What version of TypeScript are you using?

2.3.2

What version of typescript-eslint-parser are you using?

master

What code were you trying to parse?

class C {
    async * f() {
        const x = yield* g();
    }
}

What did you expect to happen?

generator: true on FunctionExpression.

What happened?

generator: false on FunctionExpression.

Stage 3 async iteration spec: https://tc39.github.io/proposal-async-iteration/#prod-AsyncGeneratorMethod

The TypeScript parser provides an asteriskToken on the MethodDeclaration node that can be used for this.