file.svelte.ts processed multiple times

[nosovk]

Describe the bug

We have specific configuration to use both webcomponents and normal svelte components at once.
This is done by this part of config: https://github.com/nosovk/svelte-web-components-template/blob/main/vite.demo.config.ts#L15-L24
It actually works, till we try to use runes in ts files (example).

import * as $ ... added by plugin, it's part of pre-compilation step, but somehow it triggers build error. I thing that it's because it's processed multiple times, but I can't find why (the file referenced only at once)

Corresponding issue in template repo: sinedied/svelte-web-components-template#11

Reproduction URL

https://github.com/nosovk/svelte-web-components-template

Reproduction

git clone https://github.com/nosovk/svelte-web-components-template
cd svelte-web-components-template
npm i
npm run dev

Logs

vite:resolve 1.45ms svelte/reactivity -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/svelte/src/reactivity/index-client.js +24ms
  vite:resolve 2.05ms esm-env -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/esm-env/index.js +3ms
  vite:resolve 0.84ms esm-env/browser -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/esm-env/true.js +6ms      
  vite:resolve 0.54ms esm-env/development -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/esm-env/true.js +3ms  
  vite:resolve 0.37ms esm-env/node -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/esm-env/false.js +1ms        
  vite:resolve 0.43ms svelte/internal/client -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/svelte/src/internal/client/index.js +3ms
  vite:deps ✨ static imports crawl ended +50ms
  vite:resolve 1.18ms clsx -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/clsx/dist/clsx.mjs +16ms
  vite:deps Dependencies bundled in 88.08ms +89ms
  vite:deps ✨ using post-scan optimizer result, the scanner found every used dependency +47ms
  vite:deps creating _metadata.json in C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/.vite/deps_temp_3737ce5c +2ms
  vite:deps renaming C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/.vite/deps_temp_3737ce5c to C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/.vite/deps +1ms
  vite:deps ✨ dependencies optimized +3ms

