no-optional-catch-binding
disallow optional error variable binding in catch blocks (no-optional-catch-binding)
JavaScript allows error variables to be optionally omitted from catch clauses. For example:
(() => {
try {
throw new Error();
return 1;
} catch {
// The caught exception is not used, and has been omitted.
return 2;
}
})();Rule Details
This rule requires that each catch clause includes an error variable binding.
An example of incorrect code for this rule:
/*eslint no-optional-catch-binding: "error"*/
(() => {
try {
throw new Error();
return 1;
} catch {
return 2;
}
})();An example of correct code for this rule:
/*eslint no-optional-catch-binding: "error"*/
(() => {
try {
throw new Error();
return 1;
} catch (err) {
return 2;
}
})();When Not To Use It
If you want to allow optional catch binding, you can turn this rule off.