Remove some @ts-ignore

[QuentinLemCode]

Hello

I have open this PR in order to remove some @ts-ignore comments to improve Typescript type safety.

Types have been adjusted to reflect the correct usage in the codebase.
Some utility function has been added to parse headers to a proper value when needed.

Feel free to ask question and add review comments, I will update as needed

Thanks !

[xavdid-stripe]

Looks like tests didn't run, i'm going to close and re-open the PR to see if it refreshes

[xavdid-stripe]

@QuentinLemCode looks like the build step is failing with a new type error. Can you address?

[QuentinLemCode]

@QuentinLemCode looks like the build step is failing with a new type error. Can you address?

Yes I see, this is caused by the old version of Typescript you use (4.9.4, latest is 5.5). My IDE was using latest version and so it did not show me the error.

I will fix this but I recommend to upgrade your Typescript version which handle type inference more precisely

[prathmesh-stripe]

There is a test failing on Node 12 related to one the changes you made in utils. Can you please fix that?

[QuentinLemCode]

There is a test failing on Node 12 related to one the changes you made in utils. Can you please fix that?

Hello @prathmesh-stripe

I found the culprit : the URL interpolator function should work with number, string or boolean. I have added a type guard to ensure the variable as the proper type, otherwize return ''.

This allowed me to spot a potential bug, when using URL interpolator with the number 0, it would make the condition falsy and return an empty string ''
I have added a test for this.