Fix missing setListener export in React core build

[Dan503]

Summary

• The framework-agnostic packages/core/src/framework/index.ts doesn't declare Listener or setListener, but index.react.ts does. The bundler's export * re-export forwards only names visible on the base module's analysis, so setListener was silently dropped from packages/core/dist/index.react.js.
• This broke @formisch/react's build — frameworks/react/src/hooks/useSignals/useSignals.ts imports setListener from @formisch/core/react and tsdown errors with "setListener" is not exported by "../../packages/core/dist/index.react.js".
• Adds Listener type and setListener stub to the base index.ts, matching the existing "No framework selected" stub pattern used for createId, createSignal, batch, and untrack. React picks up the real implementation from index.react.ts; the other five frameworks pick up the throwing stub but never call it.
• Patch-bumps the two affected packages: @formisch/core 0.6.3 → 0.6.4 and @formisch/react 0.4.5 → 0.4.6.

Audit

I checked every *.{framework}.ts file in packages/core/src/framework/, packages/core/src/types/, and packages/methods/src/ for the same bug pattern. Only React's Listener / setListener were missing from base — every other framework variant either redeclares the same names as its base or explicitly re-exports them (e.g. field.qwik.ts re-exports FieldElement, form.qwik.ts re-exports ValidationMode/SubmitHandler/SubmitEventHandler).

After the fix, all six framework cores' dist files have an identical 22-symbol export list, and pnpm -C frameworks/react build succeeds.

Note on the other 5 framework packages

I only bumped @formisch/react since it was the only framework with a broken build. The other five (preact, qwik, solid, svelte, vue) don't import setListener, so they're unaffected at the source level — but they will pick up the new setListener stub in their core dists when they next rebuild. If you'd prefer to also bump those five to follow the "bump-frameworks-with-deps" convention used in the v0.4.5 release, happy to add that as a follow-up commit.

Test plan

• pnpm -C packages/core build succeeds.
• pnpm -C packages/methods build succeeds.
• pnpm -C frameworks/react build succeeds (previously failed with MISSING_EXPORT setListener).
• pnpm -C frameworks/{preact,qwik,solid,svelte,vue} build all succeed (no regressions).
• Inspect packages/core/dist/index.{preact,qwik,react,solid,svelte,vue}.js — all six should list setListener in the final export { ... } line.
• pnpm -C playgrounds/react dev starts without Failed to resolve entry for package "@formisch/react".

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 10dc3d0 and 27e5fd3.

📒 Files selected for processing (5)

• frameworks/react/CHANGELOG.md
• frameworks/react/package.json
• packages/core/CHANGELOG.md
• packages/core/package.json
• packages/core/src/framework/index.ts

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Walkthrough

This pull request updates the package versions for both the React framework and core packages, bumping @formisch/react from 0.4.5 to 0.4.6 and @formisch/core from 0.6.3 to 0.6.4. Corresponding changelog entries document the release notes for each version. The core change adds two new exports to packages/core/src/framework/index.ts: a Listener type representing a listener callback and subscription-set structure, and a setListener function that follows the framework-selection pattern by throwing an exception when no framework is selected.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: adding a missing setListener export to fix the React core build failure.
Description check	✅ Passed	The description provides comprehensive context about the root cause, impact, fix, audit, and test plan—all directly related to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[cubic-dev-ai]

No issues found across 5 files

[Copilot]

Pull request overview

Fixes a missing export in the React-specific @formisch/core/react build by ensuring Listener and setListener are declared in the framework-agnostic framework entrypoint, preventing export * re-export analysis from dropping them and unblocking @formisch/react builds.

Changes:

• Add Listener type and setListener “No framework selected” stub to packages/core/src/framework/index.ts.
• Patch-bump @formisch/core and document the fix in its changelog.
• Patch-bump @formisch/react and document the core version update in its changelog.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/core/src/framework/index.ts	Declares Listener and setListener in the base framework module to ensure the React build re-exports them correctly.
packages/core/package.json	Bumps @formisch/core version to 0.6.4.
packages/core/CHANGELOG.md	Adds release note for v0.6.4 describing the missing export fix.
frameworks/react/package.json	Bumps @formisch/react version to 0.4.6.
frameworks/react/CHANGELOG.md	Adds release note for v0.4.6 referencing the core bump/fix.

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[fabian-hiller]

Thank you for looking into this. I need more details to understand where and how you encountered this issue. When I clone the repo, install the packages and build the library there are no errors and setListener is part of the /react/dist/index.js file.

[fabian-hiller]

Any updates?

[Dan503]

This PR is basically a precursor for the much larger PR: #87