The error was happening here:

let moonPortfolio;

...

moonPortfolio = JSON.parse(localStorage.getItem('moonPortfolio'));

I found this answer which makes sense, however I'm still getting that error after this refactor:

As the error says, localStorage.getItem() can return either a string or null. JSON.parse() requires a string, so you should test the result of localStorage.getItem() before you try to use it.

if (portfolio.length === 0) {

  const storedPortfolio = localStorage.getItem('moonPortfolio');



  if (typeof storedPortfolio === 'string') {

    moonPortfolio = JSON.parse(localStorage.getItem('moonPortfolio'));

  }

  else {

    moonPortfolio = [];

  }



  if (moonPortfolio) {

    const savedPortfolio = Object.values(moonPortfolio);

    this.props.fetchAllAssets();

    // this.props.addCoins(savedPortfolio);

  }

}

I first set the results of localStorage moonPortfolio to a var, then check if the var is typeof string. Yet still getting the typescript error?

Any thoughts or direction here?