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KCL Biweekly Newsletter (2023 11.09 - 11.23) | Cloud-Native Modules, Language, and Toolchain Update Express!

· 4 min read

KCL is a constraint-based record and functional language hosted by Cloud Native Computing Foundation (CNCF) that enhances the writing of complex configurations, including those for cloud-native scenarios. With its advanced programming language technology and practices, KCL is dedicated to promoting better modularity, scalability, and stability for configurations. It enables simpler logic writing and offers ease of automation APIs and integration with homegrown systems.

This section will update the KCL language community's latest developments every two weeks, including features, website updates, and the latest community news, helping everyone better understand the KCL community!

KCL Website:


Thank you to all contributors for their outstanding work over the past two weeks (11.09 - 11.23 2023). Here is an overview of the key content:

📦 Module Update

💬 Language Update

  • Developer Experience
    • Optimized syntax indentation check for configuration code blocks, no longer enforced as an error.
    • Support for using file path wildcards as compilation entry points.
  • Bug Fixes
    • Fixed type inference errors for some scenarios involving dictionary types.
    • Fix the check of the number of schema arguments.

🔧 Toolchain Update

💻 IDE Update

  • Developer Experience
    • Support the completion of external package dependency import statements added by package management tools.
  • Bug Fixes
    • Fixed the display position of undefined type errors for function parameters.

🏄 API Update

🔥 Architecture Upgrade

  • KCL has designed and reconstructed a new semantic model, as well as APIs that support nearest symbol lookup and symbol semantic information query.
  • IDE features such as autocomplete, definition, and hover have been migrated to the new semantic model, significantly reducing the difficulty and amount of code for IDE feature development.

🚀 Performance Improvement

  • The KCL compiler supports incremental parsing of syntax and incremental checking of semantics, significantly improving the performance of KCL compilation, build, and IDE plugin usage in most scenarios by 5-10 times.

Special Thanks

The following are listed in no particular order:

Search KCL Code and Cloud-Native Models on Artifact Hub

  • Write or validate Kubernetes configurations using KCL k8s module.

  • Application delivery and and operation using the KCL Open Application Model (OAM) and the KubeVela controller.

  • Do configuration operations using KCL code libraries like jsonpatch.

In the future, we will explain the specific use cases and workflows of each module through a series of blogs. The source code for these modules is located at We welcome contributions from the community. ❤️


❤️ Thanks to all KCL users and community members for their valuable feedback and suggestions in the community. See here to join us!

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