Performance

These tricks will make ts-node faster.

Skip typechecking

It is often better to typecheck as part of your tests or linting. You can run tsc --noEmit to do this. In these cases, ts-node can skip typechecking, making it much faster.

To skip typechecking in ts-node, do one of the following:

• Enable swc
  • This is by far the fastest option
• Enable transpileOnly to skip typechecking without swc

With typechecking

If you absolutely must typecheck in ts-node:

• Avoid dynamic require() which may trigger repeated typechecking; prefer import
• Try with and without --files; one may be faster depending on your project
• Check tsc --showConfig; make sure all executed files are included
• Enable skipLibCheck
• Set a types array to avoid loading unnecessary @types