TypeScript Strict Migration

Every TypeScript project eventually faces the same reckoning: strict mode is off, any types are everywhere, and null errors hit production weekly. Turning on strict: true produces 2,000 errors. This skill provides the systematic, incremental migration path that actually works.

What you get:

• A 10-flag migration sequence ordered from easiest to hardest
• Fix patterns for every common error type (noImplicitAny, strictNullChecks, strictPropertyInitialization, noUncheckedIndexedAccess)
• Per-directory migration strategy for large codebases using TypeScript project references
• Escape hatch tracking so temporary workarounds get cleaned up
• CI enforcement templates to prevent regression
• Baseline assessment commands to measure before/after

Works with any TypeScript 5.0+ project: React, Next.js, Node.js, Express, NestJS, Vue, Svelte, or plain TypeScript. Framework-agnostic patterns that apply everywhere.

The difference between a codebase that catches bugs at compile time and one that catches them in production is usually 3-4 compiler flags. This skill helps you enable them safely.