Rule: ban-comma-operator

Disallows the comma operator to be used.

Using the comma operator can create a potential for many non-obvious bugs or lead to misunderstanding of code.

foo((bar, baz)); // evaluates to 'foo(baz)' because of the extra parens - confusing and not obvious

switch (foo) {
    case 1, 2: // equals 'case 2' - probably intended 'case 1: case2:'
        return true;
    case 3:
        return false;
}

let x = (y = 1, z = 2); // x is equal to 2 - this may not be immediately obvious.

"ban-comma-operator": true

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