Second

Analyzes project dependency graphs and automatically generates code migrations when upgrading library versions. Uses abstract syntax tree (AST) parsing to identify breaking API changes, deprecated function calls, and signature modifications across multiple languages, then applies targeted refactoring rules to update call sites, imports, and configuration files without manual intervention.

Orchestrates complex, multi-step framework upgrades (e.g., React 17→18, Next.js 12→13, Django 3→4) by coordinating changes across interdependent files, configuration files, and transitive dependencies. Manages upgrade sequencing, handles cascading changes where one file's update triggers requirements in others, and validates consistency across the entire upgrade path.

Applies language-specific transformation rules to modernize code patterns, enforce style standards, or adapt to new language features. Uses pattern matching and code rewriting engines to identify outdated idioms (e.g., var→const, callback→async-await, string concatenation→template literals) and automatically rewrite them while preserving semantics and comments.

Automatically migrates configuration files (JSON, YAML, TOML, etc.) when their schemas change due to library or framework updates. Handles nested structure transformations, renames deprecated keys, applies default values for new required fields, and validates the output against the new schema specification.

Scans an entire codebase to identify all usages of deprecated APIs, breaking changes, and compatibility issues before executing migrations. Generates detailed impact reports showing which files are affected, how many changes are needed, and potential risks or manual review requirements, enabling informed decision-making about upgrade feasibility.

Automatically generates or adapts test cases to validate that migrations preserve application behavior. Runs tests before and after migration to detect regressions, generates new tests for migrated code patterns, and provides detailed reports on test coverage of migrated code to ensure confidence in the changes.

Enables phased migrations by applying changes to selected files or modules first, validating them, and then progressively rolling out to the rest of the codebase. Maintains rollback capability at each stage, allowing teams to revert to previous versions if issues are discovered, and tracks migration state across multiple sessions.

Handles migrations in polyglot codebases where multiple languages are used (e.g., TypeScript frontend, Python backend, Go services). Understands cross-language dependencies and API contracts, ensuring that when a backend API changes, corresponding frontend code is updated to match, and vice versa.