62 lines
2.2 KiB
JavaScript
62 lines
2.2 KiB
JavaScript
const { createHash } = require('crypto')
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const { readdirSync, readFileSync, statSync, writeFileSync } = require('fs')
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const { join } = require('path')
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const getRevision = filePath => createHash('md5').update(readFileSync(filePath)).digest('hex')
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const walkSync = dir => readdirSync(dir, { withFileTypes: true }).flatMap(file =>
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file.isDirectory() ? walkSync(join(dir, file.name)) : join(dir, file.name))
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function formatBytes (bytes, decimals = 2) {
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if (bytes === 0) {
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return '0 B'
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}
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const k = 1024
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const sizes = ['B', 'KB', 'MB']
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const i = Math.floor(Math.log(bytes) / Math.log(k))
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const formattedSize = parseFloat((bytes / Math.pow(k, i)).toFixed(decimals))
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return `${formattedSize} ${sizes[i]}`
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}
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function generatePrecacheManifest () {
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const manifest = []
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let size = 0
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const addToManifest = (filePath, url, s) => {
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const revision = getRevision(filePath)
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manifest.push({ url, revision })
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size += s
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}
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const staticDir = join(__dirname, '../public')
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const staticFiles = walkSync(staticDir)
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const staticMatch = f => [/\.(gif|jpe?g|ico|png|ttf|woff|woff2)$/].some(m => m.test(f))
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staticFiles.filter(staticMatch).forEach(file => {
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const stats = statSync(file)
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addToManifest(file, file.slice(staticDir.length), stats.size)
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})
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const pagesDir = join(__dirname, '../pages')
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const precacheURLs = ['/offline']
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const pagesFiles = walkSync(pagesDir)
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const fileToUrl = f => f.slice(pagesDir.length).replace(/\.js$/, '')
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const pageMatch = f => precacheURLs.some(url => fileToUrl(f) === url)
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pagesFiles.filter(pageMatch).forEach(file => {
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const stats = statSync(file)
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// This is not ideal since dependencies of the pages may have changed
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// but we would still generate the same revision ...
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// The ideal solution would be to create a revision from the file generated by webpack
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// in .next/server/pages but the file may not exist yet when we run this script
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addToManifest(file, fileToUrl(file), stats.size)
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})
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const output = 'sw/precache-manifest.json'
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writeFileSync(output, JSON.stringify(manifest, null, 2))
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console.log(`Created precache manifest at ${output}. Cache will include ${manifest.length} URLs with a size of ${formatBytes(size)}.`)
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}
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module.exports = { generatePrecacheManifest }
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