# What This PR Does
Symbols declared inside exported functions and classes were being
incorrectly flagged with `SymbolFlags::Export`.
For example,
```ts
export function foo<T>(a: T) {
let b = String(a)
return b
}
```
`T`, `a`, and `b` were all flagged as exported.
## Further Work
It doesn't seem like exported enums and interfaces are being included in
`ModuleRecord`. Am I looking in the wrong place, or are they actually
missing?
Add test cases to `oxc_semantic` that check scope flag behavior.
Also contains these tweaks:
- fix: allow disabling `with_module` on `SourceType`
- refactor: move `SymbolTester` to a separate file
- chore: add `Expect` trait & implement it on `SymbolTester`
