Main Differences

Purpose:

• rootDir: Specifies the root directory for source files
• baseUrl: Sets the base directory for resolving non-relative module names.

Impact on Output Structure:

• rootDir: Affects the structure of output files after compilation.
• baseUrl: Simplifies module imports but does not affect output files.

Impact on File Selection for Compilation:

• rootDir: Does not affect the selection of files for compilation.

• baseUrl: Only affects non-relative imports.(not files)

Conclusion

Thus, rootDir and baseUrl serve different purposes in TypeScript configuration. rootDir helps organize the structure of source and output files, while baseUrl simplifies working with paths when importing modules. Proper use of these parameters can significantly improve the organization of your project and simplify working with code."