diff --git a/packages/playground/package.json b/packages/playground/package.json
index acf9b459764..145452a12ff 100644
--- a/packages/playground/package.json
+++ b/packages/playground/package.json
@@ -47,6 +47,7 @@
     "@typespec/rest": "~0.43.0",
     "@typespec/openapi3": "~0.43.0",
     "@typespec/openapi": "~0.43.0",
+    "@typespec/protobuf": "~0.43.0",
     "@typespec/html-program-viewer": "~0.43.0",
     "@emotion/react": "^11.10.4",
     "@vitejs/plugin-react": "~3.1.0",
diff --git a/packages/playground/samples/kiosk.tsp b/packages/playground/samples/kiosk.tsp
new file mode 100644
index 00000000000..bfe9783847c
--- /dev/null
+++ b/packages/playground/samples/kiosk.tsp
@@ -0,0 +1,101 @@
+import "@typespec/protobuf";
+
+using TypeSpec.Protobuf;
+
+@package({
+  name: "kiosk",
+})
+namespace KioskExample;
+
+@TypeSpec.Protobuf.service
+interface Display {
+  /**
+   * Create a new kiosk. This enrolls the kiosk for sign display.
+   */
+  createKiosk(...Kiosk): Kiosk;
+
+  /**
+   * List active kiosks.
+   */
+  listKiosks(...WellKnown.Empty): {
+    @field(1) kiosks: Kiosk[];
+  };
+
+  /**
+   * Get a kiosk.
+   */
+  getKiosk(@field(1) id: int32): Kiosk;
+
+  /**
+   * Delete a kiosk.
+   */
+  deleteKiosk(@field(1) id: int32): void;
+
+  /**
+   * Create a new sign.
+   */
+  createSign(...Sign): Sign;
+
+  /**
+   * List active signs.
+   */
+  listSigns(...WellKnown.Empty): {
+    @field(1) signs: Sign[];
+  };
+
+  /**
+   * Get a sign.
+   */
+  getSign(@field(1) id: int32): Sign;
+
+  /**
+   * Delete a sign.
+   */
+  deleteSign(@field(1) id: int32): void;
+
+  /**
+   * Set a sign for display on one or more kiosks
+   */
+  setSignIdForKioskIds(@field(1) kiosk_ids: int32[], @field(2) sign_id: int32): void;
+
+  /**
+   * Get the sign that should be displayed on a kiosk.
+   */
+  getSignIdForKioskId(@field(1) kiosk_id: int32): GetSignIdResponse;
+  /**
+   * Get signs that should be displayed on a kiosk. Streams.
+   */
+  @stream(StreamMode.Out)
+  getSignIdsforKioskId(@field(1) kiosk_id: int32): GetSignIdResponse;
+}
+
+model Kiosk {
+  // Output only.
+  @field(1) id?: int32;
+  // Required.
+  @field(2) name: string;
+  @field(3) size: ScreenSize;
+  @field(4) location: WellKnown.LatLng;
+  // Output only.
+  @field(5) create_time?: WellKnown.Timestamp;
+}
+
+model Sign {
+  // Output only.
+  @field(1) id?: int32;
+  // Required.
+  @field(2) name: string;
+  @field(3) text: string;
+  @field(4) image: bytes;
+  // Output only.
+  @field(5) create_time?: WellKnown.Timestamp;
+}
+
+model ScreenSize {
+  @field(1) width: int32;
+  @field(2) height: int32;
+}
+
+model GetSignIdResponse {
+  @field(1) sign_id: int32;
+}
diff --git a/packages/playground/src/build-utils/index.ts b/packages/playground/src/build-utils/index.ts
index 40ba048b6ba..d835ace746d 100644
--- a/packages/playground/src/build-utils/index.ts
+++ b/packages/playground/src/build-utils/index.ts
@@ -63,11 +63,23 @@ function playgroundManifestPlugin(config: PlaygroundConfig): Plugin {
     load(id: string) {
       if (id === `playground-manifest.js`) {
         const sampleImport = Object.values(samples)
-          .map((path, index) => `import s${index} from "${viteConfig.root}/${path}?raw"`)
+          .map(
+            (sampleValue, index) =>
+              `import s${index} from "${viteConfig.root}/${sampleValue.fileName}?raw"`
+          )
           .join("\n");
         const sampleObj = [
           "{",
-          ...Object.keys(samples).map((label, index) => `${JSON.stringify(label)}: s${index}, `),
+          ...Object.entries(samples).map(
+            ([label, config], index) =>
+              `${JSON.stringify(label)}: {
+                fileName: ${JSON.stringify(config.fileName)},
+                preferredEmitter: ${
+                  config.preferredEmitter ? JSON.stringify(config.preferredEmitter) : "undefined"
+                },
+                content: s${index}
+              }, `
+          ),
           "}",
         ].join("\n");
 
