fix: export symbol and interface to fix type exporting in consuming packages

[wyattberlinic]

I'm trying to use the library and I get TS4023.

Exported variable 'promiseAction' has or is using name 'promiseSymbol' from external module ".../git/saga-test/node_modules/@teroneko/redux-saga-promise/dist/src/index" but cannot be named.

Minimal example:

const promiseAction = promiseActionFactory<string>().simple<string>('ACTION');
export { promiseAction };

See microsoft/TypeScript#37888 (comment) for a discussion of the solution.

If I export these types then I have no issues.

[teneko]

Hey. Okay, let's investigate this. Currently promiseSymbol's only purpose is to to be used to infer the resolve value type of the promise. It is NOT intended to be ever used in productive code or in other words: they symbol should just lying around without being used once in the view of JavaScript. 😄

The symbol should only serve as unique path in the language system of TypeScript to store custom types. I already spotted the problematic line: https://github.com/teroneko/redux-saga-promise/blob/f1b5cd6e23215b36e4fbfd74999c6321e6008413/src/index.ts#L124

I appreciate your effort but this drastic solution to export everything is really the last resort. I will report back when the fix has been introduced.

[wyattberlinic]

So, I think an alternative solution is to ensure that symbol is not in any of the exported types. It might be possible to do some type surgery on the exported types/functions to eliminate that symbol from the public API.

[teneko]

So I have done. Version 1.2.3 has been published. Can you take a look?

[wyattberlinic]

Seems to have solved my problem, thank you!