How to reject a JavaScript promise with `TypeError` by calling the resolve function?
javascript
Ethan JacksonWhile reading the promise documentation I came across this statement:
If it's called with the same value as the newly created promise (the promise it's "tethered to"), the promise is rejected with a
TypeError.
which I can't understand, what value should I pass to resolve() to reject the promise with TypeError?
I would like to see some example code that reproduces this behavior.
Answer
I've copied the code from the link in the question:
// 1. Resolving with the promise itself
const rejectedResolved1 = new Promise((resolve) => {
// Note: resolve has to be called asynchronously,
// so that the rejectedResolved1 variable is initialized
setTimeout(() => resolve(rejectedResolved1)); // TypeError: Chaining cycle detected for promise #<Promise>
});
The comments should explain how and why it produces the described behavior.