diff --git a/packages/playground/src/components/editor-command-bar.tsx b/packages/playground/src/components/editor-command-bar.tsx
index 381c29e2d76..73a61393235 100644
--- a/packages/playground/src/components/editor-command-bar.tsx
+++ b/packages/playground/src/components/editor-command-bar.tsx
@@ -1,13 +1,17 @@
 import { Link, Toolbar, ToolbarButton, Tooltip } from "@fluentui/react-components";
 import { Bug16Regular, Save16Regular } from "@fluentui/react-icons";
-import { FunctionComponent } from "react";
+import { FunctionComponent, useCallback } from "react";
+import { useSetRecoilState } from "recoil";
+import { SampleConfig } from "../index.js";
+import { PlaygroundManifest } from "../manifest.js";
+import { selectedEmitterState } from "../state.js";
 import { EmitterDropdown } from "./emitter-dropdown.js";
 import { SamplesDropdown } from "./samples-dropdown.js";
 
 export interface EditorCommandBarProps {
   documentationUrl?: string;
   saveCode: () => Promise<void> | void;
-  updateTypeSpec: (value: string) => Promise<void> | void;
+  updateTypeSpec: (value: string) => void;
   newIssue: () => Promise<void> | void;
 }
 export const EditorCommandBar: FunctionComponent<EditorCommandBarProps> = ({
@@ -23,6 +27,20 @@ export const EditorCommandBar: FunctionComponent<EditorCommandBarProps> = ({
       </Link>
     </label>
   ) : undefined;
+
+  const setEmitter = useSetRecoilState(selectedEmitterState);
+
+  const onSelectSample = useCallback(
+    (config: SampleConfig) => {
+      if (!config.content) throw new Error("Unreachable: sample has no 'content' property");
+
+      updateTypeSpec(config.content);
+
+      setEmitter(config.preferredEmitter ?? PlaygroundManifest.defaultEmitter);
+    },
+    [setEmitter, updateTypeSpec]
+  );
+
   return (
     <div css={{ borderBottom: "1px solid #f5f5f5" }}>
       <Toolbar>
@@ -34,7 +52,7 @@ export const EditorCommandBar: FunctionComponent<EditorCommandBarProps> = ({
             onClick={saveCode as any}
           />
         </Tooltip>
-        <SamplesDropdown onSelectSample={updateTypeSpec as any} />
+        <SamplesDropdown onSelectSample={onSelectSample} />
         <EmitterDropdown />
         {documentation}
         <div css={{ flex: "1" }}></div>
diff --git a/packages/playground/src/components/emitter-dropdown.tsx b/packages/playground/src/components/emitter-dropdown.tsx
index bcce23abc82..6ab413e0236 100644
--- a/packages/playground/src/components/emitter-dropdown.tsx
+++ b/packages/playground/src/components/emitter-dropdown.tsx
@@ -33,7 +33,7 @@ export const EmitterDropdown: FunctionComponent<EmitterDropdownProps> = () => {
   return (
     <Select className="sample-dropdown" onChange={handleSelected} value={selectedEmitter}>
       <option value="" disabled>
-        Select sample...
+        Select emitter...
       </option>
       {options}
     </Select>
diff --git a/packages/playground/src/components/openapi-output.tsx b/packages/playground/src/components/openapi-output.tsx
index ced3515abbd..688e452f545 100644
--- a/packages/playground/src/components/openapi-output.tsx
+++ b/packages/playground/src/components/openapi-output.tsx
@@ -12,7 +12,7 @@ export interface OpenAPIOutputProps {
 export const OpenAPIOutput: FunctionComponent<OpenAPIOutputProps> = (props) => {
   const [selected, setSelected] = useState<"raw" | "swagger-ui">("raw");
   const options = [
-    { label: "OpenAPI", value: "raw" },
+    { label: "Output Files", value: "raw" },
     { label: "Swagger UI", value: "swagger-ui" },
   ];
 
diff --git a/packages/playground/src/components/playground.tsx b/packages/playground/src/components/playground.tsx
index 72ae9e8c7b0..7d7a86e2265 100644
--- a/packages/playground/src/components/playground.tsx
+++ b/packages/playground/src/components/playground.tsx
@@ -52,6 +52,7 @@ const PlaygroundInternal: FunctionComponent<PlaygroundProps> = ({
   const doCompile = useCallback(async () => {
     const content = typespecModel.getValue();
     const typespecCompiler = await importTypeSpecCompiler();
+
     const state = await compile(host, content, selectedEmitter, emittersOptions);
     setCompilationStatus(state);
     if ("program" in state) {
@@ -81,9 +82,14 @@ const PlaygroundInternal: FunctionComponent<PlaygroundProps> = ({
   }, [updateTypeSpec]);
 
