/g, '/'))
const stat = await fsp.stat(path.join(workDir, file))
if (stat.isFile()) {
const compressedSize = await gzipSize(path.join(workDir, file))
totalUncompressedSize += stat.size || 0
totalCompressedSize += compressedSize
} else {
console.log('not a file', file, stat.isDirectory())
}
}
console.log({
numberFiles: tracedDeps.size,
totalGzipSize: prettyBytes(totalCompressedSize),
totalUncompressedSize: prettyBytes(totalUncompressedSize),
})
await fsp.writeFile(
path.join(
__dirname,
'../packages/next/dist/server/next-server.js.nft.json'
),
JSON.stringify({
files: Array.from(tracedDeps),
version: 1,
})
)
await fsp.rm(workDir, { recursive: true, force: true })
await fsp.rm(repoDir, { recursive: true, force: true })
console.timeEnd(traceLabel)
if (
totalCompressedSize > MAX_COMPRESSED_SIZE ||
totalUncompressedSize > MAX_UNCOMPRESSED_SIZE
) {
throw new Error(
`Max traced size of next-server exceeded limits of ${MAX_COMPRESSED_SIZE} compressed or ${MAX_UNCOMPRESSED_SIZE} uncompressed`
)
}
}
main()
.then(() => console.log('done'))
.catch(console.error)
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