Exploiting Kotlin Metadata + Annotation Processing
summary
Prototype from a year earlier now powers real libraries: about a dozen annotation processors use Kotlin metadata to recover nullability, mutable vs immutable types, type aliases and sealed-class children during annotation processing. A shadowed Kotlin-compiler adapter and protobuf decoding produce an internal model that generators use to emit code that actually compiles — examples include generated “with” extensions for data classes, a Moshi integration merged upstream, and a Room bug fix that reliably preserves parameter names across modules.
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chapters (8)
- 0:00Kotlin metadata overview
- 1:23Understanding the metadata
- 4:11Metadata fields and structure
- 8:05Extracting information
- 13:14Practical applications
- 21:25JetBrains API and roadmap
- 25:44Code example demonstration
- 38:00Q&A and closing
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