A tiny language for arithmetic over React Native's Animated values.

npm install --save-dev animated.macro

For the best experience, install and configure babel-plugin-macros if you haven't already. Alternatively, this package also exports a standalone Babel plugin for use with Babel 6 or 7, under the name animated.macro/plugin.

Note: Whether you use the macro or the plugin, always import animated from "animated.macro", as seen below.

import { Animated } from "react-native";
import animated from "animated.macro";

const a = new Animated.Value(1);
const b = animated`1 / ${a}`;

Animated.spring(a, { toValue: 2 }).start();

This package also includes a pure-runtime implementation, mainly intended for use in sandbox environments like Expo Snack, where setting up babel-plugin-macros is impractical. You should not rely on it for real-world use in your app, as the compilation overhead may be noticeable.