diff --git a/src/features/decorators/bonusDecorator.ts b/src/features/decorators/bonusDecorator.ts
index 1c26b14..b1c38cf 100644
--- a/src/features/decorators/bonusDecorator.ts
+++ b/src/features/decorators/bonusDecorator.ts
@@ -58,6 +58,11 @@ export type GenericBonusCompletionsFeature = Replace<
  * }), bonusAmountDecorator) as GenericRepeatable & GenericBonusAmountFeature
  */
 export const bonusAmountDecorator: Decorator<BonusAmountFeatureOptions, BaseBonusAmountFeature, GenericBonusAmountFeature> = {
+    preConstruct(feature) {
+        if (feature.amount === undefined) {
+            console.error(`Decorated feature ${feature.id} does not contain the required 'amount' property"`);
+        }
+    },
     postConstruct(feature) {
         processComputable(feature, "bonusAmount");
         if (feature.totalAmount === undefined) {
diff --git a/src/features/decorators/common.ts b/src/features/decorators/common.ts
index a4656d3..fb084db 100644
--- a/src/features/decorators/common.ts
+++ b/src/features/decorators/common.ts
@@ -2,11 +2,11 @@ import { Replace, OptionsObject } from "../feature";
 import { Computable, GetComputableType, processComputable, ProcessedComputable } from "util/computed";
 import { Persistent, State } from "game/persistence";
 
-export type Decorator<FeatureOptions, BaseFeature = Object, GenericFeature = BaseFeature, S extends State = State> = {
+export type Decorator<FeatureOptions, BaseFeature = object, GenericFeature = BaseFeature, S extends State = State> = {
     getPersistentData?(): Record<string, Persistent<S>>;
-    preConstruct?(feature: OptionsObject<FeatureOptions,BaseFeature,GenericFeature>): void;
-    postConstruct?(feature: OptionsObject<FeatureOptions,BaseFeature,GenericFeature>): void;
-    getGatheredProps?(feature: OptionsObject<FeatureOptions,BaseFeature,GenericFeature>): Partial<OptionsObject<FeatureOptions,BaseFeature,GenericFeature>>
+    preConstruct?(feature: OptionsObject<FeatureOptions,BaseFeature & {id:string},GenericFeature>): void;
+    postConstruct?(feature: OptionsObject<FeatureOptions,BaseFeature & {id:string},GenericFeature>): void;
+    getGatheredProps?(feature: OptionsObject<FeatureOptions,BaseFeature & {id:string},GenericFeature>): Partial<OptionsObject<FeatureOptions,BaseFeature & {id:string},GenericFeature>>
 }
 
 export type GenericDecorator = Decorator<unknown>;