Untitled

<!DOCTYPE html>
<html>

  <head>
  </head>

  <body>
    <script type="module" src="./othermod.js"></script>
  </body>

</html>

const handle = setInterval(() => {
    const p = document.createElement("p");
    p.appendChild(
        document.createTextNode(`diffMode = ${diffMode}`)
    );
    document.body.appendChild(p);
}, 250);
setTimeout(() => {
    clearInterval(handle);
}, 1000);

export var diffMode = false;
export function setDiffMode(flag) {
    diffMode = flag;
}

import {diffMode, setDiffMode} from "./main.js";

setTimeout(() => {
    setDiffMode(true);
}, 500);