June 2026 monthly summary for swc-project/swc. Focused on strengthening TypeScript scope handling in the SWC React Compiler and improving diagnostic reliability. Implemented a fix to skip TypeScript 'this' pseudo-parameters during scope collection to prevent false positives related to reserved words, and added a regression test to ensure the 'this' pseudo-parameter does not trigger diagnostics. The change enhances correctness for React+TypeScript projects and reduces unrelated diagnostics in builds.

Concise monthly summary for 2025-08: Implemented Turbopack as the default in create-next-app to simplify setup and improve dev/build performance; provided a migration codemod and clarified the Turbo-to-Turbopack transition to streamline upgrades. Updated prompts and docs to guide users toward Turbopack configuration, reducing onboarding friction and maintenance costs.

July 2025 monthly summary – vercel/next.js contributions focused on codemod improvements in @next/codemod. Key features delivered include: - Documentation Update: Corrected the Codemod README URL to point to the correct location, improving user access to relevant information (commit 4c8695d2d7fb1476eaf5e90160d77534fbd25e7b). - Codemod migration support: Added a codemod to migrate deprecated experimental.turbo configurations to turbopack, including updated properties and support scaffolding for tests (commit be8275c86c776eb8f098e242f33b5f61ee8c662e). Major bugs fixed: - No major bugs fixed this month; the focus was on feature delivery and quality improvements via documentation updates and test scaffolding. Overall impact and accomplishments: - Accelerated migration path to turbopack for users upgrading from legacy experimental.turbo config, reducing manual upgrade effort and potential misconfigurations. - Improved documentation accessibility for @next/codemod, lowering onboarding friction. - Strengthened maintainability and confidence in config transformations via new test fixtures and utilities. Technologies/skills demonstrated: - Codemod development and config transformation (experimental.turbo to turbopack). - Documentation precision and user-facing content updates. - Test fixtures and tooling to support automated code transformations. - Collaboration with repository maintainers to align with Next.js upgrade paths.