Thanks for making this change! Just want to add a note that I was benchmarking jest locally (M1 MacBook Air with macOS 11.2.3), and noticed that find is much slower than the fs implementation because it does not exclude any files. The ignore patterns are only applied after find returns results:

https://github.com/facebook/jest/blob/c8b1835b53945412f52b37d9219a8f52d9449ff1/packages/jest-haste-map/src/crawlers/node.ts#L177-L181

In our relatively small monorepo, this results in a find execution that takes several seconds and produces a huge output (43512 lines / 6MB of text).

Ah, that's a very good point. Exclusions in find look absolutely horrible, tho 🙈

https://stackoverflow.com/a/4210072/1850276

Yep. I also understand that it may be difficult to translate to a find command because ignore() is currently a function rather than a list of glob patterns. So I wonder if using the native find is even worth it at all — but anyway I appreciate the option to disable it, otherwise it lists out every .js file inside node_modules.

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