/
server.ts
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/
server.ts
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import { performance } from 'node:perf_hooks'
import { existsSync } from 'node:fs'
import { join, relative, resolve } from 'pathe'
import type { TransformResult, ViteDevServer } from 'vite'
import createDebug from 'debug'
import type { EncodedSourceMap } from '@jridgewell/trace-mapping'
import type { DebuggerOptions, FetchResult, ViteNodeResolveId, ViteNodeServerOptions } from './types'
import { shouldExternalize } from './externalize'
import { normalizeModuleId, toArray, toFilePath } from './utils'
import { Debugger } from './debug'
import { withInlineSourcemap } from './source-map'
export * from './externalize'
const debugRequest = createDebug('vite-node:server:request')
export class ViteNodeServer {
private fetchPromiseMap = new Map<string, Promise<FetchResult>>()
private transformPromiseMap = new Map<string, Promise<TransformResult | null | undefined>>()
private existingOptimizedDeps = new Set<string>()
fetchCache = new Map<string, {
duration?: number
timestamp: number
result: FetchResult
}>()
externalizeCache = new Map<string, Promise<string | false>>()
debugger?: Debugger
constructor(
public server: ViteDevServer,
public options: ViteNodeServerOptions = {},
) {
// eslint-disable-next-line @typescript-eslint/prefer-ts-expect-error
// @ts-ignore ssr is not typed in Vite 2, but defined in Vite 3, so we can't use expect-error
const ssrOptions = server.config.ssr
options.deps ??= {}
options.deps.cacheDir = relative(server.config.root, server.config.cacheDir)
if (ssrOptions) {
// we don't externalize ssr, because it has different semantics in Vite
// if (ssrOptions.external) {
// options.deps.external ??= []
// options.deps.external.push(...ssrOptions.external)
// }
if (ssrOptions.noExternal === true) {
options.deps.inline ??= true
}
else if (options.deps.inline !== true) {
options.deps.inline ??= []
options.deps.inline.push(...toArray(ssrOptions.noExternal))
}
}
if (process.env.VITE_NODE_DEBUG_DUMP) {
options.debug = Object.assign(<DebuggerOptions>{
dumpModules: !!process.env.VITE_NODE_DEBUG_DUMP,
loadDumppedModules: process.env.VITE_NODE_DEBUG_DUMP === 'load',
}, options.debug ?? {})
}
if (options.debug)
this.debugger = new Debugger(server.config.root, options.debug!)
}
shouldExternalize(id: string) {
return shouldExternalize(id, this.options.deps, this.externalizeCache)
}
private async ensureExists(id: string): Promise<boolean> {
if (this.existingOptimizedDeps.has(id))
return true
if (existsSync(id)) {
this.existingOptimizedDeps.add(id)
return true
}
return new Promise<boolean>((resolve) => {
setTimeout(() => {
this.ensureExists(id).then(() => {
resolve(true)
})
})
})
}
async resolveId(id: string, importer?: string, transformMode?: 'web' | 'ssr'): Promise<ViteNodeResolveId | null> {
if (importer && !importer.startsWith(this.server.config.root))
importer = resolve(this.server.config.root, importer)
const mode = transformMode ?? ((importer && this.getTransformMode(importer)) || 'ssr')
return this.server.pluginContainer.resolveId(id, importer, { ssr: mode === 'ssr' })
}
getSourceMap(source: string) {
const fetchResult = this.fetchCache.get(source)?.result
if (fetchResult?.map)
return fetchResult.map
const ssrTransformResult = this.server.moduleGraph.getModuleById(source)?.ssrTransformResult
return (ssrTransformResult?.map || null) as unknown as EncodedSourceMap | null
}
async fetchModule(id: string, transformMode?: 'web' | 'ssr'): Promise<FetchResult> {
id = normalizeModuleId(id)
// reuse transform for concurrent requests
if (!this.fetchPromiseMap.has(id)) {
this.fetchPromiseMap.set(id,
this._fetchModule(id, transformMode)
.then((r) => {
return this.options.sourcemap !== true ? { ...r, map: undefined } : r
})
.finally(() => {
this.fetchPromiseMap.delete(id)
}),
)
}
return this.fetchPromiseMap.get(id)!
}
async transformRequest(id: string) {
// reuse transform for concurrent requests
if (!this.transformPromiseMap.has(id)) {
this.transformPromiseMap.set(id,
this._transformRequest(id)
.finally(() => {
this.transformPromiseMap.delete(id)
}),
)
}
return this.transformPromiseMap.get(id)!
}
getTransformMode(id: string) {
const withoutQuery = id.split('?')[0]
if (this.options.transformMode?.web?.some(r => withoutQuery.match(r)))
return 'web'
if (this.options.transformMode?.ssr?.some(r => withoutQuery.match(r)))
return 'ssr'
if (withoutQuery.match(/\.([cm]?[jt]sx?|json)$/))
return 'ssr'
return 'web'
}
private async _fetchModule(id: string, transformMode?: 'web' | 'ssr'): Promise<FetchResult> {
let result: FetchResult
const cacheDir = this.options.deps?.cacheDir
if (cacheDir && id.includes(cacheDir)) {
if (!id.startsWith(this.server.config.root))
id = join(this.server.config.root, id)
const timeout = setTimeout(() => {
throw new Error(`ViteNodeServer: ${id} not found. This is a bug, please report it.`)
}, 5000) // CI can be quite slow
await this.ensureExists(id)
clearTimeout(timeout)
}
const { path: filePath } = toFilePath(id, this.server.config.root)
const module = this.server.moduleGraph.getModuleById(id)
const timestamp = module ? module.lastHMRTimestamp : null
const cache = this.fetchCache.get(filePath)
if (timestamp && cache && cache.timestamp >= timestamp)
return cache.result
const time = Date.now()
const externalize = await this.shouldExternalize(filePath)
let duration: number | undefined
if (externalize) {
result = { externalize }
this.debugger?.recordExternalize(id, externalize)
}
else {
const start = performance.now()
const r = await this._transformRequest(id, transformMode)
duration = performance.now() - start
result = { code: r?.code, map: r?.map as any }
}
this.fetchCache.set(filePath, {
duration,
timestamp: time,
result,
})
return result
}
private async _transformRequest(id: string, customTransformMode?: 'web' | 'ssr') {
debugRequest(id)
let result: TransformResult | null = null
if (this.options.debug?.loadDumppedModules) {
result = await this.debugger?.loadDump(id) ?? null
if (result)
return result
}
const transformMode = customTransformMode ?? this.getTransformMode(id)
if (transformMode === 'web') {
// for components like Vue, we want to use the client side
// plugins but then convert the code to be consumed by the server
result = await this.server.transformRequest(id)
if (result)
result = await this.server.ssrTransform(result.code, result.map, id)
}
else {
result = await this.server.transformRequest(id, { ssr: true })
}
const sourcemap = this.options.sourcemap ?? 'inline'
if (sourcemap === 'inline' && result && !id.includes('node_modules'))
withInlineSourcemap(result)
if (this.options.debug?.dumpModules)
await this.debugger?.dumpFile(id, result)
return result
}
}