
Aleksandr Shefer contributed to the JetBrains/kotlin and google/kotlin repositories by advancing Kotlin’s WebAssembly (Wasm) backend and improving JavaScript interop. Over three months, he developed features such as Wasm-specific export safety, nativeInvoke annotation support, and br_table optimizations for Char and Short types. His work involved code analysis, annotation processing, and compiler development in both Java and Kotlin, focusing on artifact hygiene and cross-language interoperability. Aleksandr refactored common checker logic for maintainability, expanded test coverage for Wasm interop scenarios, and introduced deprecation paths for evolving APIs, demonstrating a deep, systematic approach to stabilizing and extending Kotlin’s Wasm capabilities.
October 2025 monthly summary focused on advancing Kotlin's Wasm JS interop and stabilizing the nativeInvoke annotation lifecycle. Key refactor moved nativeInvoke to a reusable module, introduced a deprecation path while the stable design is developed, and expanded end-to-end test coverage to validate interop behavior (including the KT-79937 case). Test environment adjustments ensured compilation with opt-in usage suppression where needed, and CI/test suites were aligned for reliability.
October 2025 monthly summary focused on advancing Kotlin's Wasm JS interop and stabilizing the nativeInvoke annotation lifecycle. Key refactor moved nativeInvoke to a reusable module, introduced a deprecation path while the stable design is developed, and expanded end-to-end test coverage to validate interop behavior (including the KT-79937 case). Test environment adjustments ensured compilation with opt-in usage suppression where needed, and CI/test suites were aligned for reliability.
September 2025 performance summary: Delivered cross-target Wasm quality improvements and backend optimizations across JetBrains/kotlin and google/kotlin. Key features and refactors enhanced maintainability and correctness, while targeted tests improved Wasm interoperation reliability. The work reduces interop-related issues, streamlines Wasm code generation, and strengthens compiler infrastructure for Wasm targets.
September 2025 performance summary: Delivered cross-target Wasm quality improvements and backend optimizations across JetBrains/kotlin and google/kotlin. Key features and refactors enhanced maintainability and correctness, while targeted tests improved Wasm interoperation reliability. The work reduces interop-related issues, streamlines Wasm code generation, and strengthens compiler infrastructure for Wasm targets.
August 2025 monthly summary: Focused on stabilizing Kotlin/Wasm artifacts and expanding interop capabilities across Google Kotlin and JetBrains Kotlin repos. Delivered Wasm-specific export safety and improved artifact hygiene, enabling safer cross-language interop and cleaner build outputs.
August 2025 monthly summary: Focused on stabilizing Kotlin/Wasm artifacts and expanding interop capabilities across Google Kotlin and JetBrains Kotlin repos. Delivered Wasm-specific export safety and improved artifact hygiene, enabling safer cross-language interop and cleaner build outputs.

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