PS C:\Users\NosovK\WebstormProjects\cat\svelte-web-components-template> vite dev --debug > rep.txt
  vite:config config file loaded in 409.42ms +0ms
  vite:env loading env files: [
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.local',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.development',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.development.local'
  vite:env ] +0ms
  vite:env env files loaded in 0.80ms +0ms
  vite:env using resolved env: {} +1ms
  vite:env loading env files: [
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.local',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.development',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.development.local'
  vite:env ] +7ms
  vite:env env files loaded in 0.44ms +1ms
  vite:env using resolved env: {} +0ms
  vite:env loading env files: [
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.local',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.development',
  vite:env   'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib/.env.development.local'
  vite:env ] +1ms
  vite:env env files loaded in 0.43ms +0ms
  vite:env using resolved env: {} +1ms
  vite:config using resolved config: {
  vite:config   root: 'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/packages/lib',
  vite:config   build: {
  vite:config     target: [ 'es2020', 'edge88', 'firefox78', 'chrome87', 'safari14' ],
  vite:config     polyfillModulePreload: true,
  vite:config     modulePreload: { polyfill: true },
  vite:config     outDir: '../../dist/lib',
  vite:config     assetsDir: 'assets',
  vite:config     assetsInlineLimit: 4096,
  vite:config     sourcemap: false,
  vite:config     terserOptions: {},
  vite:config     rollupOptions: { output: {} },
  vite:config     commonjsOptions: { include: [ /node_modules/ ], extensions: [ '.js', '.cjs' ] },
  vite:config     dynamicImportVarsOptions: { warnOnError: true, exclude: [ /node_modules/ ] },
  vite:config     write: true,
  vite:config     emptyOutDir: true,
  vite:config     copyPublicDir: true,
  vite:config     manifest: false,
  vite:config     lib: {
  vite:config       entry: './index.ts',
  vite:config       formats: [ 'es', 'esm', 'umd' ],
  vite:config       name: 'myLibrary',
  vite:config       fileName: [Function: fileName]
  vite:config     },
  vite:config     ssrManifest: false,
  vite:config     ssrEmitAssets: false,
  vite:config     reportCompressedSize: true,
  vite:config     chunkSizeWarningLimit: 500,
  vite:config     watch: null,
  vite:config     cssCodeSplit: false,
  vite:config     minify: 'esbuild',
  vite:config     ssr: false,
  vite:config     emitAssets: false,
  vite:config     createEnvironment: [Function: createEnvironment],
  vite:config     cssTarget: [ 'es2020', 'edge88', 'firefox78', 'chrome87', 'safari14' ],
  vite:config     cssMinify: true
  vite:config   },
  vite:config   plugins: [
  vite:config     'vite:optimized-deps',
  vite:config     'vite:watch-package-data',
  vite:config     'vite:pre-alias',
  vite:config     'alias',
  vite:config     'vite-plugin-svelte',
  vite:config     'vite-plugin-svelte-inspector',
  vite:config     'vite-plugin-svelte',
  vite:config     'vite-plugin-svelte-inspector',
  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     'minifyEs',
  vite:config     'vite:wasm-fallback',
  vite:config     'vite:define',
  vite:config     'vite:css-post',
  vite:config     'vite:worker-import-meta-url',
  vite:config     'vite:asset-import-meta-url',
  vite:config     'vite:dynamic-import-vars',
  vite:config     'vite:import-glob',
  vite:config     'vite-plugin-svelte-module',
  vite:config     'vite-plugin-svelte-module',
  vite:config     'vite:client-inject',
  vite:config     'vite:css-analysis',
  vite:config     'vite:import-analysis'
  vite:config   ],
  vite:config   server: {
  vite:config     port: 5173,
  vite:config     strictPort: false,
  vite:config     host: undefined,
  vite:config     allowedHosts: [],
  vite:config     https: undefined,
  vite:config     open: false,
  vite:config     proxy: undefined,
  vite:config     cors: {
  vite:config       origin: /^https?:\/\/(?:(?:[^:]+\.)?localhost|127\.0\.0\.1|\[::1\])(?::\d+)?$/
  vite:config     },
  vite:config     headers: {},
  vite:config     warmup: { clientFiles: [], ssrFiles: [] },
  vite:config     middlewareMode: false,
  vite:config     fs: {
  vite:config       strict: true,
  vite:config       deny: [ '.env', '.env.*', '*.{crt,pem}', '**/.git/**' ],
  vite:config       allow: [
  vite:config         'C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template'
  vite:config       ]
  vite:config     },
  vite:config     preTransformRequests: true,
  vite:config     perEnvironmentStartEndDuringDev: false,
  vite:config     sourcemapIgnoreList: [Function: isInNodeModules$1]
  vite:config   },
  vite:config   resolve: {
