Fix weird formatting on augment decorator args

.chronus/changes/fix-formatter-decorator-op-augment-2026-04-29.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/compiler"
+---
+
+Fix formatting of decorators on operations and augment decorators. Decorators on operations now break to separate lines when the total line exceeds the print width. Augment decorator arguments are now consistently indented when the line breaks, matching TypeScript/prettier function call formatting.

.chronus/changes/fix-formatter-decorator-op-augment-java-2026-04-29.md

@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-java"
+---
+
+Reformat augment decorator arguments in test files to match updated formatter style.

packages/compiler/src/formatter/print/printer.ts

@@ -565,7 +565,7 @@ function printAugmentDecoratorArgs(
     group([
       indent(
         join(", ", [
-          path.call(print, "targetType"),
+          [softline, path.call(print, "targetType")],
           ...path.map((arg) => [softline, print(arg)], "arguments"),
         ]),
       ),

packages/compiler/test/formatter/formatter.test.ts

@@ -2483,10 +2483,24 @@ namespace Foo {
 @@doc(Foo,  "This is getting very very very long 1", "This is getting very very very long 2", "This is getting very very very long 3");
       `,
         expected: `
-@@doc(Foo,
+@@doc(
+  Foo,
   "This is getting very very very long 1",
   "This is getting very very very long 2",
   "This is getting very very very long 3"
+);
+      `,
+      });
+    });
+
+    it("break arguments per lines when decorator name is very long", async () => {
+      await assertFormat({
+        code: `
+@@Some.Very.Long.Namespace.Decorator.Some.Very.Long.Namespace.Decorator.Some.Very.Long.Namespace.Decorator(subscribe1);
+      `,
+        expected: `
+@@Some.Very.Long.Namespace.Decorator.Some.Very.Long.Namespace.Decorator.Some.Very.Long.Namespace.Decorator(
+  subscribe1
 );
       `,
       });

packages/http-client-java/generator/http-client-generator-test/tsp/external.tsp

@@ -52,14 +52,16 @@ interface ExternalOp {
   postExternal(@body body: Body): Body;
 }
 
-@@alternateType(CloudEventDataFormat,
+@@alternateType(
+  CloudEventDataFormat,
   {
     identity: "com.azure.core.models.CloudEventDataFormat",
   },
   "java"
 );
 
-@@alternateType(DayOfWeek,
+@@alternateType(
+  DayOfWeek,
   {
     identity: "java.time.DayOfWeek",
   },