[Vue3] build + watch + sourcemap cause rollup conflicting error

[Chen-jj]

Describe the bug

1. Enable sourcemap support in Vite config:

build: {
  sourcemap: true,
}

2. Run build command in watch mode: vite build --watch
3. Change any contents in <template> of App.vue
4. Got Rollup Error: Multiple conflicting contents for sourcemap source /home/projects/vitejs-vite-4gfbyh/src/App.vue

Every build when rollup calls addModuleSource method to process modules, it will figure out should use cache or not:

https://github.com/rollup/rollup/blob/27c0557f904321d649c9bd85f6fb670ca5700427/src/ModuleLoader.ts#L271-L275

During the second build which caused by the change of vue <template>, module /some_paths/index.vue?vue&type=script&lang.ts comes in addModuleSource method.But cachedModule.originalCode === sourceDescription.code is true this time, so rollup uses the cached version of this vue script module.

Finally, sourcemap source of module /some_paths/index.vue?vue&type=script&lang.ts is old template + old script, while sourcemap source of module /some_paths/index.vue is new template + old script.Becasue they all have the same source
filename but having different source contents, thus the error comes from traceMappings method of rollup:

https://github.com/rollup/rollup/blob/69ff4181e701a0fe0026d0ba147f31bc86beffa8/src/utils/collapseSourcemaps.ts#L87-L89

Reproduction

https://stackblitz.com/edit/vitejs-vite-4gfbyh?file=vite.config.js

System Info

System:
    OS: Linux 5.0 undefined
    CPU: (4) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh

Binaries:
    Node: 16.14.2 - /usr/local/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 7.17.0 - /usr/local/bin/npm

npmPackages:
    @vitejs/plugin-vue: ^3.1.0 => 3.1.0 
    vite: ^3.1.3 => 3.1.3

Used Package Manager

pnpm

Logs

Click to expand!

