v-slot syntax not working with pug

[Shinigami92]

• Read the docs.
• 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/vue-next instead.
• This is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.

Describe the bug

v-slot syntax is not working in combination with pug

Reproduction

https://github.com/Shinigami92/vite-pug-error-repro

System Info

• vite version: 2.0.5
• Operating System: arch linux
• Node version: 15
• Package manager (npm/yarn/pnpm) and version: yarn 1

Logs (Optional if provided reproduction)

1. Run vite or vite build with the --debug flag.
2. Provide the error log here.

 ~/OpenSource/vite-pug-error-repro  main  yarn build --debug                                                                                       ✔  18:01:47 
yarn run v1.22.10
$ vite build --debug
  vite:config bundled config file loaded in 189ms +0ms
  vite:config using resolved config: {
  vite:config   plugins: [
  vite:config     'alias',
  vite:config     'vite:dynamic-import-polyfill',
  vite:config     'vite:resolve',
  vite:config     'vite:html',
  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-plugin-vue2',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:build-html',
  vite:config     'commonjs',
  vite:config     'vite:data-uri',
  vite:config     'rollup-plugin-dynamic-import-variables',
  vite:config     'vite:import-analysis',
  vite:config     'vite:esbuild-transpile',
  vite:config     'vite:terser',
  vite:config     'vite:reporter'
  vite:config   ],
  vite:config   resolve: { dedupe: undefined, alias: [ [Object], [Object] ] },
  vite:config   build: {
  vite:config     target: [ 'es2019', 'edge16', 'firefox60', 'chrome61', 'safari11' ],
  vite:config     polyfillDynamicImport: true,
  vite:config     outDir: 'dist',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     cssCodeSplit: true,
  vite:config     sourcemap: false,
  vite:config     rollupOptions: {},
  vite:config     commonjsOptions: { include: [Array], extensions: [Array] },
  vite:config     minify: 'terser',
  vite:config     terserOptions: {},
  vite:config     cleanCssOptions: {},
  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     brotliSize: true,
  vite:config     chunkSizeWarningLimit: 500
  vite:config   },
  vite:config   configFile: '/home/shinigami/OpenSource/vite-pug-error-repro/vite.config.ts',
  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: '/home/shinigami/OpenSource/vite-pug-error-repro',
  vite:config   base: '/',
  vite:config   publicDir: '/home/shinigami/OpenSource/vite-pug-error-repro/public',
  vite:config   command: 'build',
  vite:config   mode: 'production',
  vite:config   isProduction: true,
  vite:config   optimizeCacheDir: '/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/.vite',
  vite:config   server: {},
  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     error: [Function: error],
  vite:config     clearScreen: [Function: clearScreen]
  vite:config   },
  vite:config   createResolver: [Function: createResolver]
  vite:config } +3ms
vite v2.0.5 building for production...
✓ 5 modules transformed.
[vite-plugin-vue2] Unexpected token (1:247)
file: /home/shinigami/OpenSource/vite-pug-error-repro/src/App.pug?vue&type=template&src&lang.js:1:247
error during build:
SyntaxError: Unexpected token (1:247)
    at Parser.pp$4.raise (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:2757:13)
    at Parser.pp.unexpected (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:647:8)
    at Parser.pp.expect (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:641:26)
    at Parser.pp$2.parseBindingList (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:1694:19)
    at Parser.pp$1.parseFunctionParams (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:1231:22)
    at Parser.pp$1.parseFunction (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:1218:8)
    at Parser.pp$3.parseExprAtom (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:2184:17)
    at Parser.<anonymous> (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:6003:24)
    at Parser.parseExprAtom (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:6129:31)
    at Parser.pp$3.parseExprSubscripts (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:2047:19)
    at Parser.pp$3.parseMaybeUnary (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:2024:17)
    at Parser.pp$3.parseExprOps (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:1966:19)
    at Parser.pp$3.parseMaybeConditional (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:1949:19)
    at Parser.pp$3.parseMaybeAssign (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:1925:19)
    at Parser.pp$3.parsePropertyValue (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:2443:87)
    at Parser.pp$3.parseProperty (/home/shinigami/OpenSource/vite-pug-error-repro/node_modules/vue-template-es2015-compiler/buble.js:2434:8)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[Deckluhm]

Note that this is working fine in a Vue 3 project generated with Vite create-app so it's probably a problem specific to Vue 2 template.

[Shinigami92]

Note that this is working fine in a Vue 3 project generated with Vite create-app so it's probably a problem specific to Vue 2 template.

So you mean it could be a bug from vite-plugin-vue2?
Do you have a repro vue 3 + vite + pug using v-slot that you can link here?
Otherwise I could try setup a repro tomorrow.

[Deckluhm]

So you mean it could be a bug from vite-plugin-vue2?

Yes, probably (since this is the only thing different between your setup and mine).

Do you have a repro vue 3 + vite + pug using v-slot that you can link here?

I don't have a small enough repro to share right now, sorry.

[Shinigami92]

@underfin I can confirm vite-plugin-vue2 v1.4 now works 🎉 👍