fix(language-core): generate script separator on demand

packages/language-core/lib/codegen/script/index.ts

@@ -60,10 +60,10 @@ function* generateWorker(
 			const { expression: options } = componentOptions ?? exportDefault;
 			yield* generateSfcBlockSection(script, 0, options.start, codeFeatures.all);
 			yield exportExpression;
-			yield* generateSfcBlockSection(script, options.end, script.content.length, codeFeatures.all, true);
+			yield* generateSfcBlockSection(script, options.end, script.content.length, codeFeatures.all);
 		}
 		else {
-			yield* generateSfcBlockSection(script, 0, script.content.length, codeFeatures.all, true);
+			yield* generateSfcBlockSection(script, 0, script.content.length, codeFeatures.all);
 			yield `export default ${exportExpression}${endOfLine}`;
 		}
 
@@ -160,7 +160,7 @@ function* generateWorker(
 				});
 			}
 
-			yield* generateSfcBlockSection(script, 0, exportDefault.start, codeFeatures.all, true);
+			yield* generateSfcBlockSection(script, 0, exportDefault.start, codeFeatures.all);
 			yield* generateExportDeclareEqual(script);
 			if (wrapLeft) {
 				yield wrapLeft;
@@ -176,7 +176,7 @@ function* generateWorker(
 			yield* generateSfcBlockSection(script, expression.end, script.content.length, codeFeatures.all);
 		}
 		else {
-			yield* generateSfcBlockSection(script, 0, script.content.length, codeFeatures.all, true);
+			yield* generateSfcBlockSection(script, 0, script.content.length, codeFeatures.all);
 			yield* generateExportDeclareEqual(script);
 			yield `(await import('${vueCompilerOptions.lib}')).defineComponent({})${endOfLine}`;
 			yield* generateTemplate(options, ctx);

packages/language-core/lib/codegen/script/scriptSetup.ts

@@ -274,8 +274,7 @@ export function* generateSetupFunction(
 		Math.max(scriptSetupRanges.importSectionEndOffset, scriptSetupRanges.leadingCommentEndOffset),
 		scriptSetup.content.length,
 		transforms,
-		(start, end) =>
-			generateSfcBlockSection(scriptSetup, start, end, codeFeatures.all, end === scriptSetup.content.length),
+		(start, end) => generateSfcBlockSection(scriptSetup, start, end, codeFeatures.all),
 	);
 	yield* generateMacros(options);
 	yield* generateModels(scriptSetup, scriptSetupRanges);

packages/language-core/lib/codegen/utils/index.ts

@@ -1,5 +1,5 @@
 import type * as ts from 'typescript';
-import type { Code, SfcBlock, VueCodeInformation } from '../../types';
+import type { Code, Sfc, SfcBlock, VueCodeInformation } from '../../types';
 import { codeFeatures } from '../codeFeatures';
 
 export const newLine = `\n`;
@@ -35,23 +35,25 @@ export function getTypeScriptAST(ts: typeof import('typescript'), block: SfcBloc
 }
 
 export function* generateSfcBlockSection(
-	block: SfcBlock,
+	block: NonNullable<Sfc['script' | 'scriptSetup']>,
 	start: number,
 	end: number,
 	features: VueCodeInformation,
-	partiallyEnd = false,
 ): Generator<Code> {
-	yield [
-		block.content.slice(start, end),
-		block.name,
-		start,
-		features,
-	];
+	const text = block.content.slice(start, end);
+	yield [text, block.name, start, features];
+
 	// #3632
-	if (partiallyEnd) {
-		yield `;`;
-		yield ['', block.name, end, codeFeatures.verification];
-		yield newLine;
+	if ('parseDiagnostics' in block.ast) {
+		const emptyEndLength = text.length - text.trimEnd().length;
+		for (const diag of block.ast.parseDiagnostics as ts.DiagnosticWithLocation[]) {
+			if (diag.start >= end - emptyEndLength) {
+				yield `;`;
+				yield ['', block.name, end, codeFeatures.verification];
+				yield newLine;
+				break;
+			}
+		}
 	}
 }