Support for "Unhandled promise rejection" / "Uncaught (in promise)" #424
Description
Example use case (JSBin):
var p = new Promise(function(resolve, reject) {
window.setTimeout(
function() {
reject();
}, 10);
});
p.then(function () {
console.log('done!');
});If the promise throws an exception, and there's no error handler, the browser will spit out an uncaught promise error.
