twister-react/node_modules/react-bootstrap/lib/utils/createChainedFunction.js

/**
 * Safe chained function
 *
 * Will only create a new function if needed,
 * otherwise will pass back existing functions or null.
 *
 * @param {function} one
 * @param {function} two
 * @returns {function|null}
 */
"use strict";

function createChainedFunction(one, two) {
  var hasOne = typeof one === "function";
  var hasTwo = typeof two === "function";

  if (!hasOne && !hasTwo) {
    return null;
  }
  if (!hasOne) {
    return two;
  }
  if (!hasTwo) {
    return one;
  }

  return function chainedFunction() {
    one.apply(this, arguments);
    two.apply(this, arguments);
  };
}

module.exports = createChainedFunction;