Vite Plugin Svelte Yarn 2 Config File Bug

joelmukuthu

Reproduction for issue https://github.com/sveltejs/vite-plugin-svelte/issues/73

To reproduce:

Clone this repo and cd into the directory
Run yarn build
Observe that the build runs successfully. However, note that svelte.config.js is set to throw an error as soon as it's imported (via require or import). Compare with yarn expected which fails with the error as expected.

Debug logs produced with DEBUG=vite:vite-plugin-svelte yarn build:

   vite:vite-plugin-svelte additional vite config {
  optimizeDeps: {
    exclude: [
      'svelte/animate',
      'svelte/easing',
      'svelte/internal',
      'svelte/motion',
      'svelte/store',
      'svelte/transition',
      'svelte',
      'svelte-hmr/runtime/hot-api-esm.js',
      'svelte-hmr/runtime/proxy-adapter-dom.js',
      'svelte-hmr'
    ]
  },
  resolve: {
    mainFields: [ 'svelte', 'module', 'jsnext:main', 'jsnext' ],
    dedupe: [
      'svelte/animate',
      'svelte/easing',
      'svelte/internal',
      'svelte/motion',
      'svelte/store',
      'svelte/transition',
      'svelte',
      'svelte-hmr/runtime/hot-api-esm.js',
      'svelte-hmr/runtime/proxy-adapter-dom.js',
      'svelte-hmr'
    ]
  }
} +0ms
  vite:vite-plugin-svelte default options for production  {
  extensions: [ '.svelte' ],
  hot: false,
  emitCss: true,
  compilerOptions: { format: 'esm', css: false, dev: false, hydratable: true }
} +8ms
  vite:vite-plugin-svelte resolved options {
  extensions: [ '.svelte' ],
  hot: false,
  emitCss: true,
  compilerOptions: { format: 'esm', css: false, dev: false, hydratable: true },
  configFile: 'vite-plugin-svelte-yarn-2-config-file-bug/svelte.config.js',
  root: 'vite-plugin-svelte-yarn-2-config-file-bug/app',
  isProduction: true,
  isBuild: true,
  isServe: false
} +22ms
vite v2.3.8 building for production...
  vite:vite-plugin-svelte resolveId vite-plugin-svelte-yarn-2-config-file-bug/app/index.html +35ms
✓ 1 modules transformed.
Generated an empty chunk: "index"
rendering chunks (1)...  vite:vite-plugin-svelte transformIndexHtml <script type="module" crossorigin src="/assets/index.935273ac.js"></script>
<!DOCTYPE html>
<html>
  <body>
    foo
  </body>
</html>
 +190ms
dist/index.html                 0.13kb
dist/assets/index.935273ac.js   0.00kb / brotli: 0.00kb

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