[JSDoc] Can't assign Set<unknown>

[Bart Louwers (louwers)]

I just found out that this works with TypeScript 5.x

function acceptsStringSet(/** @type {{set: Set<string>}} **/ { set }) {}

const set = new Set();

acceptsStringSet({ set });

But not with tsgo yet. I am not reporting it as an issue since it is " OK to log panics, but nothing else please".

But I wonder what this feature is called?

Interestingly, the pure TS version is not valid with either:

function acceptsStringSet(set: Set<string>) {}

const set = new Set();

acceptsStringSet(set);

[Jake Bailey (jakebailey)]

This is intentional; in the old compiler, JS constraints defaulted to any. Now they match TS files.

[Bart Louwers (louwers)]

Good to know!