S008: negated-is-type-can-use-not-is

Metadata

• Code: S008
• Rule: negated-is-type-can-use-not-is
• Status: Stable since v0.0.1
• Quick fix: always available

What it does

Detects negated type checks written as !(a is T).

Why is this bad?

Tolk has a dedicated !is operator, which is clearer than negating is.

Example

if (!(value is int)) {
S008: negated `is` type check can use `!is`
    return;
}

Use instead:

if (value !is int) {
    return;
}