environment file and variables don't work

[Greeley]

            "envFile": "${workspaceFolder}/.vscode/.env",
            "vmargs": [ 
                "-Xmx512M",
                "-DprojectCode=${env:projectCode}",

there is a projectCode=x line in the .env file so I expect the command to be run to contain -DprojectCode=x instead it gives -DprojectCode= which means my tests don't run.

This happens for every single environment variable I have.

[jdneo]

Now the envFile only works inside your running tests.

${xxx:yyy} is not supported when referencing a variable defined in the envfile.

[jdneo]

@testforstephen Is this something that VS Code can handle, or we need to implement it by our own?

[testforstephen]

VS Code only supports substituting environment variables from system environment variable set. See https://code.visualstudio.com/docs/editor/variables-reference

envFile is a property contributed by Java debugger, I don't think VS Code supports reading them when replacing variables reference in launch.json.