console output

err Error: wat
    at f (main.html:6)
    at <anonymous>

main.html

<script>
async function blah() {};

async function f() {
    await blah();
    throw new Error('wat');
}

async function g() {
    await blah();
    await f();
}

g().then(() => {
    console.log('done');
}, (err) => {
    console.log('err', err);
});
</script>