I was able to export a function that accept and call a callback when the
promise resolves:
unsafeWindow.GM_getValue = exportFunction(function GM_getValue(name,
defaultValue, callback) {
GM.getValue(name, defaultValue).then(value => {
if (callback) callback(value);
});
}, unsafeWindow);
In the content window's scope, you can call it like:
GM_getValue('name', 'default value', value => console.log(value));
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