escape-case.md

Require escape sequences to use uppercase values

✅ This rule is part of the recommended config.

🔧 This rule is auto-fixable.

Enforces defining escape sequence values with uppercase characters rather than lowercase ones. This promotes readability by making the escaped value more distinguishable from the identifier.

Fail

const foo = '\xa9';
const foo = '\ud834';
const foo = '\u{1d306}';
const foo = '\ca';

Pass

const foo = '\xA9';
const foo = '\uD834';
const foo = '\u{1D306}';
const foo = '\cA';