Posts tagged “breaking changes”

TypeScript 6.0 marks the final JavaScript-based release with strict defaults, ES5 removal, and breaking tsconfig changes. Here's what breaks and how to fix it.

A detailed account of migrating 200,000 lines from TypeScript 5.x to 6.0, covering the three breaking changes that generated thousands of errors, the migration strategy that failed first, and the tooling that ultimately saved the project.

TypeScript 6.0 ships with strict mode enabled by default, drops ES5 support, and changes module resolution. Here's how to migrate production codebases without breaking CI pipelines.