Add types to fetch methods

[Bashamega]

Currently, the fetch method is a string, but not all values are valid. We should specify the allowed HTTP methods.
Reference: MDN - HTTP Methods.
I can create a PR for this, but we need a way to handle case insensitivity when checking the method.

[HolgerJeromin]

You are talking about https://developer.mozilla.org/en-US/docs/Web/API/Request/method ?

Currently, the fetch method is a string, but not all values are valid.

yes they are.

fetch('https://github.com/wow', {method: 'HOLGER'}).catch(data => console.error(data)).then(data => console.log(data))
is valid IMO for the web platform, used for example in webDAV.

[Bashamega]

You are talking about https://developer.mozilla.org/en-US/docs/Web/API/Request/method ?

Currently, the fetch method is a string, but not all values are valid.

yes they are.

fetch('https://github.com/wow', {method: 'HOLGER'}).catch(data => console.error(data)).then(data => console.log(data)) is valid IMO for the web platform, used for example in webDAV.

But at least the standards will be available. But I understand your point.

[HolgerJeromin]

We would have to merge all "well known" standards at this point. And if a customer wants to extend this list he had to circumvent typescript a bit.

But we had an issue here in this repo for adding some well known string values for intellisense while keeping string for the rest.
Perhaps @saschanaz can remember where we had this...

[Bashamega]

This is what i mean for intellisense

[HolgerJeromin]

ref #1467 (comment)