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config.ts
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config.ts
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import { resolve } from 'node:path'
import type { ResolvedConfig } from 'vite'
import type { ManifestTransform } from 'workbox-build'
import type { VitePWAOptions } from 'vite-plugin-pwa'
import type { KitOptions } from './types'
export function configureSvelteKitOptions(
kit: KitOptions,
viteOptions: ResolvedConfig,
options: Partial<VitePWAOptions>,
) {
const {
base = viteOptions.base ?? '/',
adapterFallback,
outDir = `${viteOptions.root}/.svelte-kit`,
assets = 'static',
} = kit
// Vite will copy public folder to the globDirectory after pwa plugin runs:
// globDirectory is the build folder.
// SvelteKit will copy to the globDirectory before pwa plugin runs (via Vite client build in writeBundle hook):
// globDirectory is the kit client output folder.
// We need to disable includeManifestIcons: any icon in the static folder will be twice in the sw's precache manifest.
if (typeof options.includeManifestIcons === 'undefined')
options.includeManifestIcons = false
let config: Partial<
import('workbox-build').BasePartial
& import('workbox-build').GlobPartial
& import('workbox-build').RequiredGlobDirectoryPartial
>
if (options.strategies === 'injectManifest') {
if (!options.srcDir)
options.srcDir = 'src'
if (!options.filename)
options.filename = 'service-worker.js'
options.injectManifest = options.injectManifest ?? {}
config = options.injectManifest
}
else {
options.workbox = options.workbox ?? {}
// the user may want to disable offline support
if (!('navigateFallback' in options.workbox))
options.workbox.navigateFallback = adapterFallback ?? base
config = options.workbox
}
// SvelteKit outDir is `.svelte-kit/output/client`.
// We need to include the parent folder since SvelteKit will generate SSG in `.svelte-kit/output/prerendered` folder.
if (!config.globDirectory)
config.globDirectory = `${outDir}/output`
let buildAssetsDir = kit.appDir ?? '_app/'
if (buildAssetsDir[0] === '/')
buildAssetsDir = buildAssetsDir.slice(1)
if (buildAssetsDir[buildAssetsDir.length - 1] !== '/')
buildAssetsDir += '/'
if (!config.modifyURLPrefix) {
config.globPatterns = buildGlobPatterns(config.globPatterns)
if (kit.includeVersionFile)
config.globPatterns.push(`client/${buildAssetsDir}version.json`)
}
// exclude server assets: sw is built on SSR build
config.globIgnores = buildGlobIgnores(config.globIgnores)
// Vite 5 support: allow override dontCacheBustURLsMatching
if (!('dontCacheBustURLsMatching' in config))
config.dontCacheBustURLsMatching = new RegExp(`${buildAssetsDir}immutable/`)
if (!config.manifestTransforms) {
config.manifestTransforms = [createManifestTransform(
base,
options.strategies === 'injectManifest'
? undefined
: (options.manifestFilename ?? 'manifest.webmanifest'),
kit,
)]
}
if (options.pwaAssets) {
options.pwaAssets.integration = {
baseUrl: base,
publicDir: resolve(viteOptions.root, assets),
outDir: resolve(outDir, 'output/client'),
}
}
}
function createManifestTransform(base: string, webManifestName?: string, options?: KitOptions): ManifestTransform {
return async (entries) => {
const defaultAdapterFallback = 'prerendered/fallback.html'
const suffix = options?.trailingSlash === 'always' ? '/' : ''
let adapterFallback = options?.adapterFallback
let excludeFallback = false
// the fallback will be always generated by SvelteKit.
// The adapter will copy the fallback only if it is provided in its options: we need to exclude it
if (!adapterFallback) {
adapterFallback = defaultAdapterFallback
excludeFallback = true
}
// the fallback will be always in .svelte-kit/output/prerendered/fallback.html
const manifest = entries
.filter(({ url }) => !(excludeFallback && url === defaultAdapterFallback))
.map((e) => {
let url = e.url
// client assets in `.svelte-kit/output/client` folder.
// SSG pages in `.svelte-kit/output/prerendered/pages` folder.
// fallback page in `.svelte-kit/output/prerendered` folder (fallback.html is the default).
if (url.startsWith('client/'))
url = url.slice(7)
else if (url.startsWith('prerendered/pages/'))
url = url.slice(18)
else if (url === defaultAdapterFallback)
url = adapterFallback!
if (url.endsWith('.html')) {
if (url.startsWith('/'))
url = url.slice(1)
if (url === 'index.html') {
url = base
}
else {
const idx = url.lastIndexOf('/')
if (idx > -1) {
// abc/index.html -> abc/?
if (url.endsWith('/index.html'))
url = `${url.slice(0, idx)}${suffix}`
// abc/def.html -> abc/def/?
else
url = `${url.substring(0, url.lastIndexOf('.'))}${suffix}`
}
else {
// xxx.html -> xxx/?
url = `${url.substring(0, url.lastIndexOf('.'))}${suffix}`
}
}
}
e.url = url
return e
})
if (!webManifestName)
return { manifest }
return { manifest: manifest.filter(e => e.url !== webManifestName) }
}
}
function buildGlobPatterns(globPatterns?: string[]) {
if (globPatterns) {
if (!globPatterns.some(g => g.startsWith('prerendered/')))
globPatterns.push('prerendered/**/*.html')
if (!globPatterns.some(g => g.startsWith('client/')))
globPatterns.push('client/**/*.{js,css,ico,png,svg,webp,webmanifest}')
if (!globPatterns.some(g => g.includes('webmanifest')))
globPatterns.push('client/*.webmanifest')
return globPatterns
}
return ['client/**/*.{js,css,ico,png,svg,webp,webmanifest}', 'prerendered/**/*.html']
}
function buildGlobIgnores(globIgnores?: string[]) {
if (globIgnores) {
if (!globIgnores.some(g => g.startsWith('server/')))
globIgnores.push('server/**')
return globIgnores
}
return ['server/**']
}