  vite:config     externalConditions: [ 'node' ],
  vite:config     extensions: [
  vite:config       '.mjs',  '.js',
  vite:config       '.mts',  '.ts',
  vite:config       '.jsx',  '.tsx',
  vite:config       '.json'
  vite:config     ],
  vite:config     dedupe: [
  vite:config       'svelte',
  vite:config       'svelte/animate',
  vite:config       'svelte/easing',
  vite:config       'svelte/internal',
  vite:config       'svelte/internal/client',
  vite:config       'svelte/internal/disclose-version',
  vite:config       'svelte/internal/flags/legacy',
  vite:config       'svelte/internal/flags/tracing',
  vite:config       'svelte/internal/server',
  vite:config       'svelte/legacy',
  vite:config       'svelte/motion',
  vite:config       'svelte/reactivity',
  vite:config       'svelte/reactivity/window',
  vite:config       'svelte/server',
  vite:config       'svelte/store',
  vite:config       'svelte/transition',
  vite:config       'svelte/events',
  vite:config       'svelte',
  vite:config       'svelte/animate',
  vite:config       'svelte/easing',
  vite:config       'svelte/internal',
  vite:config       'svelte/internal/client',
  vite:config       'svelte/internal/disclose-version',
  vite:config       'svelte/internal/flags/legacy',
  vite:config       'svelte/internal/flags/tracing',
  vite:config       'svelte/internal/server',
  vite:config       'svelte/legacy',
  vite:config       'svelte/motion',
  vite:config       'svelte/reactivity',
  vite:config       'svelte/reactivity/window',
  vite:config       'svelte/server',
  vite:config       'svelte/store',
  vite:config       'svelte/transition',
  vite:config       'svelte/events'
  vite:config     ],
  vite:config     noExternal: [],
  vite:config     external: [],
  vite:config     preserveSymlinks: false,
  vite:config     alias: [
  vite:config       {
  vite:config         find: /^\/?@vite\/env/,
  vite:config         replacement: '/@fs/C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/vite/dist/client/env.mjs' 
  vite:config       },
  vite:config       {
  vite:config         find: /^\/?@vite\/client/,
  vite:config         replacement: '/@fs/C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/vite/dist/client/client.mjs'
  vite:config       }
  vite:config     ],
  vite:config     mainFields: [
  vite:config       'svelte',
  vite:config       'svelte',
  vite:config       'browser',
  vite:config       'module',
  vite:config       'jsnext:main',
  vite:config       'jsnext'
  vite:config     ],
  vite:config     conditions: [
  vite:config       'module',
  vite:config       'browser',
  vite:config       'development|production',
  vite:config       'svelte',
  vite:config       'svelte'
  vite:config     ],
  vite:config     builtins: []
  vite:config   },
  vite:config   optimizeDeps: {
  vite:config     include: [
  vite:config       'svelte',
  vite:config       'svelte/animate',
  vite:config       'svelte/easing',
  vite:config       'svelte/internal',
  vite:config       'svelte/internal/client',
  vite:config       'svelte/internal/disclose-version',
  vite:config       'svelte/internal/flags/legacy',
  vite:config       'svelte/internal/flags/tracing',
  vite:config       'svelte/legacy',
  vite:config       'svelte/motion',
  vite:config       'svelte/reactivity',
  vite:config       'svelte/reactivity/window',
  vite:config       'svelte/store',
  vite:config       'svelte/transition',
  vite:config       'svelte/events',
  vite:config       'svelte',
  vite:config       'svelte/animate',
  vite:config       'svelte/easing',
  vite:config       'svelte/internal',
  vite:config       'svelte/internal/client',
  vite:config       'svelte/internal/disclose-version',
  vite:config       'svelte/internal/flags/legacy',
  vite:config       'svelte/internal/flags/tracing',
  vite:config       'svelte/legacy',
  vite:config       'svelte/motion',
  vite:config       'svelte/reactivity',
  vite:config       'svelte/reactivity/window',
  vite:config       'svelte/store',
  vite:config       'svelte/transition',
  vite:config       'svelte/events'
  vite:config     ],
  vite:config     exclude: [],
  vite:config     needsInterop: [],
  vite:config     extensions: [ '.svelte', '.svelte' ],
  vite:config     disabled: undefined,
  vite:config     holdUntilCrawlEnd: true,
  vite:config     force: false,
  vite:config     noDiscovery: false,
  vite:config     esbuildOptions: {
  vite:config       preserveSymlinks: false,
  vite:config       plugins: [
  vite:config         {
  vite:config           name: 'vite-plugin-svelte:optimize-svelte',
  vite:config           setup: [Function: setup]
  vite:config         },
  vite:config         {
  vite:config           name: 'vite-plugin-svelte-module:optimize-svelte',
  vite:config           setup: [Function: setup]
  vite:config         },
  vite:config         {
