promise/catch-or-return Restriction
What it does
Ensure that each time a then() is applied to a promise, a catch() is applied as well. Exceptions are made if you are returning that promise.
Why is this bad?
Not catching errors in a promise can cause hard to debug problems or missing handling of error conditions.
Example
Examples of incorrect code for this rule:
javascript
myPromise.then(doSomething);
myPromise.then(doSomething, catchErrors); // catch() may be a little betterExamples of correct code for this rule:
javascript
myPromise.then(doSomething).catch(errors);
function doSomethingElse() {
return myPromise.then(doSomething);
}