I was trying to figure out wherever Immutable.js declares its TypeScript support policy? In other words: which is the lowest supported version of TypeScript?

In the readme “TypeScript v2.1.0 or higher“ is mentioned:

But in CI the lowest tested version is 4.5 (context: #1988 (comment)):

Seems like the readme might be outdated.

A good question is, if it should say: “you will need TypeScript 4.5 or higher”, or better: “you will need TypeScript 5.0 or higher”?

I am suggesting TypeScript 5.0, because I would like to drop suport for TypeScript 4.x in the next release of TSTyche (tstyche/tstyche#372). The reason: TypeScript 5.0 will be two years soon and DefinitelyTyped already dropped support for 4.x, microsoft/DefinitelyTyped-tools#1110. (They dropped testing, to be exact.)

In the other hand, it would not be nice to make any changes that block Immutable.js to upgrade TSTyche.

That is why I was wondering to ask about your plans of TypeScript support policy?