How to add "after" TCL delay command support?

[jackylinpda]

I try to add "after" support via addSimpleProcedure, but it doesn't work:

const sleep = (ms) => {
    return new Promise(resolve => setTimeout(resolve, ms));
}
const after = async () => {
    await sleep(5000);
}
tcl.addSimpleProcedure('after', after);