Vite tasks and a monorepo in which some vite.config.ts files depend on the build output of other packages

[WoodyWoodsta]

We have a monorepo which contains application libraries, and applications themselves. The application vite.config.ts files depend on a helper library export which is only available after the dependant library has been built. However, running vp run -C path/to/library build still eagerly imports all vite.config.ts files in the repo, and therefore fails.

I could work around this by adding a custom pre-build script which run's the build commands directly on the library package, before being able to run vp commands, but this feels like a vite-plus anti-pattern (and it means I cannot use tasks at all for the pre-build).

What is the recommended way to solve this?

[Blizzeq]

On 1.0.0 you can keep vp run from executing the app configs by making their run field statically readable: the default export is a defineConfig(...) call from vite-plus, run is a plain literal after the last spread, and the app's build depends on the library build.

import { defineConfig } from 'vite-plus';
import { createAppConfig } from '@repro/helper';

export default defineConfig({
  ...createAppConfig(),
  run: {
    tasks: {
      build: {
        command: 'vp build',
        dependsOn: ['@repro/helper#build'],
      },
    },
  },
});

vp run loads the task graph for the whole workspace before it looks at the package you targeted, and Vite+ only executes a vite.config.ts when it can't read run from the source (handler.rs). A default export that is your own helper call, or a spread with no run after it, forces execution. I found this in the source, not in the docs, so I can't say whether it's the recommended way.

I tried it in a pnpm workspace. Before, vp -C packages/helper run build fails with Failed to load task config file for package at .../apps/web. With the config above the library builds, and vp -C apps/web run build builds the library first. The build script has to go from the app's package.json, a task can't be defined in both places. Also note -C goes before run: vp -C path run build.

[WoodyWoodsta]

Ah, that's awesome - thank you!