expose TS definitions

[iamdey]

The type definitions exposition have not been included during TS migration. This produces defintions at build time the same way as other final-form libs especially react-final-form-arrays.

Currently the only TS type available is @types/final-form-focus which is not compatible anymore with latest releases of final-form:

> npx tsc -p ./tsconfig.json --noEmit

node_modules/@types/final-form-focus/index.d.ts:16:26 - error TS2344: Type 'InitialFormValues' does not satisfy the constraint 'Partial<FormValues>'.

16 ): Decorator<FormValues, InitialFormValues>;
                            ~~~~~~~~~~~~~~~~~

  node_modules/@types/final-form-focus/index.d.ts:13:62
    13 export default function createDecorator<FormValues = object, InitialFormValues = object>(
                                                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~
    This type parameter might need an `extends Partial<FormValues>` constraint.

---

I can't prove this PR works, I've tested locally with success by installing it:

npm i  --no-save --install-links <path-to-fork>/final-form-focus

Summary by CodeRabbit

• Chores
  • Build tooling updated to generate and publish TypeScript declaration files, improving IDE support and type safety.
  • Package now declares a typings entry so published packages include TypeScript definitions.
  • Public exports expanded to include type-only exports, ensuring TypeScript consumers have access to full type information.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds TypeScript declaration generation to the build: Rollup is configured with the TypeScript plugin and a build tsconfig that emits declarations; package.json gains a typings entry and devDependency; src/index.ts re-exports ./types.

Changes

Cohort / File(s)	Summary
Build configuration package.json, rollup.config.js, tsconfig.json, tsconfig.build.json	Adds typings field to package.json and @rollup/plugin-typescript devDependency; wires @rollup/plugin-typescript into Rollup with tsconfig.build.json (emits declarations and declaration maps); sets declarationDir in tsconfig.json and adds a build-specific tsconfig that excludes tests.
Public exports src/index.ts	Adds export * from './types' to include type exports in the package's public API.

Sequence Diagram(s)

sequenceDiagram
  participant Dev as Developer/CI
  participant Rollup as Rollup (build)
  participant TS as TypeScript compiler
  participant Dist as dist output (files)

  Dev->>Rollup: run build
  Rollup->>TS: invoke `@rollup/plugin-typescript` with tsconfig.build.json (declaration, declarationMap)
  TS-->>Rollup: emit JS + `.d.ts` and `.d.ts.map` into declarationDir (`dist`)
  Rollup->>Dist: write bundled JS and forward type files
  Dev->>package.json: package.json.typings -> `dist/index.d.ts`

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰
I hopped through configs, tidy and spry,
Rollup and TS made types multiply,
Dist filled with declarations bright,
Now packages wear their typings right,
A little rabbit nods, delight. 🥕

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'expose TS definitions' directly and clearly describes the main change: adding and exposing TypeScript type definitions (.d.ts files) to the package.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

---

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@tsconfig.build.json`:
- Around line 8-10: Update the tsconfig.build.json exclude array to also omit
test-only files so declaration files aren't emitted for tests; specifically add
patterns such as "./src/**/*.test.tsx", "./src/**/*.test.ts", and a directory
pattern like "**/__tests__/**" (or similar) to the existing exclude list in
tsconfig.build.json so future TSX tests or __tests__ folders are ignored by the
declaration emit process.

[erikras-richard-agent]

Excellent work! 👏 This follows the same pattern as your fix for react-final-form-arrays (#186).

What this fixes:

• Generates TypeScript definitions at build time (currently missing)
• Replaces outdated/incompatible @types/final-form-focus
• Adds proper typings field to package.json
• Uses tsconfig.build.json to control declaration generation

Code review:
✅ Correct use of @rollup/plugin-typescript
✅ tsconfig.build.json properly extends base config and excludes tests
✅ Types exported from index.ts via export * from './types'
✅ CodeRabbit approved
✅ Follows Final Form ecosystem conventions

This is part of the broader effort to fix TypeScript type publishing across all Final Form repos. Great contribution!

@erikras - Recommend merge. This fixes a gap in the TypeScript migration.

[erikras-richard-agent]

✅ CodeRabbit feedback addressed

Updated tsconfig.build.json to exclude additional test file patterns:

"exclude": [
  "./src/**/*.test.ts",
  "./src/**/*.test.tsx",      // Added: TSX test files
  "**/__tests__/**"             // Added: Test directories
]

This ensures that declaration files (.d.ts) are not generated for:

• TypeScript test files (.test.ts)
• React/JSX test files (.test.tsx)
• Files in __tests__ directories

Ready for merge! 🎉