Why does an error thrown in a promise reject/catch method not trigger the global error handler? How can a global error handler that includes these be created? In my app the global error handler logs the error.
function doPromise() {
return Promise.reject()
}
window.addEventListener('error', function (e) { console.log('Global handler ' + e.message) })
doPromise()
.then()
.catch(e => {
console.log('Promise catch')
throw new Error('Promise catch error') // Does not trigger global error handler
})
throw new Error('Core error') // To prove global error handler is working
This is not an error, but Unhandled Rejection:
The unhandledrejection event is sent to the global scope of a script when a JavaScript Promise that has no rejection handler is rejected
Working version of the code:
function doPromise() {
return Promise.reject()
}
window.addEventListener('error', function(e) {
console.log('Global handler ' + e.message)
})
window.addEventListener('unhandledrejection', event=>{
console.log('Unhandled rejection', event)
}
);
doPromise().then().catch(e=>{
console.log('Promise catch')
throw new Error('Promise catch error')
// Does not trigger global error handler
}
)
throw new Error('Core error')
// To prove global error handler is working