Add toString function to action creators

[mAAdhaTTah]

This allows people migrating from redux-actions (and using == to coerce those actions to stringst to check against action.type) to continue to do so as part of an incremental transition.

---

Thank you for your contribution! :thumbsup:

Please makes sure that these checkboxes are checked before submitting your PR, thank you!

• [X] Rebase before creating a PR to keep commit history clean
• [X] Clear node_modules and reinstall all the dependencies: npm run reinstall
• [X] Run checker npm script: npm run check

Extra checklist:

• [X] Always add some description and refer to all the related issues using # tag

For new feature:

• [x] Update API docs
• [ ] Add examples to demonstrate new feature
• [ ] Add type unit tests
• [x] Add runtime unit tests

Left out the above because my intention wasn't necessarily to introduce this as a usable API but as a js -> ts migration path.

[piotrwitek]

Thanks for the initial work.

For this to be merged we need to complete all the points in the new feature checklist.

Also please remember to extend this: https://github.com/piotrwitek/typesafe-actions/blob/master/src/utils.ts#L19

For tests we need:

• unit tests to confirm toString coercion works correctly
• type tests to confirm discriminated union works correctly in switch case example

[mAAdhaTTah]

Added runtime tests. Will add documentation / examples, but my original thought was not to expose it to the type system, as its intended as a migration path to TS, not something you'd rely on when using it w/ TS.

[piotrwitek]

Right, I agree to skip exposing it in API docs & examples for now. Please just add a comment in the code as well, saying it's redux-actions migration compatibility. I might get rid of getType interna static method in place of toString at some point as they are duplicates.

[mAAdhaTTah]

Ok, I think we're gtg here then.

[piotrwitek]

Great job! Thanks a lot for all the work 🙇