Extending Map with wrong number of type arguments shows no error

[ghost]

TypeScript Version: 3.2.0-dev.20181017

Code

class MyMap extends Map<string> {}

Expected behavior:

Error: No base constructor has the specified number of type arguments.

Actual behavior:

No error.

Issue was introduced by #25374. The issues it fixed, #23551 and #25362, seem to work fine even if I revert the change. CC @sandersn to confirm that JS class augmentation has been fixed and #25374 can be reverted.

[sandersn]

I change I made recently made sure that base type nodes lookup accounts for jsdoc everywhere, instead of a few places. That's probably what fixed the original issues. Reverting the lib changes seems like the right thing.

I can't find the PR right now, though.