ref: https://github.com/ShuzoN/zut/issues/34 `@types/aws-lambda` を使ってlambdaの型ちゃんと扱いたい https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/aws-lambda
ref: #34
@types/aws-lambdaを使ってlambdaの型ちゃんと扱いたいhttps://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/aws-lambda