react-native-flip/example/node_modules/react-native-reanimated/lib/reanimated1/derived/acc.js

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import { set, add, proc } from '../base';
import AnimatedValue from '../core/InternalAnimatedValue';

const procAcc = proc(function (v, acc) {
  return set(acc, add(acc, v));
});

export default function acc(v) {
  const acc = new AnimatedValue(0);
  return procAcc(v, acc);
}