TypeScript 5.5 compatibility for ObservableSet

[SimenB]

Intended outcome:

MobX's ObservableSet should implement all Set methods.

https://devblogs.microsoft.com/typescript/announcing-typescript-5-5/#support-for-new-ecmascript-set-methods

Actual outcome:

It doesn't, leading to

node_modules/mobx/dist/types/observableset.d.ts:25:22 - error TS2420: Class 'ObservableSet<T>' incorrectly implements interface 'Set<T>'.
  Type 'ObservableSet<T>' is missing the following properties from type 'Set<T>': union, intersection, difference, symmetricDifference, and 3 more.

25 export declare class ObservableSet<T = any> implements Set<T>, IInterceptable<ISetWillChange>, IListenable {

How to reproduce the issue:

https://www.typescriptlang.org/play/?target=99&ts=5.5.2#code/JYWwDg9gTgLgBAbzgeQEYGcCmUBuBDVAG0wGVN4BfOAMyghDgHIQJUAPRgbgChuBjCADt08FuzIwAXHAkAeAK6CA1oIgB3QQD44AXjiDMalBmz4ipcgAoAlDyA

Changing TS versions to 5.4.5 resolves the type error.

Playground doesn't have skipLibCheck: false, otherwise the implements within the MobX type would fail rather than the satisfies.

Versions

mobx@6.12.3

[kubk]

Should be fixed by #3853

[SimenB]

Duplicate of #3850