export function isIterableObject(value) { return value != null && typeof value === 'object' && Symbol.iterator in value; } export function isObjectLike(value) { return typeof value === 'object' && value !== null; } export function isPromise(value) { return isObjectLike(value) && typeof value['then'] === 'function'; } export function promiseReduce(values, callbackFn, initialValue) { let accumulator = initialValue; for (const value of values) { accumulator = isPromise(accumulator) ? accumulator.then(resolved => callbackFn(resolved, value)) : callbackFn(accumulator, value); } return accumulator; } export function hasOwnProperty(obj, prop) { return Object.prototype.hasOwnProperty.call(obj, prop); }