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feat: check whether to build before preview #11570

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feat: check whether to build before preview #11570

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10 changes: 9 additions & 1 deletion packages/vite/src/node/preview.ts
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@@ -1,4 +1,5 @@
import path from 'node:path'
import fs from 'node:fs'
import type * as http from 'node:http'
import sirv from 'sirv'
import connect from 'connect'
Expand Down Expand Up @@ -83,6 +84,14 @@ export async function preview(
'production',
)

const distDir = path.resolve(config.root, config.build.outDir)
const isAlreadyBuild = fs.existsSync(distDir)
if (!isAlreadyBuild) {
throw Error(
'The outputDir cannot be found, please try again after building',
)
}

const app = connect() as Connect.Server
const httpServer = await resolveHttpServer(
config.preview,
Expand Down Expand Up @@ -115,7 +124,6 @@ export async function preview(
config.base === './' || config.base === '' ? '/' : config.base

// static assets
const distDir = path.resolve(config.root, config.build.outDir)
const headers = config.preview.headers
const assetServer = sirv(distDir, {
etag: true,
Expand Down