export const isWx = () => (
  typeof wx !== 'undefined'
    && typeof wx.request === 'function'
);

export const isFormData = val => (
  (typeof FormData !== 'undefined')
    && (val instanceof FormData)
);

export const runFn = (fn, ...params) => {
  if (typeof fn === 'function') return fn(...params);

  return fn;
};

export const isUndefined = val => typeof val === 'undefined';
export const isNullOrUndefined = val => val === null || typeof val === 'undefined';