@mui/x-charts/internals/useStringInterpolator.js

The community edition of the Charts components (MUI X).

import * as React from 'react';
import { interpolateString } from '@mui/x-charts-vendor/d3-interpolate';
function usePrevious(value) {
  const ref = React.useRef({
    currentPath: value,
    previousPath: undefined
  });
  if (ref.current.currentPath !== value) {
    ref.current = {
      currentPath: value,
      previousPath: ref.current.currentPath
    };
  }
  return ref.current;
}
export const useStringInterpolator = path => {
  const memoryRef = usePrevious(path);
  const interpolator = React.useMemo(() => memoryRef.previousPath ? interpolateString(memoryRef.previousPath, memoryRef.currentPath) : () => memoryRef.currentPath, [memoryRef.currentPath, memoryRef.previousPath]);
  return interpolator;
};