message: refactor(compiler-cli): simplify and clarify `TypeScriptReflectionHost.isClass()`
  The comment in this function confused me, so I updated it to clarify that
  `isClass()` is not true for un-named classes.
  Also, I took the opportunity to use a helper method to simplify the function
  itself.
  PR Close
diff: @@ -10,6 +10,7 @@ import * as ts from 'typescript';
  import {ClassDeclaration, ClassMember, ClassMemberKind, CtorParameter, Declaration, Decorator, FunctionDefinition, Import, isDecoratorIdentifier, ReflectionHost} from './host';
  import {typeToValue} from './type_to_value';
  +import {isNamedClassDeclaration} from './util';
  /**
  * reflector.ts implements static reflection of declarations using the TypeScript `ts.TypeChecker`.
  @@ -121,9 +122,9 @@ export class TypeScriptReflectionHost implements ReflectionHost {
  }
  isClass(node: ts.Node): node is ClassDeclaration {
  - // In TypeScript code, classes are ts.ClassDeclarations.
  - // (`name` can be undefined in unnamed default exports: `default export class { ... }`)
  - return ts.isClassDeclaration(node) && (node.name !== undefined) && ts.isIdentifier(node.name);
  + // For our purposes, classes are "named" ts.ClassDeclarations;
  + // (`node.name` can be undefined in unnamed default exports: `default export class { ... }`).
  + return isNamedClassDeclaration(node);
  }
  hasBaseClass(clazz: ClassDeclaration): boolean {
  