Require a semicolon after augment decorator statements

common/changes/@typespec/compiler/augment-statement-semicolon_2023-08-30-12-49.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/compiler",
+      "comment": "**Breaking Change** A semicolon is now required after augment decorator  statements.",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/compiler"
+}

docs/language-basics/decorators.md

@@ -34,7 +34,7 @@ model Dog {}
 
 ## Augment decorators
 
-Decorators can also be used from a different location by referring to the type being decorated. For this you can declare an augment decorator using the `@@` prefix. The first argument of an augment decorator is the type reference that should be decorated.
+Decorators can also be used from a different location by referring to the type being decorated. For this you can declare an augment decorator using the `@@` prefix. The first argument of an augment decorator is the type reference that should be decorated. As the augment decorator is a statement, it must end with a semicolon (`;`).
 
 ```typespec
 model Dog {}

docs/language-basics/overview.md

@@ -47,7 +47,7 @@ _Details: [Decorators](./decorators.md)_
 | Use decorator with arguments | `@tag("abc")`                                                                       |
 | Declare a decorator in JS    | `export function $tag(context: DecoratorContext, target: Type, name: string) {...}` |
 | Save state in decorator      | `context.program.stateMap(key).set(target, <value>)`                                |
-| Augment decorator            | `@@tag(MyType, "abc")`                                                              |
+| Augment decorator            | `@@tag(MyType, "abc");`                                                             |
 
 ## Scalars
 

packages/compiler/src/core/parser.ts

@@ -1188,6 +1188,9 @@ function createParser(code: string | SourceFile, options: ParseOptions = {}): Pa
         ...finishNode(pos),
       };
     }
+
+    parseExpected(Token.Semicolon);
+
     return {
       kind: SyntaxKind.AugmentDecoratorStatement,
       target,

packages/compiler/test/checker/augment-decorators.test.ts

@@ -153,7 +153,7 @@ describe("compiler: checker: augment decorators", () => {
 
     it("namespace", () => expectTarget(`@test("target") namespace Foo {}`, "Foo"));
 
-    it("global namespace", () => expectTarget(`@@test(global, "target")`, "global"));
+    it("global namespace", () => expectTarget(`@@test(global, "target");`, "global"));
 
     it("model", () => expectTarget(`@test("target") model Foo {}`, "Foo"));
     it("model property", () =>
@@ -288,7 +288,7 @@ describe("compiler: checker: augment decorators", () => {
         }
 
         namespace MyService {
-          @@customName(Lib.Foo, "FooCustom")
+          @@customName(Lib.Foo, "FooCustom");
         }
       `);
       });
@@ -298,12 +298,12 @@ describe("compiler: checker: augment decorators", () => {
 
         await expectAugmentTarget(`
         import "./lib.tsp";
-        @@customName(Foo, "FooCustom")
+        @@customName(Foo, "FooCustom");
       `);
       });
 
       it("augment type in another file checked after", async () => {
-        testHost.addTypeSpecFile("lib.tsp", `@@customName(Foo, "FooCustom") `);
+        testHost.addTypeSpecFile("lib.tsp", `@@customName(Foo, "FooCustom"); `);
 
         await expectAugmentTarget(`
         import "./lib.tsp";
@@ -345,7 +345,7 @@ describe("compiler: checker: augment decorators", () => {
           @test("target") 
           @customName("Foo")
           model Foo {}
-          @@customName(Foo, "FooCustom")
+          @@customName(Foo, "FooCustom");
       `);
       });
 
@@ -354,8 +354,8 @@ describe("compiler: checker: augment decorators", () => {
           @test("target") 
           @customName("Foo")
           model Foo {}
-          @@customName(Foo, "NonCustom")
-          @@customName(Foo, "FooCustom")
+          @@customName(Foo, "NonCustom");
+          @@customName(Foo, "FooCustom");
       `);
       });
     });

packages/compiler/test/checker/enum.test.ts

@@ -164,7 +164,7 @@ describe("compiler: enums", () => {
       @test enum Base {@doc("base doc") one}
       @test enum Spread {...Base}
 
-      @@doc(Spread.one, "override for spread")
+      @@doc(Spread.one, "override for spread");
       `
     );
     const { Base, Spread } = (await testHost.compile("main.tsp")) as {

packages/compiler/test/checker/interface.test.ts

@@ -446,7 +446,7 @@ describe("compiler: interfaces", () => {
       `
       @test interface Base {@doc("base doc") one(): void}
       @test interface Extending extends Base {}
-      @@doc(Extending.one, "override for spread")
+      @@doc(Extending.one, "override for spread");
       `
     );
     const { Base, Extending } = (await testHost.compile("main.tsp")) as {

packages/compiler/test/checker/model.test.ts

@@ -404,7 +404,7 @@ describe("compiler: models", () => {
         @test model Base {@doc("base doc") one: string}
         @test model Spread {...Base}
 
-        @@doc(Spread.one, "override for spread")
+        @@doc(Spread.one, "override for spread");
         `
       );
       const { Base, Spread } = (await testHost.compile("main.tsp")) as {

packages/compiler/test/checker/operations.test.ts

@@ -64,7 +64,7 @@ describe("compiler: operations", () => {
       @test op a(@doc("base doc") one: string): void;
       @test op b is a;
 
-      @@doc(b::parameters.one, "override for b")
+      @@doc(b::parameters.one, "override for b");
       `
     );
     const { a, b } = (await testHost.compile("main.tsp")) as { a: Operation; b: Operation };
@@ -80,7 +80,7 @@ describe("compiler: operations", () => {
       @test op b is a<string>;
       @test op c is a<string>;
 
-      @@doc(b::parameters.one, "override for b")
+      @@doc(b::parameters.one, "override for b");
       `
     );
     const { b, c } = (await testHost.compile("main.tsp")) as { b: Operation; c: Operation };

packages/compiler/test/decorator-utils.test.ts

@@ -196,7 +196,7 @@ describe("compiler: decorator utils", () => {
         @bar
         model Foo {}
 
-        @@bar(Foo)
+        @@bar(Foo);
       `);
 
       expectDiagnosticEmpty(diagnostics);
@@ -293,7 +293,7 @@ describe("compiler: decorator utils", () => {
         @red
         model Foo {}
 
-        @@blue(Foo)
+        @@blue(Foo);
       `);
 
       expectDiagnostics(diagnostics, [