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feat: stabilize css.preprocessorMaxWorkers and default to true #19992

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feat: stabilize css.preprocessorMaxWorkers and default to true #19992

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7 changes: 4 additions & 3 deletions docs/config/shared-options.md
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Original file line number Diff line number Diff line change
Expand Up @@ -280,11 +280,12 @@ export default defineConfig({

## css.preprocessorMaxWorkers

- **Experimental:** [Give Feedback](https://github.com/vitejs/vite/discussions/15835)
- **Type:** `number | true`
- **Default:** `0` (does not create any workers and run in the main thread)
- **Default:** `true`

Specifies how many threads CSS preprocessors will run on. `true` means the number of CPUs minus 1. When set to `0`, Vite will not create any workers and run the preprocessors in the main thread.

If this option is set, CSS preprocessors will run in workers when possible. `true` means the number of CPUs minus 1.
Depending on the preprocessor options, Vite may run the preprocessors on the main thread even if this option is not set to `0`.

## css.devSourcemap

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6 changes: 2 additions & 4 deletions packages/vite/src/node/plugins/css.ts
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Expand Up @@ -144,8 +144,7 @@ export interface CSSOptions {
* If this option is set, preprocessors will run in workers when possible.
* `true` means the number of CPUs minus 1.
*
* @default 0
* @experimental
* @default true
*/
preprocessorMaxWorkers?: number | true
postcss?:
Expand Down Expand Up @@ -199,8 +198,7 @@ export const cssConfigDefaults = Object.freeze({
transformer: 'postcss',
// modules
// preprocessorOptions
/** @experimental */
preprocessorMaxWorkers: 0,
preprocessorMaxWorkers: true,
// postcss
/** @experimental */
devSourcemap: false,
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