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docs: add Performance FAQ about slow TypeScript types #9429

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13 changes: 13 additions & 0 deletions docs/troubleshooting/typed-linting/Performance.mdx
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Expand Up @@ -11,6 +11,19 @@ As mentioned in the [type-aware linting doc](../../getting-started/Typed_Linting

If you're experiencing times much slower than that, then there are a few common culprits.

## Slow TypeScript Types

Running typed linting on a project is generally as slow as type checking that same project.
If TypeScript's type checker runs slowly on your project, then typed linting will as well.

The [TypeScript Wiki's Performance page](https://github.com/microsoft/TypeScript/wiki/Performance) includes general performance tips and steps to investigate slow type checking.
In particular for typed linting:

- [Investigating Issues](https://github.com/microsoft/TypeScript/wiki/Performance#investigating-issues) can spot slow types and type checking:
- [Running `tsc` alone](https://github.com/microsoft/TypeScript/wiki/Performance#running-tsc-alone) should provide a baseline for your full project's type checking speed.
- [Performance Tracing](https://github.com/microsoft/TypeScript/wiki/Performance#performance-tracing) can spotlight specific slow types within your project.
- [Using Project References](https://github.com/microsoft/TypeScript/wiki/Performance#using-project-references) -which requires enabling the [new "project service" (`parserOptions.projectService`) in v8](/blog/announcing-typescript-eslint-v8-beta#project-service)- can be helpful to speed up type checking on larger projects.

## Wide includes in your `tsconfig`

When using type-aware linting, you provide us with one or more tsconfigs.
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