Is there a way to get a variable from another script?

Question

I created a chrome extension, the extension needs to get a variable from a script to use it in another context, i can access the variable using browser console but i can't access it by my extension using window.VARIABLE_NAME

const getCodeBtn= document.getElementById('get-code-btn');

async function getCode() {
  let [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
  chrome.scripting.executeScript({
    target: { tabId: tab.id },
    function: addCode,
  })
}

//we need to add code in a website input
function addCode() {
  const input = document.getElementById('some-id');
  const btn = document.getElementById('some-id');

  input.value = window.code;  //window.code is undefined
  console.log(window.code)  // undefined
  btn.click();
}

getCodeBtn.addEventListener('click', getCode)

I still can access the variable value in browser console

code;  // 1235469

Answer 1

According to documentation, from Chrome 95+ you can choose the execution environment to run the script in with the world parameter. So, in order to run in the web page's environment, your injection should be something like:

chrome.scripting.executeScript({
    target: { tabId: tab.id },
    func: addCode,
    world: 'MAIN'
  })