rtl‑css‑js is a small JavaScript library that takes a “CSS‑in‑JS” style object (or its kebab‑case equivalent) and flips all direction‑sensitive properties (e.g., `paddingLeft` → `paddingRight`, `margin`, `border`, `background` etc.) so the same styles can be used for right‑to‑left locales. It’s aimed at front‑end developers who write inline or library‑based CSS in JavaScript (React, Aphrodite, JSS, Fela, etc.) and need an easy way to generate RTL equivalents without manually rewriting CSS strings.