The `Headers` type should be iterable

Works in Chrome, Edge, and Firefox:

const headers = new Headers({a: 1, b: 2});

console.log(Object.fromEntries(headers));

In TS:

No overload matches this call. Overload 1 of 2, ‘(entries: Iterable<readonly [PropertyKey, any]>): { [k: string]: any; }’, gave the following error. Argument of type ‘Headers’ is not assignable to parameter of type ‘Iterable<readonly [PropertyKey, any]>’. Property ‘[Symbol.iterator]’ is missing in type ‘Headers’ but required in type ‘Iterable<readonly [PropertyKey, any]>’. Overload 2 of 2, ‘(entries: Iterable<readonly any[]>): any’, gave the following error. Argument of type ‘Headers’ is not assignable to parameter of type ‘Iterable<readonly any[]>’. Property ‘[Symbol.iterator]’ is missing in type ‘Headers’ but required in type ‘Iterable<readonly any[]>’.

https://developer.mozilla.org/en-US/docs/Web/API/Headers#browser_compatibility https://caniuse.com/mdn-api_headers_--iterator

Edit: While we’re on the subject, is there any reason not to add entries, keys, and values?

[glen-84]

Ahhh, so when I added ES2019.Object for Object.fromEntries, I lost dom and dom.iterable.

Thanks a lot!

[saschanaz]

dom and dom.iterable are included by default but not when you manually set the lib field, that’s why 😁

Anyway it seems you don’t have the issue anymore, good to hear that!