what is routeveil fr?

Routeveil is a TypeScript library that adds cinematic visual transitions to React Router applications. When a user moves between pages in a web app, Routeveil coordinates a five-step sequence: it animates the current page out, swaps the route while the view is hidden, waits for the next page to render, animates the new page in, and then restores normal interaction. The goal is to give web apps the kind of polished, film-like scene changes usually seen in native mobile apps. The library provides 20 built-in transitions split into two categories. Page transitions, such as fade, blur, slide, spin, and bounce, animate only the main content area. Overlay transitions, such as pixel, curtain, wipe, iris, tunnel, and dissolve, cover the entire screen through a portal attached to the document body. Each transition accepts its own typed set of options, so developers can control direction, color, duration, origin point, and other parameters specific to that effect. Several transitions are cursor-aware, meaning the animation can radiate from where the user clicked. A key design principle is that page components contain no animation code. Developers wrap their routes in a component called RouteveilView, and persistent interface elements like headers and footers can sit outside it so they stay mounted and stable during transitions. Navigation happens through a custom link component or a programmatic hook, both of which accept a transition name and its options on a per-navigation basis. Omitting the transition property falls back to ordinary navigation. Routeveil also supports previewing a transition without actually changing the URL, which is useful for demos or interactive showcases. It respects reduced-motion preferences, handles external links and modifier clicks with native browser behavior, and allows developers to register custom transitions. The public API is imported from a dedicated subpath, and the package root intentionally exposes no runtime entry point. The full README is longer than what was shown.