convert-to-arrow - codemod for js/ts files.

Codemod to safely convert function declarations into equivalent const arrow-function expressions.

``ts
// before
export function getUser<
// user id type
ID extends string | number,
>(id: ID): Promise {
return db.users.find(id)
}

// after (auto-generated)
export const getUser = <
// user id type
ID extends string | number,
>(id: ID): Promise => {
return db.users.find(id)
}
`

Compatible with TypeScript and JavaScript. See fixtures for more examples

Quick-start (no install required)

run in the root of your repo - converts all files in the current directory and subdirectories:
`bash
npx convert-to-arrow
`

or specify a sub-folder / glob (defaults to */.{ts,tsx}):
`bash
npx convert-to-arrow src
`
More path options see advanced usage

Safety checklist

- Commit/stash your work first – revert is instant.
- Run the codemod
- Review the diff
- Run test suite / type-checking
- Check the files for identation changes – the codemod tries to preserve the original formatting, but it may not always succeed.

Advanced usage

The CLI currently exposes one optional directory flag:

$3


`bash

convert only files under ./src

npx -y convert-to-arrow src

convert two workspaces

npx -y convert-to-arrow "packages/*/src"

full glob (quotes required for zsh)

npx -y convert-to-arrow "*/.tsx"
`

Contributing / local development

`bash
git clone https://github.com/richard-unterberg/convert-to-arrow
cd convert-to-arrow
npm i # install dependencies
npm run lefthook # git hooks
npm run dev # runs the codemod on this project (should convert test/fixtures.ts)
npm run build # build the codemod - see dist
``

Pull requests & issues are welcome!