~/projects/vitejs-vite-4gfbyh 40s
❯ npm run build:watch
$ vite build --watch --debug
  vite:config bundled config file loaded in 1193.20ms +0ms
  vite:esbuild init tsconfck (root: /home/projects/vitejs-vite-4gfbyh) +0ms
  vite:esbuild init tsconfck (root: /home/projects/vitejs-vite-4gfbyh) +1ms
  vite:esbuild init tsconfck (root: /home/projects/vitejs-vite-4gfbyh) +1ms
  vite:esbuild init tsconfck (root: /home/projects/vitejs-vite-4gfbyh) +0ms
  vite:esbuild init tsconfck end +2ms
  vite:esbuild init tsconfck end +0ms
  vite:esbuild init tsconfck end +0ms
  vite:esbuild init tsconfck end +0ms
  vite:config using resolved config: {
  vite:config   plugins: [
  vite:config     'vite:ensure-watch',
  vite:config     'vite:build-metadata',
  vite:config     'vite:pre-alias',
  vite:config     'alias',
  vite:config     'vite:modulepreload-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html-inline-proxy',
  vite:config     'vite:css',
  vite:config     'vite:esbuild',
  vite:config     'vite:json',
  vite:config     'vite:wasm-helper',
  vite:config     'vite:worker',
  vite:config     'vite:asset',
  vite:config     'vite:vue',
  vite:config     'vite:wasm-fallback',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:build-html',
  vite:config     'vite:worker-import-meta-url',
  vite:config     'vite:force-systemjs-wrap-complete',
  vite:config     'vite:ensure-watch',
  vite:config     'vite:watch-package-data',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'vite:asset-import-meta-url',
  vite:config     'vite:dynamic-import-vars',
  vite:config     'vite:import-glob',
  vite:config     'vite:build-import-analysis',
  vite:config     'vite:esbuild-transpile',
  vite:config     'vite:terser',
  vite:config     'vite:reporter',
  vite:config     'vite:load-fallback'
  vite:config   ],
  vite:config   build: {
  vite:config     target: [ 'es2020', 'edge88', 'firefox78', 'chrome87', 'safari13' ],
  vite:config     polyfillModulePreload: true,
  vite:config     outDir: 'dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     cssTarget: [ 'es2020', 'edge88', 'firefox78', 'chrome87', 'safari13' ],
  vite:config     sourcemap: true,
  vite:config     rollupOptions: {},
  vite:config     minify: 'esbuild',
  vite:config     terserOptions: {},
  vite:config     write: true,
  vite:config     emptyOutDir: null,
  vite:config     manifest: false,
  vite:config     lib: false,
  vite:config     ssr: false,
  vite:config     ssrManifest: false,
  vite:config     reportCompressedSize: true,
  vite:config     chunkSizeWarningLimit: 500,
  vite:config     watch: true,
  vite:config     w: true,
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     dynamicImportVarsOptions: { warnOnError: true, exclude: [Array] }
  vite:config   },
  vite:config   optimizeDeps: {
  vite:config     disabled: 'build',
  vite:config     force: undefined,
  vite:config     esbuildOptions: { preserveSymlinks: undefined }
  vite:config   },
  vite:config   define: { __VUE_OPTIONS_API__: true, __VUE_PROD_DEVTOOLS__: false },
  vite:config   ssr: {
  vite:config     format: 'esm',
  vite:config     target: 'node',
  vite:config     external: [],
  vite:config     optimizeDeps: { disabled: true, esbuildOptions: [Object] }
  vite:config   },
  vite:config   configFile: '/home/projects/vitejs-vite-4gfbyh/vite.config.js',
  vite:config   configFileDependencies: [ '/home/projects/vitejs-vite-4gfbyh/vite.config.js' ],
  vite:config   inlineConfig: {
  vite:config     root: undefined,
  vite:config     base: undefined,
  vite:config     mode: undefined,
  vite:config     configFile: undefined,
  vite:config     logLevel: undefined,
  vite:config     clearScreen: undefined,
  vite:config     optimizeDeps: { force: undefined },
  vite:config     build: { watch: true, w: true }
  vite:config   },
  vite:config   root: '/home/projects/vitejs-vite-4gfbyh',
  vite:config   base: '/',
  vite:config   resolve: { alias: [ [Object], [Object] ] },
  vite:config   publicDir: '/home/projects/vitejs-vite-4gfbyh/public',
  vite:config   cacheDir: '/home/projects/vitejs-vite-4gfbyh/node_modules/.vite',
  vite:config   command: 'build',
  vite:config   mode: 'production',
  vite:config   isWorker: false,
  vite:config   mainConfig: null,
  vite:config   isProduction: true,
  vite:config   server: {
  vite:config     preTransformRequests: true,
  vite:config     middlewareMode: false,
  vite:config     fs: { strict: true, allow: [Array], deny: [Array] }
  vite:config   },
  vite:config   preview: {
  vite:config     port: undefined,
  vite:config     strictPort: undefined,
  vite:config     host: undefined,
  vite:config     https: undefined,
  vite:config     open: undefined,
  vite:config     proxy: undefined,
  vite:config     cors: undefined,
  vite:config     headers: undefined
  vite:config   },
  vite:config   env: { BASE_URL: '/', MODE: 'production', DEV: false, PROD: true },
  vite:config   assetsInclude: [Function: assetsInclude],
  vite:config   logger: {
  vite:config     hasWarned: false,
  vite:config     info: [Function: info],
  vite:config     warn: [Function: warn],
  vite:config     warnOnce: [Function: warnOnce],
  vite:config     error: [Function: error],
  vite:config     clearScreen: [Function: clearScreen],
  vite:config     hasErrorLogged: [Function: hasErrorLogged]
  vite:config   },
  vite:config   packageCache: Map(0) { set: [Function (anonymous)] },
  vite:config   createResolver: [Function: createResolver],
  vite:config   worker: {
  vite:config     format: 'iife',
  vite:config     plugins: [
  vite:config       'vite:ensure-watch',
  vite:config       'vite:build-metadata',
  vite:config       'vite:pre-alias',
  vite:config       'alias',
  vite:config       'vite:modulepreload-polyfill',
  vite:config       'vite:resolve',
  vite:config       'vite:html-inline-proxy',
  vite:config       'vite:css',
  vite:config       'vite:esbuild',
  vite:config       'vite:json',
  vite:config       'vite:wasm-helper',
  vite:config       'vite:worker',
  vite:config       'vite:asset',
  vite:config       'vite:wasm-fallback',
  vite:config       'vite:define',
  vite:config       'vite:css-post',
  vite:config       'vite:build-html',
  vite:config       'vite:worker-import-meta-url',
  vite:config       'vite:force-systemjs-wrap-complete',
  vite:config       'vite:ensure-watch',
  vite:config       'vite:watch-package-data',
  vite:config       'commonjs',
  vite:config       'vite:data-uri',
  vite:config       'vite:asset-import-meta-url',
  vite:config       'vite:dynamic-import-vars',
  vite:config       'vite:import-glob',
  vite:config       'vite:build-import-analysis',
  vite:config       'vite:esbuild-transpile',
  vite:config       'vite:terser',
  vite:config       'vite:reporter',
  vite:config       'vite:load-fallback'
  vite:config     ],
  vite:config     rollupOptions: {},
  vite:config     getSortedPlugins: [Function: getSortedPlugins],
  vite:config     getSortedPluginHooks: [Function: getSortedPluginHooks]
  vite:config   },
  vite:config   appType: 'spa',
  vite:config   experimental: { importGlobRestoreExtension: false, hmrPartialAccept: false },
  vite:config   getSortedPlugins: [Function: getSortedPlugins],
  vite:config   getSortedPluginHooks: [Function: getSortedPluginHooks]
  vite:config } +10ms
vite v3.1.3 building for production...

watching for file changes...

build started...
✓ 12 modules transformed.
dist/index.html                  0.44 KiB
dist/assets/index.c16bd851.css   1.01 KiB / gzip: 0.54 KiB
dist/assets/index.6b8e1b06.js    51.67 KiB / gzip: 20.79 KiB
dist/assets/index.6b8e1b06.js.map 570.62 KiB
built in 1538ms.

build started...
✓ 13 modules transformed.
rendering chunks (1)...Multiple conflicting contents for sourcemap source /home/projects/vitejs-vite-4gfbyh/src/App.vue

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[obrejla]

Same here :(

[marfous]

Facing the same issue as described in the report.

[i-platonov]

@Chen-jj I found a workaround for this - just use <script setup> notation of the component - it should work

[MarcelGeo]

Same issue :( watching with sourcemap is not possible currently with vite (?)

[MarcelGeo]

Maybe in vite 5 will be fix for this. I

[voodoobat]

Same problem (

[stephenhebert]

I don't know if it's related, but there are similar errors even when not in watch mode in certain cases -- specifically for mac and linux platforms.

nuxt/nuxt#14981
unocss/unocss#3224
intlify/bundle-tools#107