1.2.1

New

• [IR] Add support for generating metadata-visible classes entirely in IR, allowing Metro to move much of its current FIR code gen entirely to IR.
  • This is enabled by default (and only possible) on Kotlin 2.4.20-dev-6138 or newer and can be configured via the generateClassesInIr option. Do not try to enable this on older versions, your builds will fail and you will be sad.

Fixes

• [FIR] Fix supertype merging not accounting for replaces coming from binding container contributions.

Changes

• Test Kotlin 2.4.20-dev-6138.
• Test IntelliJ 2026.2 EAPs.

Contributors

Special thanks to the following contributors for contributing to this release!

• @hossain-khan
• @kevinguitar

Consider sponsoring Metro's development

What's Changed

• Update metro bootstrap by @ZacSweers in #2428
• Add play sdk verification by @ZacSweers in #2429
• Kotlin 2.4.20-dev-6138 compat by @ZacSweers in #2407
• minor: update dokka generate command for agents by @hossain-khan in #2432
• Fix supertype merging not handling replaces from containers by @kevinguitar in #2434

Full Changelog: 1.2.0...1.2.1