is there a way to debug the Pulumi.config() loading process? I am getting an error with undefined config values and I think it's looking at the wrong file/keys

You can put

console.log

(or equivalent for other languages) in your own files or even in the locally venored definitions of the core

@pulumi/pulumi

libraries in your

node_modules

. Alternatively - for non-Node.js languages - you can attach a debugger using the steps in https://github.com/pulumi/pulumi/issues/1372#issuecomment-583086422, though it's currently a little bit of manual effort (we are hoping to make this push-button soon).