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Controlled Dependency Upgrades

When to Use

Use when planning or implementing any dependency update, framework bump, SDK migration, or lockfile refresh.

Core Discipline: Separate Upgrade Mechanics from General Refactoring

• Tight Variable Control: Upgrade one logical package—or one coupled package family (@angular/*, symfony/*, @prisma/client + prisma, vite + @vitejs/*)—at a time. Never run a blanket upgrade across unrelated dependencies.
• Boundary with Structural Refactoring: Implement the exact code, type, and configuration adaptations required by the new version contract. Keep structural refactoring or feature changes out of the upgrade diff.

Step-by-Step Execution Workflow

1. Group Coupled Packages Coherently

• Identify sibling packages sharing an internal version contract:
  • Core library + official plugins/adapters (eslint + @typescript-eslint/*, vitest + @vitest/*, next + eslint-config-next, laravel/framework + first-party laravel/*, pydantic + pydantic-settings, tokio + tokio-util).
  • Runtime package + matching @types/* package (or remove @types/<pkg> when the upgraded version ships built-in .d.ts declarations).
• Align versions across workspace manifests in monorepos so a single upgrade does not split the internal graph.

2. Update Manifests & Regenerate Lockfile with the Native Tool

• Edit version ranges deliberately, preserving the project's convention (^, ~, exact pin, or workspace catalog).
• Use the repository's exact package manager to update only the targeted subgraph:
  • Never delete the entire lockfile (rm package-lock.json / rm pnpm-lock.yaml / rm composer.lock) as a generic fix—doing so silently moves hundreds of unrelated transitive packages.
  • Never pass --force, --legacy-peer-deps, or --ignore-platform-reqs to mask a conflict without diagnosing the root incompatibility.

3. Adapt Call Sites, Configurations, and Types

• Search the repository for all static/dynamic imports, DI tokens, config files, and CLI invocations of the upgraded package.
• Migrate removed or deprecated APIs to the upstream-recommended replacement:
  • Update function signatures, option keys, async/Promise handling, error boundaries, and build/linter/ORM/CI runtime configs.
  • Fix new TypeScript, PHPStan, Mypy, or Rust compiler errors properly—never suppress upgrade errors with @ts-ignore, any, @phpstan-ignore, or # type: ignore.

4. Manage Temporary Overrides, Shims & Patches Explicitly

• When a lagging transitive dependency requires a temporary overrides / resolutions pin or a thin compatibility adapter, keep it minimal and scoped to the specific parent package, and document the upstream blocker plus the exact removal condition (e.g., "Remove once pkg-x >= 3.2.0 ships").
• Never hand-edit node_modules/, vendor/, or .venv/; use tracked patch tooling (pnpm patch, patch-package, composer-patches, [patch.crates-io]) when a vendor patch is unavoidable.

5. Update Tests Only for Documented Contract Changes

• Distinguish between tests failing due to an intentional upstream contract change (update test assertions/mocks to match the documented new behavior) vs. an actual application regression (fix the application integration code). Never run --updateSnapshot (-u) without reviewing every diff line.