I have the following error: "Cannot find name 'data'.", but I have defined it.

const initialState = () => {
  try {
    const data = window.localStorage.getItem('auth');
  } catch (e) {
    const data = null;
  }

  if (!data) {
    return {
      matrixIsAuthenticated: false,
      matrixUserId: null,
      matrixAccessToken: null,
    };
  } else {
    return data;
  }
};

CodePudding user response：

You should define data variable outside try block first with let and give it value inside try only after that.

CodePudding user response：

First, you need to understand the scope of a block of code. Once you define a variable inside the try block it cannot be accessed outside of it. similar case for the catch also.