  vite:config           name: 'vite-plugin-svelte:optimize-svelte',
  vite:config           setup: [Function: setup]
  vite:config         },
  vite:config         {
  vite:config           name: 'vite-plugin-svelte-module:optimize-svelte',
  vite:config           setup: [Function: setup]
  vite:config         }
  vite:config       ]
  vite:config     }
  vite:config   },
  vite:config   ssr: {
  vite:config     target: 'node',
  vite:config     optimizeDeps: {
  vite:config       esbuildOptions: { preserveSymlinks: false },
  vite:config       include: [],
  vite:config       exclude: [],
  vite:config       needsInterop: [],
  vite:config       extensions: [],
  vite:config       holdUntilCrawlEnd: true,
  vite:config       force: false,
  vite:config       noDiscovery: true
  vite:config     },
  vite:config     external: [],
  vite:config     noExternal: [
  vite:config       'svelte',
  vite:config       /^svelte\//,
  vite:config       'esm-env',
  vite:config       'svelte',
  vite:config       /^svelte\//,
  vite:config       'esm-env'
  vite:config     ],
  vite:config     resolve: {
  vite:config       conditions: [
  vite:config         'module',
  vite:config         'node',
  vite:config         'development|production',
  vite:config         'svelte',
  vite:config         'svelte'
  vite:config       ],
  vite:config       externalConditions: [ 'node' ]
  vite:config     }
  vite:config   },
  vite:config   experimental: { importGlobRestoreExtension: false, hmrPartialAccept: true },
  vite:config   environments: {
  vite:config     client: {
  vite:config       define: undefined,
  vite:config       resolve: {
  vite:config         externalConditions: [ 'node' ],
  vite:config         extensions: [
  vite:config           '.mjs',  '.js',
  vite:config           '.mts',  '.ts',
  vite:config           '.jsx',  '.tsx',
  vite:config           '.json'
  vite:config         ],
  vite:config         dedupe: [
  vite:config           'svelte',
  vite:config           'svelte/animate',
  vite:config           'svelte/easing',
  vite:config           'svelte/internal',
  vite:config           'svelte/internal/client',
  vite:config           'svelte/internal/disclose-version',
  vite:config           'svelte/internal/flags/legacy',
  vite:config           'svelte/internal/flags/tracing',
  vite:config           'svelte/internal/server',
  vite:config           'svelte/legacy',
  vite:config           'svelte/motion',
  vite:config           'svelte/reactivity',
  vite:config           'svelte/reactivity/window',
  vite:config           'svelte/server',
  vite:config           'svelte/store',
  vite:config           'svelte/transition',
  vite:config           'svelte/events',
  vite:config           'svelte',
  vite:config           'svelte/animate',
  vite:config           'svelte/easing',
  vite:config           'svelte/internal',
  vite:config           'svelte/internal/client',
  vite:config           'svelte/internal/disclose-version',
  vite:config           'svelte/internal/flags/legacy',
  vite:config           'svelte/internal/flags/tracing',
  vite:config           'svelte/internal/server',
  vite:config           'svelte/legacy',
  vite:config           'svelte/motion',
  vite:config           'svelte/reactivity',
  vite:config           'svelte/reactivity/window',
  vite:config           'svelte/server',
  vite:config           'svelte/store',
  vite:config           'svelte/transition',
  vite:config           'svelte/events'
  vite:config         ],
  vite:config         noExternal: [],
  vite:config         external: [],
  vite:config         preserveSymlinks: false,
  vite:config         alias: [
  vite:config           {
  vite:config             find: /^\/?@vite\/env/,
  vite:config             replacement: '/@fs/C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/vite/dist/client/env.mjs'
  vite:config           },
  vite:config           {
  vite:config             find: /^\/?@vite\/client/,
  vite:config             replacement: '/@fs/C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/vite/dist/client/client.mjs'
  vite:config           }
  vite:config         ],
  vite:config         mainFields: [
  vite:config           'svelte',
  vite:config           'svelte',
  vite:config           'browser',
  vite:config           'module',
  vite:config           'jsnext:main',
  vite:config           'jsnext'
  vite:config         ],
  vite:config         conditions: [
  vite:config           'module',
  vite:config           'browser',
  vite:config           'development|production',
  vite:config           'svelte',
  vite:config           'svelte'
  vite:config         ],
  vite:config         builtins: []
  vite:config       },
  vite:config       keepProcessEnv: false,
  vite:config       consumer: 'client',
  vite:config       optimizeDeps: {
  vite:config         include: [
