ESLint performance

[MunifTanjim]

For a large project I've been working on, ESLint with null-ls constantly times out (default 5000). If I increased that to 20000, the diagnostic items eventually shows up. But when the file changes it again takes a long time to refresh them.

But for the same project, ESLint with coc-eslint feels instantaneous. If I change something, the diagnostic items changes almost immediately.

I'm not sure how to measure or benchmark it correctly. How can I help to debug and fix this?

[bpinto]

coc-eslint uses a eslint_d like process to run. Have you tried that builtin?

[jose-elias-alvarez]

That's right – eslint via null-ls will only run as fast as eslint itself runs from the command line (which is absolutely miserable on anything but small projects). VS Code and coc-eslint use the ESLint Node API to run it like a language server, which vastly increases speed.

eslint_d is one potential solution, and the ESLint language server is also very good.

[MunifTanjim]

Ah, thanks! Got it.