react-native-flip/example/node_modules/@egjs/hammerjs/src/utils/bool-or-fn.js

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import { TYPE_FUNCTION } from './utils-consts';
/**
 * @private
 * let a boolean value also be a function that must return a boolean
 * this first item in args will be used as the context
 * @param {Boolean|Function} val
 * @param {Array} [args]
 * @returns {Boolean}
 */
export default function boolOrFn(val, args) {
  if (typeof val === TYPE_FUNCTION) {
    return val.apply(args ? args[0] || undefined : undefined, args);
  }
  return val;
}