Interface 'TypedDOMStringList<T>' incorrectly extends interface 'DOMStringList'

[thisisamir98]

trying to build this library with typescript version 5.0.4 I get this error:

node_modules/idb/build/entry.d.ts:121:18 - error TS2430: Interface 'TypedDOMStringList<T>' incorrectly extends interface 'DOMStringList'.
  The types returned by '[Symbol.iterator]()' are incompatible between these types.
    Type 'IterableIterator<T>' is missing the following properties from type 'ArrayIterator<string>': map, filter, take, drop, and 9 more.

121 export interface TypedDOMStringList<T extends string> extends DOMStringList {
                     ~~~~~~~~~~~~~~~~~~


Found 1 error in node_modules/idb/build/entry.d.ts:121

After some investigations I found out in the newer versions of javascript the type for iteration on DOMStringList has been officially added.

https://github.com/microsoft/TypeScript/blob/main/src/lib/dom.iterable.generated.d.ts#L80-L82

interface DOMStringList {
    [Symbol.iterator](): ArrayIterator<string>;
}

now updating

export interface TypedDOMStringList<T extends string> extends DOMStringList {
  contains(string: T): boolean;
  item(index: number): T | null;
  [index: number]: T;
  [Symbol.iterator](): IterableIterator<T>;
}

to

export interface TypedDOMStringList<T extends string> extends DOMStringList {
  contains(string: T): boolean;
  item(index: number): T | null;
  [index: number]: T;
  [Symbol.iterator](): ArrayIterator<string>;
}

breaks your library because typescript version 4.8.3 and it does not have ArrayIterator type.

Trying to fix it I found out that removing this line:

https://github.com/jakearchibald/idb/blob/main/src/entry.ts#L261

  [Symbol.iterator](): IterableIterator<T>;

does not break your library and i'm still able to build it successfully,

Could you investigate this? if it's possible I can open a PR to remove that line.

[jimtendo]

I have also hit this issue.

For me, downgrading Typescript to 5.5.4 seems to have worked, so I suspect the amended interface is added from V5.6 upwards.