lib/index.js
function del(key, cb) {
  return type(key) != 'array'
    ? localForage.removeItem(key).then(wrap(cb), cb)
    : Promise.all(key.map(del)).then(wrap(cb), cb);
}
function del(key, cb) {
  return type(key) != 'array'
    ? localForage.removeItem(key).then(wrap(cb), cb)
    : Promise.all(key.map(del)).then(wrap(cb), cb);
}
function del ( key , cb ) { return type ( key ) != 'array' ? localForage . removeItem ( key ) . then ( wrap ( cb ) , cb ) : Promise . all ( key . map ( del ) ) . then ( wrap ( cb ) , cb ) ; }
Delete `key`.

@param {Array|Mixed} key
@param {Function} cb
Delete key .