Fix SFC without a script tag show an error

server/src/embeddedSupport/embeddedSupport.ts

@@ -138,6 +138,10 @@ export function getSingleTypeDocument(
     }
   }
 
+  if (type === 'script' && newContent.trim().length <= 0) {
+    newContent = 'export default {};';
+  }
+
   return TextDocument.create(document.uri, langId, document.version, newContent);
 }
 

server/src/services/typescriptService/preprocess.ts

@@ -22,7 +22,7 @@ export function parseVueScript(text: string): string {
   const doc = TextDocument.create('test://test/test.vue', 'vue', 0, text);
   const regions = getVueDocumentRegions(doc);
   const script = regions.getSingleTypeDocument('script');
-  return script.getText() || 'export default {};';
+  return script.getText();
 }
 
 function parseVueScriptSrc(text: string): string | undefined {

test/lsp/diagnostics/helper.ts

@@ -35,3 +35,15 @@ export async function testDiagnostics(docUri: vscode.Uri, expectedDiagnostics: v
     );
   }
 }
+
+export async function testNoDiagnostics(docUri: vscode.Uri) {
+  // For diagnostics to show up
+  await sleep(2000);
+
+  const result = vscode.languages.getDiagnostics(docUri);
+
+  assert.ok(
+    result.length === 0,
+    `Should find no diagnostics for ${docUri.fsPath} but found:\n` + `${JSON.stringify(result)}`
+  );
+}

test/lsp/diagnostics/simple.test.ts

@@ -0,0 +1,17 @@
+import { activateLS, sleep, showFile, FILE_LOAD_SLEEP_TIME } from '../helper';
+import { getDocUri } from '../util';
+import { testNoDiagnostics } from './helper';
+
+describe('Should find common diagnostics for all regions', () => {
+  const docUri = getDocUri('client/diagnostics/Parent.vue');
+
+  before('activate', async () => {
+    await activateLS();
+    await showFile(docUri);
+    await sleep(FILE_LOAD_SLEEP_TIME);
+  });
+
+  it('shows no diagnostics error for <script> region', async () => {
+    await testNoDiagnostics(docUri);
+  });
+});

test/lsp/fixture/client/diagnostics/Parent.vue

@@ -0,0 +1,13 @@
+<template>
+  <div></div>
+</template>
+
+<script>
+import SimpleChild from './SimpleChild.vue'
+
+export default {
+  components: {
+    SimpleChild
+  }
+}
+</script>

test/lsp/fixture/client/diagnostics/SimpleChild.vue

@@ -0,0 +1,3 @@
+<template>
+  <h1>No script tag in this component</h1>
+</template>