typelevel/kind-projector

This system is a Scala compiler plugin that enhances type syntax by supporting anonymous type lambdas via both asterisk and underscore placeholders. It provides core functionality for parsing Scala code strings into ASTs and dynamically generating type parameter definitions. The project is built with SBT, supports cross-compilation across multiple Scala versions, and includes tooling for publishing artifacts to Sonatype.

A new \scripts/back-publish\ shell script has been added to facilitate publishing artifacts for different Scala versions. The script accepts a Git tag and a target Scala version as arguments, validates that the environment is running Java 8, and then executes an SBT command to clean, test, and publish the project for the specified version to Sonatype.

scripts · high confidence

The project has transitioned from an ad-hoc Makefile-based build process to SBT, introducing \version.sbt\ for version management and updating the README with SBT, Maven, and Mill integration instructions. A Nix-based development environment (\flake.nix\, \flake.lock\, \.envrc\) has been added to provision the build environment, and the legacy \KindProjector.scala\ implementation along with \test.scala\ have been removed, indicating a shift in how the compiler plugin is structured or maintained.

(repo-wide) · high confidence

The compiler plugin's internal structure has been reorganized to improve modularity and compatibility. A new \StringParser\ component was added to enable parsing Scala code strings into AST trees, which is now utilized by the \KindRewriter\ to dynamically generate type parameter definitions. The plugin's reporting logic was abstracted into a \ReportingCompat\ trait to handle version-specific compiler APIs, and the plugin configuration file was moved to the standard \src/main/resources\ directory.

src/main · high confidence

Added a comprehensive set of tests in the \src/test/scala/underscores\ directory to verify the plugin's support for using the underscore symbol (\\\) as a placeholder for anonymous type lambdas, mirroring the existing tests that use the asterisk (\\\) syntax. These tests cover higher-kinded types, variance annotations, nested contexts, and Java wildcard handling to ensure the underscore syntax functions correctly across various scenarios.

src/test · high confidence

The build system has transitioned from an ad-hoc Makefile to SBT, enabling cross-compilation for Scala versions 2.11.12 through 2.13.18. This change also updates the publication target to Sonatype Central and configures the project to use specific parser and reporting source directories based on the Scala version.

(dependencies) · high confidence

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

• CAI 51 → 51 (+0.0)
• Rubric changed (rubric-2026.09.8 → rubric-2026.09.16) — scores are not directly comparable.

• Code Health 94 → 94 (+0.0)
• Architecture 69 → 69 (+0.0)
• Maturity 53 → 53 (+0.0)
• Readiness 38 → 38 (+0.0)
• Security 65 → 65 (+0.0)

• Documentation: no installation or build instructions (README.md)
• Documentation: no usage examples (README.md)

• 2 commits — 2 feature/other, 0 fixes

• (repo) — 1 commit
• (root) — 1 commit

• change: Merge pull request #331 from typelevel/update/flake-lock
• change: flake.lock: Update

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

typelevel/kind-projector was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point a surveyor at a repository you know and see whether you agree with it.