Pkl: Safe and Maintainable Config for Java Apps and Infrastructure
summary
Pkl is a new declarative config language that compiles to YAML/JSON and provides real type safety: schemas via classes, type constraints (eg port > 1024), nullability and reusable templates. Language bindings generate Java/Kotlin classes so Spring startup maps PKL directly into typed objects; demos show compilation errors catching bad types and a Spring app returning the mapped config. PKL libraries cover CloudFormation and Kubernetes, a CloudFormation stack deploys via rain deploys CloudFormation from PKL, Kubernetes manifests import to Rancher, and a GitHub Actions repo replaces dozens of hand‑edited YAMLs. Open Source by Apple typed config + templating
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chapters (15)
- 0:00Introduction
- 1:07What is Pkl
- 2:11Tooling and safety
- 3:58Types and constraints
- 6:27Schemas and classes
- 8:56Nullability and comments
- 10:00Type aliases and enums
- 11:29Objects and templating
- 14:38Functions and libraries
- 19:16Pkl with Spring
- 24:34Pkl in real-world infrastructure
- 27:25CloudFormation with Pkl
- 33:52Kubernetes deployments
- 39:50GitHub Actions with Pkl
- 46:13Q&A
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