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dev.ts
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import process from 'node:process'
import type { Plugin, Update, ViteDevServer } from 'vite'
import type { GenerateResult, UnocssPluginContext } from '@unocss/core'
import { notNull } from '@unocss/core'
import MagicString from 'magic-string'
import type { VitePluginConfig } from '../../types'
import { LAYER_MARK_ALL, getHash, getPath, resolveId, resolveLayer } from '../../integration'
const WARN_TIMEOUT = 20000
const WS_EVENT_PREFIX = 'unocss:hmr'
const HASH_LENGTH = 6
export function GlobalModeDevPlugin({ uno, tokens, tasks, flushTasks, affectedModules, onInvalidate, extract, filter, getConfig }: UnocssPluginContext): Plugin[] {
const servers: ViteDevServer[] = []
const entries = new Set<string>()
let invalidateTimer: any
const lastServedHash = new Map<string, string>()
let lastServedTime = Date.now()
let resolved = false
let resolvedWarnTimer: any
async function generateCSS(layer: string) {
await flushTasks()
let result: GenerateResult
let tokensSize = tokens.size
do {
result = await uno.generate(tokens)
// to capture new tokens created during generation
if (tokensSize === tokens.size)
break
tokensSize = tokens.size
} while (true)
const css = layer === LAYER_MARK_ALL
? result.getLayers(undefined, Array.from(entries)
.map(i => resolveLayer(i)).filter((i): i is string => !!i))
: result.getLayer(layer)
const hash = getHash(css || '', HASH_LENGTH)
lastServedHash.set(layer, hash)
lastServedTime = Date.now()
return { hash, css }
}
function invalidate(timer = 10, ids: Set<string> = entries) {
for (const server of servers) {
for (const id of ids) {
const mod = server.moduleGraph.getModuleById(id)
if (!mod)
continue
server!.moduleGraph.invalidateModule(mod)
}
}
clearTimeout(invalidateTimer)
invalidateTimer = setTimeout(() => {
lastServedHash.clear()
sendUpdate(ids)
}, timer)
}
function sendUpdate(ids: Set<string>) {
for (const server of servers) {
server.ws.send({
type: 'update',
updates: Array.from(ids)
.map((id) => {
const mod = server.moduleGraph.getModuleById(id)
if (!mod)
return null
return {
acceptedPath: mod.url,
path: mod.url,
timestamp: lastServedTime,
type: 'js-update',
} as Update
})
.filter(notNull),
})
}
}
function setWarnTimer() {
if (!resolved && !resolvedWarnTimer) {
resolvedWarnTimer = setTimeout(() => {
if (process.env.TEST || process.env.NODE_ENV === 'test')
return
if (!resolved) {
const msg = '[unocss] Entry module not found. Did you add `import \'uno.css\'` in your main entry?'
console.warn(msg)
servers.forEach(({ ws }) => ws.send({
type: 'error',
err: { message: msg, stack: '' },
}))
}
}, WARN_TIMEOUT)
}
}
function clearWarnTimer() {
if (resolvedWarnTimer) {
clearTimeout(resolvedWarnTimer)
resolvedWarnTimer = undefined
}
}
onInvalidate(() => {
invalidate(10, new Set([...entries, ...affectedModules]))
})
return [
{
name: 'unocss:global',
apply: 'serve',
enforce: 'pre',
async configureServer(_server) {
servers.push(_server)
_server.ws.on(WS_EVENT_PREFIX, async ([layer]: string[]) => {
const preHash = lastServedHash.get(layer)
await generateCSS(layer)
if (lastServedHash.get(layer) !== preHash)
sendUpdate(entries)
})
},
buildStart() {
// warm up for preflights
uno.generate([], { preflights: true })
},
transform(code, id) {
if (filter(code, id))
tasks.push(extract(code, id))
return null
},
transformIndexHtml: {
order: 'pre',
handler(code, { filename }) {
setWarnTimer()
tasks.push(extract(code, filename))
},
// Compatibility with Legacy Vite
enforce: 'pre',
transform(code, { filename }) {
setWarnTimer()
tasks.push(extract(code, filename))
},
},
resolveId(id) {
const entry = resolveId(id)
if (entry) {
resolved = true
clearWarnTimer()
entries.add(entry)
return entry
}
},
async load(id) {
const layer = resolveLayer(getPath(id))
if (!layer)
return null
const { hash, css } = await generateCSS(layer)
return {
// add hash to the chunk of CSS that it will send back to client to check if there is new CSS generated
code: `${css}__uno_hash_${hash}{--:'';}`,
map: { mappings: '' },
}
},
closeBundle() {
clearWarnTimer()
},
},
{
name: 'unocss:global:post',
apply(config, env) {
return env.command === 'serve' && !config.build?.ssr
},
enforce: 'post',
async transform(code, id) {
const layer = resolveLayer(getPath(id))
// inject css modules to send callback on css load
if (layer && code.includes('import.meta.hot')) {
let hmr = `
try {
let hash = __vite__css.match(/__uno_hash_(\\w{${HASH_LENGTH}})/)
hash = hash && hash[1]
if (!hash)
console.warn('[unocss-hmr]', 'failed to get unocss hash, hmr might not work')
else
await import.meta.hot.send('${WS_EVENT_PREFIX}', ['${layer}']);
} catch (e) {
console.warn('[unocss-hmr]', e)
}
if (!import.meta.url.includes('?'))
await new Promise(resolve => setTimeout(resolve, 100))`
const config = await getConfig() as VitePluginConfig
if (config.hmrTopLevelAwait === false)
hmr = `;(async function() {${hmr}\n})()`
hmr = `\nif (import.meta.hot) {${hmr}}`
const s = new MagicString(code)
s.append(hmr)
return {
code: s.toString(),
map: s.generateMap() as any,
}
}
},
},
]
}