  vite:config           'svelte',
  vite:config           'svelte/animate',
  vite:config           'svelte/easing',
  vite:config           'svelte/internal',
  vite:config           'svelte/internal/client',
  vite:config           'svelte/internal/disclose-version',
  vite:config           'svelte/internal/flags/legacy',
  vite:config           'svelte/internal/flags/tracing',
  vite:config           'svelte/legacy',
  vite:config           'svelte/motion',
  vite:config           'svelte/reactivity',
  vite:config           'svelte/reactivity/window',
  vite:config           'svelte/store',
  vite:config           'svelte/transition',
  vite:config           'svelte/events',
  vite:config           'svelte',
  vite:config           'svelte/animate',
  vite:config           'svelte/easing',
  vite:config           'svelte/internal',
  vite:config           'svelte/internal/client',
  vite:config           'svelte/internal/disclose-version',
  vite:config           'svelte/internal/flags/legacy',
  vite:config           'svelte/internal/flags/tracing',
  vite:config           'svelte/legacy',
  vite:config           'svelte/motion',
  vite:config           'svelte/reactivity',
  vite:config           'svelte/reactivity/window',
  vite:config           'svelte/store',
  vite:config           'svelte/transition',
  vite:config           'svelte/events'
  vite:config         ],
  vite:config         exclude: [],
  vite:config         needsInterop: [],
  vite:config         extensions: [ '.svelte', '.svelte' ],
  vite:config         disabled: undefined,
  vite:config         holdUntilCrawlEnd: true,
  vite:config         force: false,
  vite:config         noDiscovery: false,
  vite:config         esbuildOptions: {
  vite:config           preserveSymlinks: false,
  vite:config           plugins: [
  vite:config             {
  vite:config               name: 'vite-plugin-svelte:optimize-svelte',
  vite:config               setup: [Function: setup]
  vite:config             },
  vite:config             {
  vite:config               name: 'vite-plugin-svelte-module:optimize-svelte',
  vite:config               setup: [Function: setup]
  vite:config             },
  vite:config             {
  vite:config               name: 'vite-plugin-svelte:optimize-svelte',
  vite:config               setup: [Function: setup]
  vite:config             },
  vite:config             {
  vite:config               name: 'vite-plugin-svelte-module:optimize-svelte',
  vite:config               setup: [Function: setup]
  vite:config             }
  vite:config           ]
  vite:config         }
  vite:config       },
  vite:config       dev: {
  vite:config         warmup: [],
  vite:config         sourcemap: { js: true },
  vite:config         sourcemapIgnoreList: [Function: isInNodeModules$1],
  vite:config         preTransformRequests: true,
  vite:config         createEnvironment: [Function: defaultCreateClientDevEnvironment],
  vite:config         recoverable: true,
  vite:config         moduleRunnerTransform: false
  vite:config       },
  vite:config       build: {
  vite:config         target: [ 'es2020', 'edge88', 'firefox78', 'chrome87', 'safari14' ],
  vite:config         polyfillModulePreload: true,
  vite:config         modulePreload: { polyfill: true },
  vite:config         outDir: '../../dist/lib',
  vite:config         assetsDir: 'assets',
  vite:config         assetsInlineLimit: 4096,
  vite:config         sourcemap: false,
  vite:config         terserOptions: {},
  vite:config         rollupOptions: { output: {} },
  vite:config         commonjsOptions: { include: [ /node_modules/ ], extensions: [ '.js', '.cjs' ] },
  vite:config         dynamicImportVarsOptions: { warnOnError: true, exclude: [ /node_modules/ ] },
  vite:config         write: true,
  vite:config         emptyOutDir: true,
  vite:config         copyPublicDir: true,
  vite:config         manifest: false,
  vite:config         lib: {
  vite:config           entry: './index.ts',
  vite:config           formats: [ 'es', 'esm', 'umd' ],
  vite:config           name: 'myLibrary',
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  vite:deps (client) removing old cache dir C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/.vite/deps +0ms
  vite:resolve 1.90ms svelte -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/svelte/src/index-client.js +0ms    
  vite:resolve 0.61ms svelte/animate -> C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/svelte/src/animate/index.js
 +1ms
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  vite:deps scanning for dependencies... +0ms
  vite:deps Scan completed in 6.89ms: no dependencies found +0ms
  vite:deps creating package.json in C:/Users/NosovK/WebstormProjects/cat/svelte-web-components-template/node_modules/.vite/deps_temp_a4435b8b +30ms
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System Info

