I give Error objects names (i.e. setting nameproperty, sometimes replacing an existing message property too) because I prefer this over sub-classing Errors, which only is simple on ES 2015 and with a functional style I don't have a single "class", "this", "bind" in any of my code, it's "just functions".

This is perfectly legal JS. It should just be a normal object.

Code

const e = new Error('test');
e.name = 'TestError';
trace(e.name + ' ' + e.message);

Result

Error: set name: not writable!