app/lib/expense.tsx

@@ -8,9 +8,9 @@ export type PricingType = typeof pricingTypes[number];
 
 export class Expense implements Entity {
   id?: string;
-  name?: string;
-  amount?: number;
-  pricingType?: PricingType;
+  name: string;
+  amount: number;
+  pricingType: PricingType;
 
   constructor(id?: string, name?: string, amount?: number, pricingType?: PricingType) {
     this.id = id;