AvailabilityZone parameters array marked as invalid

[stevbev]

Getting Incorrect type. Expected "string". for the parameter [ 0, !GetAZs '' ] in the following:

    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref VPC
      AvailabilityZone: !Select [ 0, !GetAZs '' ]
      CidrBlock: !Ref PrivateSubnetRange1a
      MapPublicIpOnLaunch: false
      Tags:
        - Key: Name
          Value: !Sub ${EnvironmentName}-1a-private

The template works fine and creates the VPC and subnets as expected. The issue is the AWS Toolkit extension is marking the parameter as incorrect even though it is valid syntax.

I discovered that when the file first loads in VS Code, there are highlighted syntax errors throughout the template (the Amazon dynamic variables) and after the AWS Toolkit extension loads all of the syntax errors clear. After making any edit to the CloutFormation template, the segment in question becomes marked as invalid again.

• OS: MacOS 12.5
• Visual Studio Code version: 1.70.0
• AWS Toolkit version: 1.46.0

[jpinkney-aws]

I think this might be a limitation of depending on https://github.com/redhat-developer/vscode-yaml. There isn't really a way for us to explicitly tell that project that !Select takes in an array and outputs a string. It just expects AvailabilityZone as a string and when it doesn't see one it errors

[werebear73]

I see this on my Windows 11 version of VSCode as well. I am using the YAML not JSON.