Declaration emit drops expando function properties whose assignments are not top-level expression statements

[mds-ant]

Steps to reproduce

main.ts:

function Foo(): void { }
Foo.top = 1;
let d: number = (Foo.inInitializer = 2);
if (true) {
    Foo.inBlock = 3;
}

tsgo --declaration main.ts

Behavior with typescript@6.0

declare function Foo(): void;
declare namespace Foo {
    var top: number;
    var inInitializer: number;
    var inBlock: number;
}
declare let d: number;

Behavior with tsgo

declare function Foo(): void;
declare namespace Foo {
    var top: number;
}
declare let d: number;

[jakebailey]

I suspect this is sort of intentional (or at least, was not thought of), given our reparsing system... Does anyone actually do this?

[ahejlsberg]

I think we need to continue to support this. It is not uncommon for expando property initialization to sit in if statements or other nested constructs.