@vitejs/plugin-vue Inconsistent component processing behavior between dev and build mode

[machao7]

Describe the bug

the reference of default export in sfc missing render in build mode.

Reproduction

https://github.com/machao7/vite-vue-plugin

System Info

System:
    OS: Windows 10 10.0.22000
    CPU: (8) x64 Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
    Memory: 17.71 GB / 31.79 GB
  Binaries:
    Node: 16.14.0 - C:\Program Files\nodejs\node.EXE
    npm: 6.14.15 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 100.0.4896.127
    Edge: Spartan (44.22000.120.0), Chromium (100.0.1185.44)
    Internet Explorer: 11.0.22000.120
  npmPackages:
    @vitejs/plugin-vue: ^2.3.1 => 2.3.1 
    vite: ^2.9.5 => 2.9.5

Used Package Manager

npm

Logs

vite:config bundled config file loaded in 41.01ms +0ms
  vite:config using resolved config: {
  vite:config   base: './',
  vite:config   build: {
  vite:config     target: [ 'es2019', 'edge88', 'firefox78', 'chrome87', 'safari13.1' ],
  vite:config     polyfillModulePreload: true,
  vite:config     outDir: './dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     cssTarget: [ 'es2019', 'edge88', 'firefox78', 'chrome87', 'safari13.1' ],
  vite:config     sourcemap: false,
  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: null,
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     dynamicImportVarsOptions: { warnOnError: true, exclude: [Array] }
  vite:config   },
  vite:config   plugins: [
  vite:config     'vite:build-metadata',
  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',
  vite:config     'vite:worker',
  vite:config     'vite:asset',
  vite:config     'vite:vue',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:build-html',
  vite:config     'vite:worker-import-meta-url',
  vite:config     'vite:watch-package-data',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'rollup-plugin-dynamic-import-variables',
  vite:config     'vite:asset-import-meta-url',
  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   define: { __VUE_OPTIONS_API__: true, __VUE_PROD_DEVTOOLS__: false },
  vite:config   ssr: { external: [ 'vue', '@vue/server-renderer' ] },
  vite:config   configFile: 'D:/code/vite-vue-plugin/vite.config.js',
  vite:config   configFileDependencies: [ 'D:/code/vite-vue-plugin/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     build: {}
  vite:config   },
  vite:config   root: 'D:/code/vite-vue-plugin',
  vite:config   resolve: { dedupe: undefined, alias: [ [Object], [Object] ] },
  vite:config   publicDir: 'D:\\code\\vite-vue-plugin\\public',
  vite:config   cacheDir: 'D:\\code\\vite-vue-plugin\\node_modules\\.vite',
  vite:config   command: 'build',
  vite:config   mode: 'production',
  vite:config   isWorker: false,
  vite:config   isProduction: true,
  vite:config   server: {
  vite:config     preTransformRequests: true,
  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       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object], [Object], [Object],
  vite:config       [Object]
  vite:config     ],
  vite:config     rollupOptions: {}
  vite:config   }
  vite:config } +9ms
vite v2.9.5 building for production...
✓ 11 modules transformed.
dist/index.html                 0.34 KiB
dist/assets/index.71f51778.js   51.04 KiB / gzip: 20.61 KiB

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guidelines.
• [X] Read the docs.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [X] 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 https://github.com/vuejs/core instead.
• [X] Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• [X] The provided reproduction is a minimal reproducible example of the bug.

[sapphi-red]

I think this is intended. (Introduced in https://github.com/vitejs/vite/commit/316d7afc0c84e51359938a12ebe1b09ca34ea8bd) Why do you need access to render function?

Related: https://github.com/vuejs/vue-loader/commit/11e3cb8a8a4a4e0aedc2978ce6d7e549a61de3d7

[machao7]

i want create alone app in some popup dialog without any dialog's ctx. in this way, app without render function can't render in dialog.

[machao7]

i found a solution like this:

// com.vue
export default {
 ...
}
import myself from "./com.vue";
export const openComponentInDialog = function() {
    openInDialog(myself)
}

[machao7]

the point of this issue is inconsistent behavior between dev and build mode

[sapphi-red]

I looked a bit more closely. rollup repl

The inconsistent behavior comes from /*#__PURE__*/ and tree-shaking. During dev tree-shaking does not happen. Here plugin-vue (and also vue-loader for reference) assumes a component to be used only from default export. Now I am not sure if it is intended to assume like that.