System:
    OS: Windows 11 10.0.26100
    CPU: (20) x64 13th Gen Intel(R) Core(TM) i7-1370P
    Memory: 36.79 GB / 63.67 GB
  Binaries:
    Node: 22.14.0 - ~\AppData\Local\fnm_multishells\25168_1746717524908\node.EXE
    npm: 10.9.2 - ~\AppData\Local\fnm_multishells\25168_1746717524908\npm.CMD
  Browsers:
    Edge: Chromium (129.0.2792.65)
  npmPackages:
    @sveltejs/vite-plugin-svelte: ^5.0.3 => 5.0.3
    svelte: ^5.28.2 => 5.28.2
    vite: ^6.3.5 => 6.3.5

[dominikg]

include and exclude for svelte.ts files are configured in vitePlugin.experimental.compileModule of svelte.config.js. If you add more than one plugin instance, you need to make them mutually exclusive there too

[dominikg]

id recommend running separate builds though to avoid other issues

[nosovk]

https://github.com/sveltejs/vite-plugin-svelte/blob/3589433cd19464c484f560516d41e670e5d40710/packages/vite-plugin-svelte/src/public.d.ts#L190-191

import { sveltePreprocess } from 'svelte-preprocess'

export default {
  preprocess: sveltePreprocess(),
  vitePlugin: {
    compileModule: {
      exclude: /\.wc\.svelte$/,
    }
  }
}

never heard about those params, will check now

[nosovk]

No luck, excluding didn't help, but anyway infixes option could be useful in many other cases, thanks

[dominikg]

you have to exclude .svelte. in one of them or maybe set infixes to ["doesnotexist"]

[dominikg]

also just realized you must configure them in vite config, as svelte config is read by both

[nosovk]

yep, I've tried with ["donottuchme"] :)

I'll look how to make this settings in vite config later today (there is no direct access to underlain config I think, thus probably will add some kind of global variable for passing settings to svelte config)

[nosovk]

it helped, thanks. I've updated repo with fix.

resulting vite config:

import { defineConfig } from "vite";
import { svelte } from "@sveltejs/vite-plugin-svelte";

export default defineConfig({
	root: "./packages/demo/",
	resolve: {
		dedupe: ["svelte"],
	},
	build: {
		outDir: "../../dist",
		emptyOutDir: true,
	},
	plugins: [
		svelte({
			exclude: /\.wc\.svelte$/ as any,
			hot: false,
		}),
		svelte({
			include: /\.wc\.svelte$/ as any,
			hot: false,
			compilerOptions: {
				customElement: true,
			},
			experimental: { // this is where is a trick!!!
				compileModule: {
					infixes: [".wcsvelte."],
				},
			},
		}),
	],
});