从 AWS 全局变量中替换字符串中的变量

Question

I am writing a sample app for CDK and writing some SSM values but want to replace the current region in the string value written based on global variables (eg {{global:REGION}} in the string. when synth / deploying a project, how do I lever environment / global context values in an existing string so that it writes the value into the string when pushing the values into AWS?

eg ssmParamterValue = 'I am working in region {{global:REGION}} which should be written'

I would expect the value above when written to SSM would be: 'I am working in region us-east-1 which should be written'

I have other environment values I am setting as well, but this is one of the globals available for testing.

Thanks Nick

Answer 1

If you are following the AWS recommendation to explicitly define env at synth-time ^* , you can reference the env string values using the Stack construct properties (eg Stack.region and Stack.account ).

// MyStack.ts
const ssmParamterValue = `I am working in region ${this.region} which should be written`

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* If you are instead using environment-agnostic stacks, these values will be tokens at synth-time and resolved to strings at deploy-time. CDK is usually smart enough to convert typescript interpolated strings to the CloudFormation Join equivalent.