parallel-typescript

This project is not maintained anymore, it was created just to show that if you run typescript in parallel sometimes it might be much faster than it is. If you have something to say, please do it in microsoft/TypeScript#30235.

IT USES THE PRIVATE COMPILER'S API SO PLEASE DON'T USE IT IN PRODUCTION. IT'S JUST A PoC!

This is a test repo of straightforward implementation of parallel compilation of TypeScript's composite projects.

It uses an idea that all independent sub-projects might be build in parallel in workers/different processes. It doesn't share state between sub-projects compilations (because it seems that compiler API doesn't support (de-)serialization of the state).

Example

Let's say you have solution with 4 projects, and dependency tree has the following structure:

   A
 /   \
B  C  D
 \ | /
   E

Here we can run in parallel compilation of B, C and D projects after E project is built. Thus you can run the following commands yourself:

tsc -b ./E

# run this ones in parallel
tsc -b ./B
tsc -b ./C
tsc -b ./D

# and run this one after all
tsc -b ./A

This is exactly what the tool does for you!

It relies that re-parsing (parsing/type-checking/etc) types from deps sub-projects and running in parallel might be faster than re-using types in the same thread/process and running compilation of all sub-projects sequentially. But I'm not sure about that (I'm looking for the project who can test it and compare the results) so we need to test it before using anywhere.