What problems have you encountered when working with TypeScript?

Distribution of types in complex data structures.

The need to rewrite existing JavaScript code in TypeScript.

Features of working with external libraries without ready-made .d.ts type declaration files, requiring custom declarations.

Compilation delays in large projects.

Sometimes excessive strict typing for simple tasks.

Difficulties with union types and intersection types in non-trivial scenarios.

TypeScript version compatibility with other build tools and linters.