   useEffect(() => {
-    const disposable = typespecModel.onDidChangeContent(debounce(() => doCompile(), 200));
-    return () => disposable.dispose();
+    const debouncer = debounce(() => doCompile(), 200);
+    const disposable = typespecModel.onDidChangeContent(debouncer);
+    return () => {
+      debouncer.clear();
+      disposable.dispose();
+    };
   }, [typespecModel, doCompile]);
+
   useEffect(() => {
     void doCompile();
   }, [doCompile]);
diff --git a/packages/playground/src/components/samples-dropdown.tsx b/packages/playground/src/components/samples-dropdown.tsx
index 16d5bc0bfb3..bb4a37216be 100644
--- a/packages/playground/src/components/samples-dropdown.tsx
+++ b/packages/playground/src/components/samples-dropdown.tsx
@@ -1,8 +1,9 @@
 import { Select } from "@fluentui/react-components";
 import { FunctionComponent, useCallback, useEffect, useState } from "react";
+import { SampleConfig } from "../index.js";
 import { PlaygroundManifest } from "../manifest.js";
 export interface SamplesDropdownProps {
-  onSelectSample: (content: string) => void;
+  onSelectSample: (content: SampleConfig) => void;
 }
 export const SamplesDropdown: FunctionComponent<SamplesDropdownProps> = ({ onSelectSample }) => {
   const [selected, setSelected] = useState<string>("");
@@ -24,6 +25,7 @@ export const SamplesDropdown: FunctionComponent<SamplesDropdownProps> = ({ onSel
   const handleSelected = useCallback(
     (evt: any) => {
       setSelected(evt.target.value);
+
       onSelectSample(PlaygroundManifest.samples[evt.target.value]);
     },
     [onSelectSample]
diff --git a/packages/playground/src/index.ts b/packages/playground/src/index.ts
index 9c4f6f6e9e3..55ceb56e5f0 100644
--- a/packages/playground/src/index.ts
+++ b/packages/playground/src/index.ts
@@ -1,7 +1,7 @@
 export interface PlaygroundConfig {
   defaultEmitter: string;
   libraries: string[];
-  samples: Record<string, string>;
+  samples: Record<string, SampleConfig>;
   enableSwaggerUI: boolean;
   links: {
     newIssue: string;
@@ -9,5 +9,11 @@ export interface PlaygroundConfig {
   };
 }
 
+export interface SampleConfig {
+  fileName: string;
+  preferredEmitter?: string;
+  content?: string;
+}
+
 export { createBrowserHost } from "./browser-host.js";
 export { Playground, PlaygroundProps } from "./components/playground.js";
diff --git a/packages/playground/vite.config.ts b/packages/playground/vite.config.ts
index 480a41b73d6..351cdb6bdd7 100644
--- a/packages/playground/vite.config.ts
+++ b/packages/playground/vite.config.ts
@@ -10,12 +10,23 @@ const config = definePlaygroundViteConfig({
     "@typespec/openapi",
     "@typespec/versioning",
     "@typespec/openapi3",
+    "@typespec/protobuf",
   ],
   samples: {
-    "API versioning": "samples/versioning.tsp",
-    "Discriminated unions": "samples/unions.tsp",
-    "HTTP service": "samples/http.tsp",
-    "REST framework": "samples/rest.tsp",
+    "API versioning": {
+      fileName: "samples/versioning.tsp",
+      preferredEmitter: "@typespec/openapi3",
+    },
+    "Discriminated unions": {
+      fileName: "samples/unions.tsp",
+      preferredEmitter: "@typespec/openapi3",
+    },
+    "HTTP service": { fileName: "samples/http.tsp", preferredEmitter: "@typespec/openapi3" },
+    "REST framework": { fileName: "samples/rest.tsp", preferredEmitter: "@typespec/openapi3" },
+    "Protobuf Kiosk": {
+      fileName: "samples/kiosk.tsp",
+      preferredEmitter: "@typespec/protobuf",
+    },
   },
   enableSwaggerUI: true,
   links: {
diff --git a/packages/protobuf/lib/proto.tsp b/packages/protobuf/lib/proto.tsp
index bea96e092ae..59268bc4989 100644
--- a/packages/protobuf/lib/proto.tsp
+++ b/packages/protobuf/lib/proto.tsp
@@ -1,4 +1,4 @@
-import "../dist/src/proto.js";
+import "../dist/src/index.js";
 
 namespace TypeSpec.Protobuf;
 
