Measure if final compressed build is under 13KB (originally meant for js13k game competition)

postbuild.js

const fs = require('fs')
const archiver = require('archiver')

const MAX = 13 * 1024 // 13kb

const output = fs.createWriteStream(`${__dirname}/dist/build.zip`)
const archive = archiver('zip', {
	zlib: { level: 9 } // set compression to best
})

archive.pipe(output)
archive.glob('**/!(*.map|*.zip)', { cwd: './dist' })
archive.finalize()

output.on('close', () => {
	const bytes = archive.pointer()
	const percent = (bytes / MAX * 100).toFixed(2)

	if (bytes > MAX) {
		console.error(`Size overflow: ${bytes} bytes (${percent}%)`)
	} else {
		console.log(`Size: ${bytes} bytes (${percent}%)`)
	}
})

archive.on('warning', (err) => {
	if (err.code === 'ENOENT') {
		console.warn(err)
	} else {
		throw err
	}
})
archive.on('error', err => {
	throw err
})