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transform.ts
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transform.ts
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import { ViteDevServer } from '..'
import { Connect } from 'types/connect'
import {
cleanUrl,
createDebugger,
injectQuery,
isImportRequest,
isJSRequest,
prettifyUrl,
removeImportQuery,
removeTimestampQuery
} from '../../utils'
import { send } from '../send'
import { transformRequest } from '../transformRequest'
import { isHTMLProxy } from '../../plugins/html'
import chalk from 'chalk'
import {
DEP_CACHE_DIR,
DEP_VERSION_RE,
NULL_BYTE_PLACEHOLDER,
VALID_ID_PREFIX
} from '../../constants'
import { pendingDepId } from '../../plugins/resolve'
import { isCSSRequest, isDirectCSSRequest } from '../../plugins/css'
const debugCache = createDebugger('vite:cache')
const isDebug = !!process.env.DEBUG
const knownIgnoreList = new Set(['/', '/favicon.ico'])
export function transformMiddleware(
server: ViteDevServer
): Connect.NextHandleFunction {
const {
config: { root, logger },
moduleGraph
} = server
return async (req, res, next) => {
if (
req.method !== 'GET' ||
req.headers.accept?.includes('text/html') ||
knownIgnoreList.has(req.url!)
) {
return next()
}
if (server._pendingReload && req.url!.endsWith(pendingDepId)) {
// missing dep pending reload, hold request
server._pendingReload.then(() => res.end())
return
}
let url = decodeURI(removeTimestampQuery(req.url!)).replace(
NULL_BYTE_PLACEHOLDER,
'\0'
)
const withoutQuery = cleanUrl(url)
try {
const isSourceMap = withoutQuery.endsWith('.map')
// since we generate source map references, handle those requests here
if (isSourceMap) {
const originalUrl = url.replace(/\.map($|\?)/, '$1')
const map = (await moduleGraph.getModuleByUrl(originalUrl))
?.transformResult?.map
if (map) {
return send(req, res, JSON.stringify(map), 'json')
} else {
return next()
}
}
// warn explicit /public/ paths
if (url.startsWith('/public/')) {
logger.warn(
chalk.yellow(
`files in the public directory are served at the root path.\n` +
`Instead of ${chalk.cyan(url)}, use ${chalk.cyan(
url.replace(/^\/public\//, '/')
)}.`
)
)
}
if (
isJSRequest(url) ||
isImportRequest(url) ||
isCSSRequest(url) ||
isHTMLProxy(url)
) {
// strip ?import
url = removeImportQuery(url)
// Strip valid id prefix. This is preprended to resolved Ids that are
// not valid browser import specifiers by the importAnalysis plugin.
if (url.startsWith(VALID_ID_PREFIX)) {
url = url.slice(VALID_ID_PREFIX.length)
}
// for CSS, we need to differentiate between normal CSS requests and
// imports
if (isCSSRequest(url) && req.headers.accept?.includes('text/css')) {
url = injectQuery(url, 'direct')
}
// check if we can return 304 early
const ifNoneMatch = req.headers['if-none-match']
if (
ifNoneMatch &&
(await moduleGraph.getModuleByUrl(url))?.transformResult?.etag ===
ifNoneMatch
) {
isDebug && debugCache(`[304] ${prettifyUrl(url, root)}`)
res.statusCode = 304
return res.end()
}
// resolve, load and transform using the plugin container
const result = await transformRequest(url, server)
if (result) {
const type = isDirectCSSRequest(url) ? 'css' : 'js'
const isDep =
DEP_VERSION_RE.test(url) ||
url.includes(`node_modules/${DEP_CACHE_DIR}`)
return send(
req,
res,
result.code,
type,
result.etag,
// allow browser to cache npm deps!
isDep ? 'max-age=31536000,immutable' : 'no-cache',
result.map
)
}
}
} catch (e) {
return next(e)
}
next()
}
}