A future TypeScript 6.0 is expected to be a disruptive major release. This article walks through every anticipated breaking tsconfig change, demonstrates the real-world errors developers will encounter, and provides a step-by-step migration guide.

How to Migrate Your tsconfig for TypeScript 6.0

Audit your current tsconfig by running tsc --showConfig to capture all resolved settings.

Remove all deleted and deprecated compiler options such as out and suppressImplicitAnyIndexErrors .

Set strict: true explicitly, or strict: false with individual flags enabled incrementally.

Specify module , moduleResolution , and target explicitly to avoid new inference defaults.

Run tsc --noEmit and triage errors by category, starting with noImplicitAny .

Fix strict null checks and property initialization errors using null guards or constructor injection.

Update shared base tsconfig packages and CI pipeline version pins to 6.0-compatible versions.

Clean up temporary @ts-expect-error comments as permanent fixes are…