no-ex-assign.md

Pattern: Reassignment of exception parameter

Issue: -

Description

Reassigning the exception parameter in a catch clause makes it impossible to reference the original error afterward. Since there's no alternative way to access the error object, this assignment permanently loses the error information.

Examples

Example of incorrect code:

try {
  doSomething();
} catch (e) {
  e = 10;
  e = new Error('different error');
  e = null;
}

Example of correct code:

try {
  doSomething();
} catch (e) {
  const errorCode = 10;
  const newError = new Error('different error');
  handleError(e);
}