7.1.3 --> 8.0.0 regression: possibly pnpm related?

[zmullett]

I build using vite and pnpm. In 7.1.3 everything was WAI with no additional options specified.

With 8.0.0 my builds are broken and the source map includes entries such as:

../lib/some_usual_and_expected_file.ts
../node_modules/.pnpm/@[email protected]/node_modules/@lit/reactive-element/css-tag.js
../node_modules/.pnpm/[email protected]/node_modules/lodash-es/_root.js

Has something regressed in terms of pnpm support?

[Septh]

Has something regressed in terms of pnpm support?

Nothing that I am aware of.

Is your build still ok with 7.1.3?

[zmullett]

Yes, the build still works at 7.1.3.

[Septh]

Was afraid you would say that :)

Could you please provide a repro so I can investigate?

[zmullett]

Finally got back to this 😅

Steps to reproduce:

1. Clone https://github.com/zmullett/rollup-plugin-node-externals-v8-repro.
2. Ensure you have pnpm installed.
3. Run pnpm i - observe that rollup-plugin-node-externals@7 is used.
4. Run pnpm build - first observe that the generated file dist/rollup-plugin-node-externals-v8-repro.mjs has only an import statement - this is the expected behavior.
5. Run pnpm i rollup-plugin-node-externals@8 to upgrade.
6. Run pnpm build again - now observe that the generated file dist/rollup-plugin-node-externals-v8-repro.mjs includes the module that should only have been imported as earlier - this is the bug.

[Septh]

Thank you for the repro.

From what I see, this is not an issue with pnpm but with Vite.

If you move the plugin from build.rollupOptions.plugins to the top-level plugins array in vite.config.js:

export default defineConfig({
  build: {
    lib: {
      entry: resolve('index.js'),
      formats: ['es'],
    },
    rollupOptions: {
      plugins: [
        // nodeExternals() // <-- move from here...
      ],
    },
  },
  plugins: [
    nodeExternals()        // <-- to here
  ]
})

then the build works as expected.

I am not sure why but clearly, Vite treats Rollup plugins a little differently.

7.1.3 did work because the resolveId hook had a order: 'pre' property; however, it caused other problems and was removed in 8.0.0 (see #33).

Right now, I don't know what I can do about this. I think the simple workaround is to either use the top-level plugins array as shown above, or stick to 7.1.3 if it works for you. 🤷‍♂️ I'm going to stress that point in the docs.

[zmullett]

Confirmed, that works. Thanks for debugging and finding that difference between the plugins lists, ugh! I'll leave the ticket open in case you want to track that docs update with it.

[Septh]

FWIW, I found this in Vite documentation:

If a Rollup plugin only makes sense for the build phase, then it can be specified under build.rollupOptions.plugins instead. It will work the same as a Vite plugin with enforce: 'post' and apply: 'build'.

8.0.1 is out with an updated README, now closing this issue. Thanks again!