fix(vite-node): check more precisely for root/base paths (#4049)

Author: danielroe

packages/vite-node/src/server.ts

@@ -6,7 +6,7 @@ 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 { normalizeModuleId, toArray, toFilePath, withTrailingSlash } from './utils'
 import { Debugger } from './debug'
 import { withInlineSourcemap } from './source-map'
 
@@ -106,7 +106,7 @@ export class ViteNodeServer {
   }
 
   async resolveId(id: string, importer?: string, transformMode?: 'web' | 'ssr'): Promise<ViteNodeResolveId | null> {
-    if (importer && !importer.startsWith(this.server.config.root))
+    if (importer && !importer.startsWith(withTrailingSlash(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' })
@@ -182,7 +182,7 @@ export class ViteNodeServer {
     const cacheDir = this.options.deps?.cacheDir
 
     if (cacheDir && id.includes(cacheDir)) {
-      if (!id.startsWith(this.server.config.root))
+      if (!id.startsWith(withTrailingSlash(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.`)

packages/vite-node/src/source-map.ts

@@ -1,6 +1,7 @@
 import type { TransformResult } from 'vite'
 import { dirname, isAbsolute, relative, resolve } from 'pathe'
 import type { EncodedSourceMap } from '@jridgewell/trace-mapping'
+import { withTrailingSlash } from './utils'
 import { install } from './source-map-handler'
 
 interface InstallSourceMapSupportOptions {
@@ -32,7 +33,7 @@ export function withInlineSourcemap(result: TransformResult, options: {
     // this is a bug in Vite
     // all files should be either absolute to the file system or relative to the source map file
     if (isAbsolute(source)) {
-      const actualPath = (!source.startsWith(options.root) && source.startsWith('/'))
+      const actualPath = (!source.startsWith(withTrailingSlash(options.root)) && source.startsWith('/'))
         ? resolve(options.root, source.slice(1))
         : source
       return relative(dirname(options.filepath), actualPath)

packages/vite-node/src/utils.ts

@@ -22,7 +22,7 @@ export function slash(str: string) {
 export const VALID_ID_PREFIX = '/@id/'
 
 export function normalizeRequestId(id: string, base?: string): string {
-  if (base && id.startsWith(base))
+  if (base && id.startsWith(withTrailingSlash(base)))
     id = `/${id.slice(base.length)}`
 
   // keep drive the same as in process cwd
@@ -105,12 +105,12 @@ export function toFilePath(id: string, root: string): { path: string; exists: bo
     if (id.startsWith('/@fs/'))
       return { absolute: id.slice(4), exists: true }
     // check if /src/module.js -> <root>/src/module.js
-    if (!id.startsWith(root) && id.startsWith('/')) {
+    if (!id.startsWith(withTrailingSlash(root)) && id.startsWith('/')) {
       const resolved = resolve(root, id.slice(1))
       if (existsSync(cleanUrl(resolved)))
         return { absolute: resolved, exists: true }
     }
-    else if (id.startsWith(root) && existsSync(cleanUrl(id))) {
+    else if (id.startsWith(withTrailingSlash(root)) && existsSync(cleanUrl(id))) {
       return { absolute: id, exists: true }
     }
     return { absolute: id, exists: false }
@@ -200,6 +200,13 @@ function traverseBetweenDirs(
   }
 }
 
+export function withTrailingSlash(path: string): string {
+  if (path[path.length - 1] !== '/')
+    return `${path}/`
+
+  return path
+}
+
 export function createImportMetaEnvProxy() {
   // packages/vitest/src/node/plugins/index.ts:146
   const booleanKeys = [