Some tips for using mkdist

I use unbuild + mkdist to build component libraries for Vue3, here are some tips for you.

1. Don't use format:cjs to build *.vue file
2. Issue occurred while building *.vue file with two <script> blocks
3. Split multiple entries based on file extension

Don't use format:cjs to build *.vue file

When use format:cjs to build *.vue file, the script block in *.vue will build to cjs too.

expo default defineBuildConfig({
  entries: [
    // When not specify loaders, resolve `['js', 'css', 'vue']`
    // https://github.com/unjs/mkdist/blob/67e4cd56bf857849a53d185229754c76a0ecaf58/src/loaders/index.ts#L24
    { builder: 'mkdist', input: './src', format: 'cjs' /* loaders: ['js', 'css', 'vue'] */ }
    //                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  ]
})

Issue occurred while building *.vue file with two <script> blocks

As the picture shows, mkdist change <script lang='ts'> to <script>, It will case a build error when use the dist in vitepress.

Split multiple entries based on file extension

So, the best practice is Split multiple entries based on file extension

export default defineBuildConfig({
  entries: [
    // *.css -> *.css
    { builder: 'mkdist', input: './src', pattern: ['**/*.css'], loaders: ['sass'] },

    // *.vue -> *.vue
    { builder: 'mkdist', input: './src',pattern: ['**/*.vue'], loaders: ['vue'] },

    // *.ts -> *.js & *.cjs
    // plz keep `esm` after `cjs`
    { builder: 'mkdist', input: './src', pattern: ['**/*.ts'], format: 'cjs', loaders: ['js'] },
    { builder: 'mkdist', input: './src', pattern: ['**/*.ts'], format: 'esm', loaders: ['js'] },
  ],
  clean: true,
  declaration: true,
  externals: ['vue']
})

source code of the demo