feat: Add meta.language and meta.dialects to RuleDefinition (#156)

Author: nzakas

packages/core/src/types.ts

@@ -186,6 +186,16 @@ export interface RulesMeta<
 	 * Indicates if the rule may provide suggestions.
 	 */
 	hasSuggestions?: boolean | undefined;
+
+	/**
+	 * The language the rule is intended to lint.
+	 */
+	language?: string;
+
+	/**
+	 * The dialects of `language` that the rule is intended to lint.
+	 */
+	dialects?: string[];
 }
 
 /**

packages/core/tests/types/types.test.ts

@@ -236,6 +236,8 @@ const testRule: RuleDefinition<{
 			badFoo: "change this foo",
 			wrongBar: "fix this bar",
 		},
+		language: "javascript",
+		dialects: ["javascript", "typescript"],
 	},
 
 	create(context: TestRuleContext): TestRuleVisitor {