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preview.ts
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preview.ts
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import fs from 'node:fs'
import path from 'node:path'
import type * as http from 'node:http'
import sirv from 'sirv'
import connect from 'connect'
import type { Connect } from 'dep-types/connect'
import corsMiddleware from 'cors'
import type { ResolvedServerOptions, ResolvedServerUrls } from './server'
import type { CommonServerOptions } from './http'
import {
httpServerStart,
resolveHttpServer,
resolveHttpsConfig,
setClientErrorHandler,
} from './http'
import { openBrowser } from './server/openBrowser'
import compression from './server/middlewares/compression'
import { proxyMiddleware } from './server/middlewares/proxy'
import { resolveHostname, resolveServerUrls, shouldServeFile } from './utils'
import { printServerUrls } from './logger'
import { DEFAULT_PREVIEW_PORT } from './constants'
import { resolveConfig } from '.'
import type { InlineConfig, ResolvedConfig } from '.'
export interface PreviewOptions extends CommonServerOptions {}
export interface ResolvedPreviewOptions extends PreviewOptions {}
export function resolvePreviewOptions(
preview: PreviewOptions | undefined,
server: ResolvedServerOptions,
): ResolvedPreviewOptions {
// The preview server inherits every CommonServerOption from the `server` config
// except for the port to enable having both the dev and preview servers running
// at the same time without extra configuration
return {
port: preview?.port,
strictPort: preview?.strictPort ?? server.strictPort,
host: preview?.host ?? server.host,
https: preview?.https ?? server.https,
open: preview?.open ?? server.open,
proxy: preview?.proxy ?? server.proxy,
cors: preview?.cors ?? server.cors,
headers: preview?.headers ?? server.headers,
}
}
export interface PreviewServer {
/**
* The resolved vite config object
*/
config: ResolvedConfig
/**
* native Node http server instance
*/
httpServer: http.Server
/**
* The resolved urls Vite prints on the CLI
*/
resolvedUrls: ResolvedServerUrls
/**
* Print server urls
*/
printUrls(): void
}
export type PreviewServerHook = (
this: void,
server: {
middlewares: Connect.Server
httpServer: http.Server
},
) => (() => void) | void | Promise<(() => void) | void>
/**
* Starts the Vite server in preview mode, to simulate a production deployment
*/
export async function preview(
inlineConfig: InlineConfig = {},
): Promise<PreviewServer> {
const config = await resolveConfig(
inlineConfig,
'serve',
'production',
'production',
)
const distDir = path.resolve(config.root, config.build.outDir)
if (
!fs.existsSync(distDir) &&
// error if no plugins implement `configurePreviewServer`
config.plugins.every((plugin) => !plugin.configurePreviewServer) &&
// error if called in CLI only. programmatic usage could access `httpServer`
// and affect file serving
process.argv[1]?.endsWith(path.normalize('bin/vite.js')) &&
process.argv[2] === 'preview'
) {
throw new Error(
`The directory "${config.build.outDir}" does not exist. Did you build your project?`,
)
}
const app = connect() as Connect.Server
const httpServer = await resolveHttpServer(
config.preview,
app,
await resolveHttpsConfig(config.preview?.https),
)
setClientErrorHandler(httpServer, config.logger)
// apply server hooks from plugins
const postHooks: ((() => void) | void)[] = []
for (const hook of config.getSortedPluginHooks('configurePreviewServer')) {
postHooks.push(await hook({ middlewares: app, httpServer }))
}
// cors
const { cors } = config.preview
if (cors !== false) {
app.use(corsMiddleware(typeof cors === 'boolean' ? {} : cors))
}
// proxy
const { proxy } = config.preview
if (proxy) {
app.use(proxyMiddleware(httpServer, proxy, config))
}
app.use(compression())
const previewBase =
config.base === './' || config.base === '' ? '/' : config.base
// static assets
const headers = config.preview.headers
const assetServer = sirv(distDir, {
etag: true,
dev: true,
single: config.appType === 'spa',
setHeaders(res) {
if (headers) {
for (const name in headers) {
res.setHeader(name, headers[name]!)
}
}
},
shouldServe(filePath) {
return shouldServeFile(filePath, distDir)
},
})
app.use(previewBase, assetServer)
// apply post server hooks from plugins
postHooks.forEach((fn) => fn && fn())
const options = config.preview
const hostname = await resolveHostname(options.host)
const port = options.port ?? DEFAULT_PREVIEW_PORT
const protocol = options.https ? 'https' : 'http'
const logger = config.logger
const serverPort = await httpServerStart(httpServer, {
port,
strictPort: options.strictPort,
host: hostname.host,
logger,
})
const resolvedUrls = await resolveServerUrls(
httpServer,
config.preview,
config,
)
if (options.open) {
const path = typeof options.open === 'string' ? options.open : previewBase
openBrowser(
path.startsWith('http')
? path
: new URL(path, `${protocol}://${hostname.name}:${serverPort}`).href,
true,
logger,
)
}
return {
config,
httpServer,
resolvedUrls,
printUrls() {
printServerUrls(resolvedUrls, options.host, logger.info)
},
}
}