eslint
diff --git a/‎lib/types/index.d.ts‎
Lines changed: 2 additions & 0 deletions b/‎lib/types/index.d.ts‎
Lines changed: 2 additions & 0 deletions
diff --git a/‎tests/lib/types/types.test.ts‎
Lines changed: 19 additions & 0 deletions b/‎tests/lib/types/types.test.ts‎
Lines changed: 19 additions & 0 deletions
@@ -2259,6 +2259,8 @@ export namespace RuleTester {
 		only?: boolean;
 		languageOptions?: Linter.LanguageOptions | undefined;
 		settings?: { [name: string]: any } | undefined;
+		before?: () => void;
+		after?: () => void;
 	}
 
 	interface SuggestionOutput {
 
@@ -1924,6 +1924,15 @@ ruleTester.run("my-rule", rule, {
 		{ code: "foo", filename: "test.js" },
 		{ code: "foo", languageOptions: { globals: { foo: true } } },
 		{ code: "foo", settings: { foo: true } },
+		{
+			code: "foo",
+			before() {
+				/* do something */
+			},
+			after() {
+				/* undo something */
+			},
+		},
 		RuleTester.only("foo"),
 	],
 
@@ -1954,6 +1963,12 @@ ruleTester.run("my-rule", rule, {
 			],
 		},
 		{ code: "foo", errors: 1, only: true },
+		{
+			code: "foo",
+			errors: [{ messageId: "bar" }],
+			before: () => {},
+			after: () => {},
+		},
 		// @ts-expect-error // `message` cannot be `undefined`
 		{ code: "foo", errors: [{ message: undefined }], only: true },
 		// @ts-expect-error // `messageId` cannot be `undefined`
@@ -1972,6 +1987,10 @@ ruleTester.run("my-rule", rule, {
 				},
 			],
 		},
+		// @ts-expect-error // `before` should be a function
+		{ code: "foo", errors: [{ messageId: "bar" }], before: {} },
+		// @ts-expect-error // `after` should be a function
+		{ code: "foo", errors: [{ messageId: "bar" }], after: void 0 },
 	],
 });
Original file line number	Diff line number	Diff line change
`@@ -2259,6 +2259,8 @@ export namespace RuleTester {`
`2259`	`2259`	`only?: boolean;`
`2260`	`2260`	`languageOptions?: Linter.LanguageOptions \| undefined;`
`2261`	`2261`	`settings?: { [name: string]: any } \| undefined;`
	`2262`	`+ before?: () => void;`
	`2263`	`+ after?: () => void;`
`2262`	`2264`	`}`
`2263`	`2265`
`2264`	`2266`	`interface SuggestionOutput {`