If you don’t need the extra features tsdown offers(like shims or dual formats...) then tsdown essentially just transpiles TypeScript. By the way, tsdown also automatically adds file extensions (e.g., `.js`) to import statements.
Additionally, tsdown is faster than tsc. For example, in the tsdown repository:
- tsdown: 354.54ms
- tsc: 834.87ms
For larger projects, this performance gap will be even more significant.