[lukehoban]

Agreed that YAML (and JSON) can be difficult to manage at large scale. This is actually a big part of why Pulumi ESC exists, to be able to decompose large YAML/JSON configuration files into smaller logical and composable units.

As you note, intellisense and error squiggles can also help a lot here - both for ensuring references to other environments are correct, and to get checking for your dynamic secrets providers. We’ve added the Monaco editor (from VS Code) into the Pulumi Cloud console to make it easier to offer these features in the very near future.

We also offer a preview pane to make it easy to play interactively validate your environments documents while working on them directly in the console.

Lots more coming for providing an even richer experience working with environments in Pulumi ESC.