refactor(compiler-cli): move getDiagnosticsForComponent to compiler (…

…#43134)

Change the language service to call `getDiagnosticsForComponent` from
the compiler instead of the `TemplateTypeChecker`.

Refs #42966

PR Close #43134

packages/compiler-cli/src/ngtsc/core/src/compiler.ts

@@ -459,6 +459,15 @@ export class NgCompiler {
     return this.addMessageTextDetails(diagnostics);
   }
 
+  /**
+   * Get all `ts.Diagnostic`s currently available that pertain to the given component.
+   */
+  getDiagnosticsForComponent(component: ts.ClassDeclaration): ts.Diagnostic[] {
+    const compilation = this.ensureAnalyzed();
+    const ttc = compilation.templateTypeChecker;
+    return this.addMessageTextDetails(ttc.getDiagnosticsForComponent(component));
+  }
+
   /**
    * Add Angular.io error guide links to diagnostics for this compilation.
    */

packages/language-service/ivy/language_service.ts

@@ -68,7 +68,6 @@ export class LanguageService {
 
   getSemanticDiagnostics(fileName: string): ts.Diagnostic[] {
     return this.withCompilerAndPerfTracing(PerfPhase.LsDiagnostics, (compiler) => {
-      const ttc = compiler.getTemplateTypeChecker();
       const diagnostics: ts.Diagnostic[] = [];
       if (isTypeScriptFile(fileName)) {
         const program = compiler.getCurrentProgram();
@@ -104,7 +103,7 @@ export class LanguageService {
         const components = compiler.getComponentsWithTemplateFile(fileName);
         for (const component of components) {
           if (ts.isClassDeclaration(component)) {
-            diagnostics.push(...ttc.getDiagnosticsForComponent(component));
+            diagnostics.push(...compiler.getDiagnosticsForComponent(component));
           }
         }
       }