@@ -57,6 +57,13 @@ namespace WellKnown {
    * This model references `google.protobuf.Any` from `google/protobuf/any.proto`.
    */
   model Any is Extern<"google/protobuf/any.proto", "google.protobuf.Any">;
+
+  /**
+   * A latitude and longitude.
+   *
+   * This model references `google.type.LatLng` from `google/type/latlng.proto`.
+   */
+  model LatLng is Extern<"google/type/latlng.proto", "google.type.LatLng">;
 }
 
 /**
diff --git a/packages/protobuf/package.json b/packages/protobuf/package.json
index 39fb2915f4e..2b9de3cde99 100644
--- a/packages/protobuf/package.json
+++ b/packages/protobuf/package.json
@@ -18,7 +18,7 @@
     "protobuf",
     "grpc"
   ],
-  "main": "dist/src/lib.js",
+  "main": "dist/src/index.js",
   "type": "module",
   "tspMain": "lib/proto.tsp",
   "scripts": {
diff --git a/packages/protobuf/src/index.ts b/packages/protobuf/src/index.ts
new file mode 100644
index 00000000000..0dd36fbcc21
--- /dev/null
+++ b/packages/protobuf/src/index.ts
@@ -0,0 +1,7 @@
+import { TypeSpecProtobufLibrary } from "./lib.js";
+
+export const namespace = "TypeSpec.Protobuf";
+
+export * from "./proto.js";
+
+export const $lib = TypeSpecProtobufLibrary;
diff --git a/packages/protobuf/src/lib.ts b/packages/protobuf/src/lib.ts
index bbf1d936fff..53f0ac77e39 100644
--- a/packages/protobuf/src/lib.ts
+++ b/packages/protobuf/src/lib.ts
@@ -141,8 +141,6 @@ export const TypeSpecProtobufLibrary = createTypeSpecLibrary({
 
 export const { reportDiagnostic } = TypeSpecProtobufLibrary;
 
-export { $onEmit } from "./proto.js";
-
 export type TypeSpecProtobufLibrary = typeof TypeSpecProtobufLibrary;
 
 const keys = [
diff --git a/packages/protobuf/src/proto.ts b/packages/protobuf/src/proto.ts
index 3e17d03566d..5f5669a7645 100644
--- a/packages/protobuf/src/proto.ts
+++ b/packages/protobuf/src/proto.ts
@@ -41,8 +41,8 @@ const IMPLEMENTATION_RESERVED_RANGE = [19000, 19999] as const;
 /**
  * Defined in the [ProtoBuf Language Spec](https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#identifiers).
  *
- * ident = letter { letter | decimalDigit | "_" }
- * fullIdent = ident { "." ident }
+ * ident = letter \{ letter | decimalDigit | "_" \}
+ * fullIdent = ident \{ "." ident \}
  */
 export const PROTO_FULL_IDENT = /([a-zA-Z][a-zA-Z0-9_]*)+/;
 
@@ -215,4 +215,3 @@ export async function $onValidate(program: Program) {
 }
 
 export const namespace = "TypeSpec.Protobuf";
-export { TypeSpecProtobufLibrary as $lib };
diff --git a/packages/protobuf/src/transform/index.ts b/packages/protobuf/src/transform/index.ts
index 121febbe620..25d9bbd7aab 100644
--- a/packages/protobuf/src/transform/index.ts
+++ b/packages/protobuf/src/transform/index.ts
@@ -22,7 +22,6 @@ import {
   Type,
   Union,
 } from "@typespec/compiler";
-import { EOL } from "os";
 import {
   map,
   matchType,
@@ -350,7 +349,7 @@ function tspToProto(program: Program): ProtoFile[] {
 
     if (!emptyType) {
       throw new Error(
-        `Could not resolve the empty type: ${diagnostics.map(formatDiagnostic).join(EOL)}`
+        `Could not resolve the empty type: ${diagnostics.map(formatDiagnostic).join("\n")}`
       );
     }
 
@@ -569,7 +568,7 @@ function tspToProto(program: Program): ProtoFile[] {
 
       for (const [[type, diagnostics]] of entries) {
         if (!type) {
-          const diagnosticString = diagnostics.map(formatDiagnostic).join(EOL);
+          const diagnosticString = diagnostics.map(formatDiagnostic).join("\n");
           throw new Error(
             `Failed to construct TypeSpec -> Protobuf scalar map. Unexpected failure to resolve TypeSpec scalar: ${diagnosticString}`
           );