CUE is an open-source Data Validation language and inference engine with its roots in logic programming.

Instead of writing code like typical languages, you provide values, types, definitions, and constraints to Cue, and it checks if what you entered is correct.

For those familiar with Rego, it's important to note that CUE and Rego are both declarative configuration languages but they have some key differences.

Overall, the choice between CUE and Rego depends on your specific use case.

If you need a general-purpose configuration language with data validation capabilities, CUE might be a better fit.

On the other hand, if your main focus is on defining and enforcing policies, Rego in combination with Open Policy Agent could be more suitable.

CUE is still evolving and things are going to change.

This repo will display examples of how CUE can be used in different scenarios.

validate dir contains the ArgoCD installation manifests in yaml format and the CUE files to validate them.

git clone https://github.com/J0hn-B/cue_demo.git && cd validate/

$ tree
    .
    |-- argocd.yml          # argocd installation
    |-- check.cue           # CUE Definitions
    `-- validate_tool.cue   # Logic and the sequence of commands to run the validation.

To validate the argocd manifests, run the following command:

cue cmd validate

Follow the instructions on terminal.