Fix comments for method signature (#18287)

src/language-js/comments/handle-comments.js

@@ -931,6 +931,7 @@ function handleVariableDeclaratorComments({
 function handleTSFunctionTrailingComments({
   comment,
   enclosingNode,
+  precedingNode,
   followingNode,
   text,
 }) {
@@ -939,6 +940,7 @@ function handleTSFunctionTrailingComments({
     (enclosingNode?.type === "TSMethodSignature" ||
       enclosingNode?.type === "TSDeclareFunction" ||
       enclosingNode?.type === "TSAbstractMethodDefinition") &&
+    (!precedingNode || precedingNode !== enclosingNode.returnType) &&
     getNextNonSpaceNonCommentCharacter(text, locEnd(comment)) === ";"
   ) {
     addTrailingComment(enclosingNode, comment);

tests/format/typescript/interface2/comments-ts-only/18278.ts

@@ -0,0 +1,23 @@
+interface a {
+  bar():any /* bat */;
+}
+
+type b = {
+  bar():any /* bat */;
+}
+
+declare class c {
+  bar():any /* bat */;
+}
+
+// https://github.com/babel/babel/blob/c92c4919771105140015167f25f7bacac77c90d9/scripts/babel-plugin-bit-decorator/types.d.ts#L28-L37
+export type BitDecorator<T> = BitDecoratorCall<T> & {
+  (assertMask: number): BitDecoratorCall<T>;
+
+  storage(
+    value: unknown,
+    context: ClassFieldDecoratorContext<T, number>
+  ): void /*{
+    context.metadata.bitsStorage = context.access;
+  }*/;
+};

tests/format/typescript/interface2/comments-ts-only/__snapshots__/format.test.js.snap

@@ -0,0 +1,59 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`18278.ts format 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+interface a {
+  bar():any /* bat */;
+}
+
+type b = {
+  bar():any /* bat */;
+}
+
+declare class c {
+  bar():any /* bat */;
+}
+
+// https://github.com/babel/babel/blob/c92c4919771105140015167f25f7bacac77c90d9/scripts/babel-plugin-bit-decorator/types.d.ts#L28-L37
+export type BitDecorator<T> = BitDecoratorCall<T> & {
+  (assertMask: number): BitDecoratorCall<T>;
+
+  storage(
+    value: unknown,
+    context: ClassFieldDecoratorContext<T, number>
+  ): void /*{
+    context.metadata.bitsStorage = context.access;
+  }*/;
+};
+
+=====================================output=====================================
+interface a {
+  bar(): any /* bat */;
+}
+
+type b = {
+  bar(): any /* bat */;
+};
+
+declare class c {
+  bar(): any /* bat */;
+}
+
+// https://github.com/babel/babel/blob/c92c4919771105140015167f25f7bacac77c90d9/scripts/babel-plugin-bit-decorator/types.d.ts#L28-L37
+export type BitDecorator<T> = BitDecoratorCall<T> & {
+  (assertMask: number): BitDecoratorCall<T>;
+
+  storage(
+    value: unknown,
+    context: ClassFieldDecoratorContext<T, number>,
+  ): void /*{
+    context.metadata.bitsStorage = context.access;
+  }*/;
+};
+
+================================================================================
+`;

tests/format/typescript/interface2/comments-ts-only/format.test.js

@@ -0,0 +1 @@
+runFormatTest(import.meta, ["typescript"]);