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THE TYPESCRIPT WORKSHOPをやる時のハマりどころ・注意どころ

概要

THE TYPESCRIPT WORKSHOPをやった時に感じた、ハマりどころ・注意どころをメモしました。

Node.jsの相互互換性問題

JavaScriptでlambdaを書く部分を以下のように修正しないとSyntaxErrorがでます。
lambdaの設定で、runtime: lambda.Runtime.NODEJS_10_Xとしているので、Node.jsが`ES Moduleのsyntaxを理解できないことが原因です。

Before

hitcounter.js
import { DynamoDB, Lambda } from 'aws-sdk';

After

hitcounter.js
const { DynamoDB, Lambda } = require('aws-sdk');

DynamoDBはcdk destroyで削除されない

気をつけましょう。
これはデフォルトの挙動で、RemovalPolicyRETAINになっているためです。
(確かにデフォルトの挙動で削除されたら恐いですし)

以下のようにすることでcdk destroyでDnynamoDBも削除できるようになります。

cdk-workshop-stack.ts
const table = new dynamodb.Table(this, 'Hits', {
  partitionKey: { name: 'path', type: dynamodb.AttributeType.STRING },
  removalPolicy: cdk.RemovalPolicy.DESTROY
});
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