@sanity/form-builder/lib/hooks/usePrevious.js

Sanity form builder

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.usePrevious = usePrevious;
var _react = require("react");
/**
 * A hook that returns the previous value of a component variable
 * This might be provided by React in the future (https://reactjs.org/docs/hooks-faq.html#how-to-get-the-previous-props-or-state)
 * @param value The value to track. Will return undefined for first render
 */

function usePrevious(value, initial) {
  var ref = (0, _react.useRef)(initial);
  (0, _react.useEffect)(() => {
    ref.current = value;
  }, [value]);
  return ref.current;
}