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perf(@angular-devkit/build-angular): only create one instance of postcss when needed #26391

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merged 1 commit into from
Nov 21, 2023
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perf(@angular-devkit/build-angular): only create one instance of postcss when needed #26391

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20 changes: 15 additions & 5 deletions ...s/angular_devkit/build_angular/src/tools/esbuild/stylesheets/stylesheet-plugin-factory.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,11 @@ export interface StylesheetLanguage {
): OnLoadResult | Promise<OnLoadResult>;
}

/**
* Cached postcss instances that can be re-used between various StylesheetPluginFactory instances.
*/
const postcssProcessor = new Map<string, WeakRef<import('postcss').Processor>>();

export class StylesheetPluginFactory {
private postcssProcessor?: import('postcss').Processor;

Expand All @@ -94,11 +99,16 @@ export class StylesheetPluginFactory {
}

if (options.tailwindConfiguration) {
postcss ??= (await import('postcss')).default;
const tailwind = await import(options.tailwindConfiguration.package);
this.postcssProcessor = postcss().use(
tailwind.default({ config: options.tailwindConfiguration.file }),
);
const { package: tailwindPackage, file: config } = options.tailwindConfiguration;
const postCssInstanceKey = tailwindPackage + ':' + config;
this.postcssProcessor = postcssProcessor.get(postCssInstanceKey)?.deref();

if (!this.postcssProcessor) {
postcss ??= (await import('postcss')).default;
const tailwind = await import(tailwindPackage);
this.postcssProcessor = postcss().use(tailwind.default({ config }));
postcssProcessor.set(postCssInstanceKey, new WeakRef(this.postcssProcessor));
}
}

return this.postcssProcessor;
Expand Down