"Cannot access 'aVariable' before initialization" with React

[alexis-regnaud]

On a React project, I switched ts-jest + babel-jest to @swc/jest Few tests are now failing with the same type of error : Cannot access 'aVariable' before initialization which always happen in a specific situation.

The error is thrown when the variable is defined further in the component, but used before by a React function :

function AComponent() {
  const aFunction = () => { //Case 1
    return aVariable;
  };

  const [selected, setSelected] = useState(() => { //Case 2
    return aVariable;
  });

  const otherTest = useMemo(() => aVariable, []); //Case 3

  const aVariable = 'Ceci est un test';
}

• Case 1 work
• Case 2 fail
• Case 3 fail

[yasirrafiq786]

Any update around this?

[erfanium]

@kdy1

I have time to work on it. Any hint about this issue and where should I start?

[kdy1]

@erfanium You can add tests to https://github.com/swc-project/swc/tree/ebebd608750bf63d6f715350835a1a5349efdb68/crates/swc/tests/fixture/jest and do UPDATE=1 cargo test to investigate

[bryanjtc]

any update on fixing this issue?

[C-o-d-e-C-o-w-b-o-y]

bump