create a synchronous function that gets the clipboard value then sets it to local storage in javascript

To create a synchronous function that gets the clipboard value and then sets it to local storage in JavaScript, you can use the navigator.clipboard.readText() method to read the clipboard value and the localStorage.setItem() method to set it to local storage. Here's an example:

index.tsx
function getClipboardValueAndSetToLocalStorage() {
  let clipboardValue;
  navigator.clipboard.readText()
    .then(text => {
      clipboardValue = text;
      localStorage.setItem('clipboardValue', clipboardValue);
    })
    .catch(err => {
      console.error('Failed to read clipboard text: ', err);
    });
  
  return clipboardValue;
}
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In this function, we declare a clipboardValue variable to store the clipboard value. We use the navigator.clipboard.readText() method to read the clipboard text and then set the clipboardValue variable to the text. We then use the localStorage.setItem() method to set the clipboardValue variable to local storage.

Since navigator.clipboard.readText() returns a promise, we need to use the .then() method to handle the success case and the .catch() method to handle errors.

Finally, we return the clipboardValue variable, although it may be undefined if the clipboard reading process is not finished yet.