Incorrect instanceof behavior when extending native Error

[whatisaphone]

TypeScript Version: 2.1.4

Code

class TestError extends Error { }
const works = (new TestError()) instanceof TestError;
console.log(works);

Expected behavior: (and behavior in Node.js 6.2.1)

works is true

Actual behavior:

works is false

[DanielRosenwasser]

Sorry about this - it was an intentional breaking change and documented here. Sorry about the inconveniences you may have encountered.

Marking this issue as a duplicate of #12123.

[whatisaphone]

That's what I get for not reading the release notes! Thanks for the link.