fix(language-service): resolve the variable from the template context first (#35982)

PR Close #35982

packages/language-service/src/expression_diagnostics.ts

@@ -91,10 +91,8 @@ function getVarDeclarations(
       continue;
     }
     for (const variable of current.variables) {
-      let symbol = info.members.get(variable.value);
-      if (!symbol) {
-        symbol = getVariableTypeFromDirectiveContext(variable.value, info.query, current);
-      }
+      let symbol = getVariableTypeFromDirectiveContext(variable.value, info.query, current);
+
       const kind = info.query.getTypeKind(symbol);
       if (kind === BuiltinType.Any || kind === BuiltinType.Unbound) {
         // For special cases such as ngFor and ngIf, the any type is not very useful.

packages/language-service/test/project/app/parsing-cases.ts

@@ -170,6 +170,8 @@ export class TemplateReference {
   primitiveIndexType: {[name: string]: string} = {};
   anyValue: any;
   optional?: string;
+  // Use to test the `index` variable conflict between the `ngFor` and component context.
+  index = null;
   myClick(event: any) {}
   birthday = new Date();
 }