CUE vs Jsonnet: What are the differences?

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1. Syntax: CUE and Jsonnet have different syntax structures. CUE follows a JSON-like syntax, while Jsonnet is more expressive and uses a different syntax that resembles Python and is more powerful.
2. Evaluation Model: CUE uses a constraint-oriented evaluation model that allows for easier validation of configurations, while Jsonnet uses a functional evaluation model which gives more flexibility in manipulating data.
3. Extensibility: Jsonnet allows for more complex transformations and manipulations through its powerful functions and libraries, while CUE focuses more on simplicity and ease of use.
4. Type System: CUE has a sophisticated type system that enables better validation and error checking during configuration, while Jsonnet has a simpler type system that might not provide as much safety.
5. Interpolation: CUE allows for more flexible and powerful interpolation of values within configurations, making it easier to reuse and compose values, while Jsonnet's interpolation capabilities are more limited in comparison.
6. Tooling: CUE has a strong focus on tooling, providing better support for IDE integration and validation, while Jsonnet might lack some of these advanced tooling features.

In Summary, CUE and Jsonnet differ in syntax, evaluation model, extensibility, type system, interpolation capabilities, and tooling support.