在 Typescript 中的 AWS CDK 应用程序中读取道具

Question

I am a newbie to go language and I am passing some properties props? to my CDK appstack with the following signature: props?: cdk.StackProps

Now, when I just print the variable props on the console by typing console.log(props) I see this (as expected):

{ env: { account: '112358132134', region: 'us-west-2' } }

However, when I do something like this: console.log(props['env']) I get the following error:

console.log(props["env"]["account"])

I get this error:

error TS2532: Object is possibly 'undefined'.

The goal for me is to use this property for my business logic. How can I read it?

Answer 1

The access to account property may fail as the env property is optional .

Your TypeScript settings seem to have strict null checking turned on, thus code won't compile due to the potential TypeError .

You can turn off the strict null checking , although generally it's better to keep it enabled.

You can also rewrite your code to cope with possibility of env being undefined

console.log(props.env?.account); // If You have high enough TS version
// OR
console.log(props['env'] ? props['env']['account'] : undefined);