fix(ssr): improve missing file error

packages/vite/src/node/plugins/importAnalysis.ts

@@ -9,7 +9,6 @@ import { parse as parseJS } from 'acorn'
 import type { Node } from 'estree'
 import { findStaticImports, parseStaticImport } from 'mlly'
 import { makeLegalIdentifier } from '@rollup/pluginutils'
-import { getDepOptimizationConfig } from '..'
 import type { ViteDevServer } from '..'
 import {
   CLIENT_DIR,
@@ -44,6 +43,7 @@ import {
   unwrapId,
   wrapId
 } from '../utils'
+import { getDepOptimizationConfig } from '../config'
 import type { ResolvedConfig } from '../config'
 import type { Plugin } from '../plugin'
 import {
@@ -712,7 +712,7 @@ export function importAnalysisPlugin(config: ResolvedConfig): Plugin {
       // These requests will also be registered in transformRequest to be awaited
       // by the deps optimizer
       if (config.server.preTransformRequests && staticImportedUrls.size) {
-        staticImportedUrls.forEach(({ url, id }) => {
+        staticImportedUrls.forEach(({ url }) => {
           url = removeImportQuery(url)
           transformRequest(url, server, { ssr }).catch((e) => {
             if (e?.code === ERR_OUTDATED_OPTIMIZED_DEP) {

packages/vite/src/node/server/middlewares/transform.ts

@@ -18,7 +18,7 @@ import {
   unwrapId
 } from '../../utils'
 import { send } from '../send'
-import { transformRequest } from '../transformRequest'
+import { ERR_LOAD_URL, transformRequest } from '../transformRequest'
 import { isHTMLProxy } from '../../plugins/html'
 import {
   DEP_VERSION_RE,
@@ -224,6 +224,10 @@ export function transformMiddleware(
         // error but a normal part of the missing deps discovery flow
         return
       }
+      if (e?.code === ERR_LOAD_URL) {
+        // Let other middleware handle if we can't load the url via transformRequest
+        return next()
+      }
       return next(e)
     }
 

packages/vite/src/node/server/transformRequest.ts

@@ -21,6 +21,9 @@ import { getDepsOptimizer } from '../optimizer'
 import { injectSourcesContent } from './sourcemap'
 import { isFileServingAllowed } from './middlewares/static'
 
+export const ERR_LOAD_URL = 'ERR_LOAD_URL'
+export const ERR_LOAD_PUBLIC_URL = 'ERR_LOAD_PUBLIC_URL'
+
 const debugLoad = createDebugger('vite:load')
 const debugTransform = createDebugger('vite:transform')
 const debugCache = createDebugger('vite:cache')
@@ -215,18 +218,18 @@ async function loadAndTransform(
     }
   }
   if (code == null) {
-    if (checkPublicFile(url, config)) {
-      throw new Error(
-        `Failed to load url ${url} (resolved id: ${id}). ` +
-          `This file is in /public and will be copied as-is during build without ` +
-          `going through the plugin transforms, and therefore should not be ` +
-          `imported from source code. It can only be referenced via HTML tags.`
-      )
-    } else {
-      return null
-    }
+    const isPublicFile = checkPublicFile(url, config)
+    const msg = isPublicFile
+      ? `This file is in /public and will be copied as-is during build without ` +
+        `going through the plugin transforms, and therefore should not be ` +
+        `imported from source code. It can only be referenced via HTML tags.`
+      : `Does the file exist?`
+    const err: any = new Error(
+      `Failed to load url ${url} (resolved id: ${id}). ${msg}`
+    )
+    err.code = isPublicFile ? ERR_LOAD_PUBLIC_URL : ERR_LOAD_URL
+    throw err
   }
-
   // ensure module in graph after successful load
   const mod = await moduleGraph.ensureEntryFromUrl(url, ssr)
   ensureWatchedFile(watcher, mod.file, root)

packages/vite/src/node/ssr/__tests__/fixtures/modules/has-invalid-import.js

@@ -0,0 +1,4 @@
+// eslint-disable-next-line node/no-missing-import
+import { foo } from './non-existent.js'
+
+export const hello = 'world'

packages/vite/src/node/ssr/__tests__/ssrLoadModule.spec.ts

@@ -0,0 +1,23 @@
+import { fileURLToPath } from 'node:url'
+import { expect, test } from 'vitest'
+import { createServer } from '../../server'
+
+const root = fileURLToPath(new URL('./', import.meta.url))
+
+async function createDevServer() {
+  const server = await createServer({ configFile: false, root })
+  server.pluginContainer.buildStart({})
+  return server
+}
+
+test('ssrLoad', async () => {
+  expect.assertions(1)
+  const server = await createDevServer()
+  try {
+    await server.ssrLoadModule('/fixtures/modules/has-invalid-import.js')
+  } catch (e) {
+    expect(e.message).toBe(
+      'Failed to load url ./non-existent.js (resolved id: ./non-existent.js). Does the file exist?'
+    )
+  }
+})