feat(warnings): hide warnings in node_modules by default

Author: dominikg

packages/vite-plugin-svelte/src/public.d.ts

@@ -136,6 +136,9 @@ export interface SvelteConfig {
 	/**
 	 * Handles warning emitted from the Svelte compiler
 	 *
+	 * warnings emitted for files in node_modules are logged at the debug level, to see them run
+	 * `DEBUG=vite-plugin-svelte:node-modules-onwarn pnpm build`
+	 *
 	 * @example
 	 * ```
 	 * (warning, defaultHandler) => {
@@ -145,6 +148,7 @@ export interface SvelteConfig {
 	 *   }
 	 * }
 	 * ```
+	 *
 	 */
 	onwarn?: (warning: Warning, defaultHandler: (warning: Warning) => void) => void;
 	/**

packages/vite-plugin-svelte/src/utils/log.js

@@ -226,14 +226,26 @@ function buildExtraWarnings(warnings, isBuild) {
  * @param {import('svelte/compiler').Warning} w
  */
 function warnDev(w) {
-	if (log.info.enabled) log.info(buildExtendedLogMessage(w));
+	if (w.filename?.includes('node_modules')) {
+		if (isDebugNamespaceEnabled('node-modules-onwarn')) {
+			log.debug(buildExtendedLogMessage(w), undefined, 'node-modules-onwarn');
+		}
+	} else if (log.info.enabled) {
+		log.info(buildExtendedLogMessage(w));
+	}
 }
 
 /**
  * @param {import('svelte/compiler').Warning & {frame?: string}} w
  */
 function warnBuild(w) {
-	if (log.warn.enabled) log.warn(buildExtendedLogMessage(w), w.frame);
+	if (w.filename?.includes('node_modules')) {
+		if (isDebugNamespaceEnabled('node-modules-onwarn')) {
+			log.debug(buildExtendedLogMessage(w), w.frame, 'node-modules-onwarn');
+		}
+	} else if (log.warn.enabled) {
+		log.warn(buildExtendedLogMessage(w), w.frame);
+	}
 }
 
 /**