feat(vscode): close HTML tags as they are typed in .wrn files

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/language-server/src/server.ts

@@ -24,6 +24,7 @@ import {
   htmlFoldingRanges,
   htmlHover,
   htmlLinkedEditingRanges,
+  htmlTagComplete,
   mergeCompletions,
 } from "./html-service.ts";
 import { clearHtmlRegionCache } from "./html-regions.ts";
@@ -242,6 +243,11 @@ async function handle(message: JsonRpc): Promise<void> {
       result(message.id, ranges ? { ranges } : null);
       break;
     }
+    case "wrn/tagComplete": {
+      const document = documents.get(params.textDocument.uri);
+      result(message.id, document ? htmlTagComplete(document, params.position) : null);
+      break;
+    }
     case "textDocument/definition": {
       const document = documents.get(params.textDocument.uri);
       result(message.id, document ? definitionLocation(document, params.position) : null);

packages/language-server/test/language-server.test.ts

@@ -371,3 +371,53 @@ test("advertises and serves folding ranges and linked editing ranges over the wi
   process.kill();
   await process.exited;
 });
+
+test("serves wrn/tagComplete over the wire", async () => {
+  const process = Bun.spawn(
+    ["bun", "run", fileURLToPath(new URL("../src/server.ts", import.meta.url))],
+    { stdin: "pipe", stdout: "pipe", stderr: "pipe" },
+  );
+  const uri = "file:///tag-complete.wrn";
+  const text = `page A {
+  view {
+    <div>
+  }
+}
+`;
+  const reader = process.stdout.getReader();
+  let output = "";
+  async function readUntil(marker: string): Promise<void> {
+    while (!output.includes(marker)) {
+      const chunk = await reader.read();
+      if (chunk.done) break;
+      output += new TextDecoder().decode(chunk.value);
+    }
+  }
+
+  process.stdin.write(packet({ jsonrpc: "2.0", id: 1, method: "initialize", params: {} }));
+  await process.stdin.flush();
+  await readUntil('"id":1');
+
+  process.stdin.write(
+    packet({
+      jsonrpc: "2.0",
+      method: "textDocument/didOpen",
+      params: { textDocument: { uri, version: 1, text } },
+    }),
+  );
+  process.stdin.write(
+    packet({
+      jsonrpc: "2.0",
+      id: 2,
+      method: "wrn/tagComplete",
+      params: { textDocument: { uri }, position: { line: 2, character: 9 } },
+    }),
+  );
+  await process.stdin.flush();
+  await readUntil('"id":2');
+  const reply = output.slice(output.indexOf('"id":2'));
+  expect(reply).toContain('"result":"$0</div>"');
+
+  process.kill();
+  await process.exited;
+});