@react-bootstrap/react-popper/lib/esm/utils.js

React wrapper around Popper.js

/**
 * Takes an argument and if it's an array, returns the first item in the array,
 * otherwise returns the argument. Used for Preact compatibility.
 */
export var unwrapArray = function unwrapArray(arg) {
  return Array.isArray(arg) ? arg[0] : arg;
};

/**
 * Takes a maybe-undefined function and arbitrary args and invokes the function
 * only if it is defined.
 */
export var safeInvoke = function safeInvoke(fn) {
  for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
    args[_key - 1] = arguments[_key];
  }

  if (typeof fn === "function") {
    return fn.apply(undefined, args);
  }
};