Optional chaining arg default with this

[samdenty]

TypeScript Version: 3.7.x-dev.201xxxxx

Search Terms: Optional chaining, argument default this

Code

class Test {
    public c(a = this.a?.b) {}
}

Expected behavior:

Shouldn't throw reference error

Actual behavior:

Throws reference error for _a

c(a = (_a = this.a) === null || _a === void 0 ? void 0 : _a.b) {
  var _a;
}

Playground Link: https://www.typescriptlang.org/play/index.html#code/FAYwNghgzlAEAqBTKAXWBvYtuwA4FcAjMASxFglgF4NZCAuWARlgF9gOc8jTyQAKSjRQALElAB0EAPwTCASgycc7dsAB2iAO4JkKfvIkD5QA

[DanielRosenwasser]

Duplicate of #36295

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.