Autoshow suggestions for jsdoc param

Fixes #34853

extensions/typescript/src/features/completionItemProvider.ts

@@ -190,13 +190,21 @@ export default class TypeScriptCompletionItemProvider implements CompletionItemP
 		}
 
 		if (context.triggerCharacter === '/') {
-			// make sure we are in something that looks line an import path
+			// make sure we are in something that looks like an import path
 			const line = document.lineAt(position.line).text.slice(0, position.character);
 			if (!line.match(/^import .+? from\s*["'][^'"]*$/) && !line.match(/\b(import|require)\(['"][^'"]*$/)) {
 				return Promise.resolve<CompletionItem[]>([]);
 			}
 		}
 
+		if (context.triggerCharacter === '@') {
+			// make sure we are in something that looks like the start of a jsdoc comment
+			const line = document.lineAt(position.line).text.slice(0, position.character);
+			if (!line.match(/^\s*\*[ ]?@/) && !line.match(/\/\*\*+[ ]?@/)) {
+				return Promise.resolve<CompletionItem[]>([]);
+			}
+		}
+
 		const args: CompletionsRequestArgs = vsPositionToTsFileLocation(file, position);
 		return this.client.execute('completions', args, token).then((msg) => {
 			// This info has to come from the tsserver. See https://github.com/Microsoft/TypeScript/issues/2831

extensions/typescript/src/typescriptMain.ts

@@ -242,7 +242,7 @@ class LanguageProvider {
 		const completionItemProvider = new (await import('./features/completionItemProvider')).default(client, this.typingsStatus);
 		completionItemProvider.updateConfiguration();
 		this.toUpdateOnConfigurationChanged.push(completionItemProvider);
-		this.disposables.push(languages.registerCompletionItemProvider(selector, completionItemProvider, '.', '"', '\'', '/'));
+		this.disposables.push(languages.registerCompletionItemProvider(selector, completionItemProvider, '.', '"', '\'', '/', '@'));
 
 		this.disposables.push(languages.registerCompletionItemProvider(selector, new (await import('./features/directiveCommentCompletionProvider')).default(client), '@'));