Unexpected `A class must be declared after its base class.` error with class expression

[vvakame]

TypeScript Version: 2.0.2

Code

let cat = new class extends class {
    speak() {
        return "???";
    }
} {
    speak() {
        return "meow";
    }
}();
console.log(cat.speak());

Expected behavior:

We can compile this code.

Actual behavior:

$ tsc -v
Version 2.0.2
$ tsc sample.ts
$ sample.ts(1,29): error TS2690: A class must be declared after its base class.

This code can compiled by tsc 2.0.0.

[RyanCavanaugh]

You write some weird code 😉. Is this an actual use case we need to fix for 2.0, or just some testcase?

[vvakame]

It is testcase 😉.

[kitsonk]

Wow, that is valid ES6. The crazy things people write.

[aluanhaddad]

I don't know, this sample is making me warm up to class based programming in JavaScript 😉 It's great when everything is first class!

[pankleks]

Well actually it's real case when you don't use modules and you compile into single file.
Looks like in some cases TSC is lost with solving dependencies.
I have this issue with base class in one file / derived class in another.

I'm using TS 2.1 dev.
Checking on 2.0 RC ...

[pankleks]

Same on 2.0.2 :(

[kitsonk]

This is still an open issue, with a milestone target of being fixed in TypeScript 2.1.

Expecting it to be magically fixed before it is closed and marked as fixed and has an associated commit that has been merged into master is folly.

[pankleks]

Just informing that's it's not regression of 2.1 as it exist on 2.0.2