fix(apps): Properly set the initial value state for isDecorated on mo…

…dels

Because the model's isDecorated value is set by static methods before construction, we cannot use the initialization support found in typescript.

apps/shared/models/base.ts

@@ -3,14 +3,18 @@ export type Constructor<T> = new (...args: any[]) => T;
 /** Base class for all models to inherit from. */
 export abstract class BaseModel<T> {
   data!: T;
-  /** The symbol marker for the function which decorated the model for either app or server. */
-  private isDecorated = false;
+  /**
+   * Whether the model is decorated, undecorated models will be undefined.
+   * Because this value is set by the static properties, we cannot initialize a value for it.
+   * */
+  private isDecorated: true | undefined;
 
   /** The data as stored in Firestore. */
   constructor(data: T) {
-    if (this.isDecorated === false) {
+    if (this.isDecorated !== true) {
       throw Error();
     }
+    this.data = data;
     this.setData(data);
   }