Layouts plugin misresolves compound tags like <Toast.Provider>

[pathscale]

Splitting this out of pathscale/ui#280, where it was found.

What happens

<Toast.Provider /> compiles to a reference to the wrong export when the layouts application plugin is enabled.

With pluginSolid2LayoutsApplication enabled, the emitted call is:

createComponent(UI_MODULE.toast.Provider, { placement: "top-end" })

toast lowercase, the toast function, which has no .Provider. The page throws Comp is not a function at first render.

With the plugin disabled, the same source compiles correctly:

createComponent(UI_MODULE["default"].Provider, { placement: "top-end" })

which reaches the compound.

Why it is not the export collapse

pathscale/ui#280 fixes a separate packaging defect where Toast and toast were aliased onto one binding in the built entry. This reproduces after that fix, against a build where Toast and toast are verified as distinct exports and Toast resolves to Object.assign(ToastRoot, { Provider, ... }).

The plugin rewrites the import specifier from the bare @pathscale/ui to the resolved absolute path of the package entry, which changes how the bundler follows the re-export chain. That is where the two runs diverge.

Repro

• application: honey.id at chore/ui-2.11.9
• <Toast.Provider placement="top-end" /> in src/layouts/RootLayout.tsx
• toggle pluginSolid2LayoutsApplication({ layouts: ["@pathscale/ui"] }) in rsbuild.config.ts and compare the emitted reference in the served bundle

Both Toast and ToastProvider are present in layouts.manifest.json as {"kind":"embedded"}, so the plugin has what it needs to resolve either form.

Workaround

Use the flat ToastProvider export, which is what this repository's own docs/component-migration-map.md already recommends ("the new Toast system (Toast/ToastProvider/ToastQueue)"). That works today.

Worth checking

Whether other compound members of an embedded Layout resolve correctly through the plugin, or whether Toast is only conspicuous because the package also exports a lowercase toast. In the application checked, Toast.Provider was the only dotted reference that survived into the output at all; every other compound tag was rewritten to a flat Layout reference as expected.