@type IS_TYPE:IS_NAME => IS_DESCRITPION
@arg (IS_METHOD_NAME)IS_TYPE:IS_NAME => IS_DESCRIPTION
@return (IS_METHOD_NAME)IS_TYPE:IS_NAME => IS_DESCRIPTION
// @type React.Component:DB => DESC
class DB extends React.Component {
}
// @type Function:forEachReq => DESC
// @arg (forEachReq)Transaction:tx => DESC
// @arg (forEachReq)Array<String>:arr => DESC
// @arg (forEachReq)Callback:suc => DESC
// @return (forEachReq)Any:anObject => DESC
async forEachReq(tx, arr, suc) {
}