feat: support warningFilter in valid-compile rule

Author: baseballyama

.changeset/great-turkeys-hang.md

@@ -0,0 +1,5 @@
+---
+'eslint-plugin-svelte': minor
+---
+
+feat: support `warningFilter` in `valid-compile` rule

packages/eslint-plugin-svelte/src/rules/valid-compile.ts

@@ -27,16 +27,22 @@ export default createRule('valid-compile', {
 		if (!sourceCode.parserServices.isSvelte) {
 			return {};
 		}
-		const onwarn = sourceCode.parserServices.svelteParseContext?.svelteConfig?.onwarn;
+		const { onwarn, warningFilter } =
+			sourceCode.parserServices.svelteParseContext?.svelteConfig ?? {};
 
-		const transform: (warning: Warning) => Warning | null = onwarn
+		const transform: (warning: Warning) => Warning | null = warningFilter
 			? (warning) => {
 					if (!warning.code) return warning;
-					let result: Warning | null = null;
-					onwarn(warning, (reportWarn) => (result = reportWarn));
-					return result;
+					return warningFilter(warning) ? warning : null;
 				}
-			: (warning) => warning;
+			: onwarn
+				? (warning) => {
+						if (!warning.code) return warning;
+						let result: Warning | null = null;
+						onwarn(warning, (reportWarn) => (result = reportWarn));
+						return result;
+					}
+				: (warning) => warning;
 
 		const ignoreWarnings = Boolean(context.options[0]?.ignoreWarnings);
 

packages/eslint-plugin-svelte/tests/fixtures/rules/valid-compile/invalid/svelte-config-ignore/_config.cjs renamed to packages/eslint-plugin-svelte/tests/fixtures/rules/valid-compile/invalid/svelte-config-onwarn/_config.cjs

@@ -0,0 +1,16 @@
+/**
+ * @typedef {import("svelte/compiler").Warning} Warning
+ */
+module.exports = {
+	languageOptions: {
+		parserOptions: {
+			svelteConfig: {
+				warningFilter: (warning) => {
+					return (
+						warning.code !== 'a11y_missing_attribute' && warning.code !== 'a11y-missing-attribute'
+					);
+				}
+			}
+		}
+	}
+};