Convert to TypeScript

[erikras]

Goodbye flow! 👋

[Copilot]

Pull Request Overview

This PR converts the project from Flow to TypeScript while updating build configurations, tests, and dependencies accordingly.

• Added tsconfig files for tests and builds
• Converted source and test files from Flow to TypeScript and updated type definitions
• Updated bundler, Babel, ESLint, and package scripts to support TypeScript

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tsconfig.tests.json, tsconfig.build.json	New TypeScript configuration files for tests and builds
tests/decorator.test.ts	Converted tests to TypeScript with improved type annotations
src/index.ts, src/decorator.ts	Converted source files from Flow to TypeScript, updating APIs
rollup.config.js	Updated build configuration to use TypeScript and new globals
package.json	Updated package configuration and dependencies for TypeScript conversion
package-scripts.js	Converted to ESM and updated scripts for TypeScript builds
eslint.config.js	New ESLint configuration supporting TypeScript
.github/workflows/*, .babelrc	Updated CI/CD and Babel configurations for TypeScript

Comments suppressed due to low confidence (2)

tests/decorator.test.ts:225

• Please verify that the expected call count for afterSubmitFailed is intentionally set to 2 in this test case, as previous tests anticipated a single call.

expect(afterSubmitFailed).toHaveBeenCalledTimes(2)

rollup.config.js:60

• Confirm that the external predicate correctly covers all intended dependencies and peer dependencies after the TypeScript conversion.

external: makeExternalPredicate([

[Copilot]

Pull Request Overview

This PR converts the codebase from Flow to TypeScript, updating configuration files, build scripts, and tests accordingly while removing legacy Flow files.

• Introduces new tsconfig files for tests and build
• Converts source and decorator code to TypeScript and updates Babel/Rollup configurations
• Updates ESLint and CI configurations to support TypeScript

Reviewed Changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tsconfig.tests.json	New TypeScript config for tests
tsconfig.build.json	New TypeScript config for build
tests/decorator.test.ts	Updated tests with TypeScript types and async patterns
src/index.ts	Updated entry file using TypeScript exports
src/index.js.flow & src/index.js	Removed Flow type files
src/decorator.ts	Converted decorator implementation from Flow to TypeScript
rollup.config.js	Updated build config for TypeScript and dependency management
package.json & package-scripts.js	Updated scripts and metadata for TypeScript conversion and build tooling
eslint.config.js & .eslintrc	Updated ESLint configurations to support TypeScript
.babelrc	Adjusted Babel config to switch from Flow to TypeScript with decorator support
.github/workflows/*	New/updated CI workflows and automation scripts

Comments suppressed due to low confidence (2)

tests/decorator.test.ts:27

• Using optional chaining when accessing mock call parameters may hide cases where the callback was not invoked; please verify that this behavior is intentional and that the tests accurately capture the expected callback call scenarios.

expect(beforeSubmit.mock.calls[0]?.[0]).toBeDefined()

.babelrc:19

• Ensure that the new decorator configuration aligns with your project's usage patterns, as switching from Flow to TypeScript may require verifying that the decorator settings (e.g. 'decoratorsBeforeExport': true) are compatible with the TypeScript compiler settings.

{ "version": "2018-09", "decoratorsBeforeExport": true }