diff --git a/frontend/controllers/donation-controller.ts b/frontend/controllers/donation-controller.ts
index fd423d6..56648bd 100644
--- a/frontend/controllers/donation-controller.ts
+++ b/frontend/controllers/donation-controller.ts
@@ -2,29 +2,33 @@ import { Controller } from "@hotwired/stimulus";
 
 class DonationController extends Controller {
   static targets = ["input"];
+  inputTargets: any;
 
   setInputs(value: number) {
     // If the new value is one of the radios, select them
     // Else unselect all radios
     if (value) {
-      this.inputTargets.forEach((input) => {
-        if (input.type === "radio") {
-          input.checked = parseFloat(input.value) === value;
-        } else {
-          input.value = value;
+      this.inputTargets.forEach(
+        (input: { type: string; checked: boolean; value: string | number }) => {
+          if (input.type === "radio") {
+            input.checked = parseFloat(input.value as string) === value;
+          } else {
+            input.value = String(value);
+          }
         }
-      });
+      );
     } else {
-      this.inputTargets.forEach((input) => {
-        if (input.type === "radio") {
-          input.checked = false;
-        } else {
-          input.value = "0";
+      this.inputTargets.forEach(
+        (input: { type: string; checked: boolean; value: string }) => {
+          if (input.type === "radio") {
+            input.checked = false;
+          } else {
+            input.value = "0";
+          }
         }
-      });
+      );
     }
   }
-
   update(e: InputEvent) {
     let value = parseFloat((e.target as HTMLInputElement)?.value || "0") || 0;
     this.setInputs(value);
diff --git a/frontend/controllers/product-controller.ts b/frontend/controllers/product-controller.ts
index 87a1fac..c4d13a3 100644
--- a/frontend/controllers/product-controller.ts
+++ b/frontend/controllers/product-controller.ts
@@ -44,24 +44,33 @@ export default class ShopifyBuyControllerBase extends Controller {
   }
 
   updateAddToCartButton() {
-    const selectedOption = this.variantSelectorTarget.options[this.variantSelectorTarget.selectedIndex];
+    const selectedOption =
+      this.variantSelectorTarget.options[
+        this.variantSelectorTarget.selectedIndex
+      ];
     const selectedVariantId = selectedOption.value;
-    const inventoryQuantity = selectedOption.getAttribute('data-inventory-quantity');
-    const inventoryPolicy = selectedOption.getAttribute('data-inventory-policy');
-    this.addToCartButtonTarget.setAttribute('data-product-variant-id-param', selectedVariantId);
+    const inventoryQuantity = selectedOption.getAttribute(
+      "data-inventory-quantity"
+    );
+    const inventoryPolicy = selectedOption.getAttribute(
+      "data-inventory-policy"
+    );
+    this.addToCartButtonTarget.setAttribute(
+      "data-product-variant-id-param",
+      selectedVariantId
+    );
 
-    if (Number(inventoryQuantity) == 0 && inventoryPolicy == 'deny') {
-        this.addToCartButtonTarget.setAttribute('disabled', 'true');
+    if (Number(inventoryQuantity) == 0 && inventoryPolicy == "deny") {
+      this.addToCartButtonTarget.setAttribute("disabled", "true");
     } else {
-        this.addToCartButtonTarget.removeAttribute('disabled');
+      this.addToCartButtonTarget.removeAttribute("disabled");
     }
-}
+  }
   private LOCALSTORAGE_CHECKOUT_ID = "checkoutId";
 
-  get checkoutId() {
-    return window.localStorage
-      .getItem(this.LOCALSTORAGE_CHECKOUT_ID)
-      ?.toString();
+  get checkoutId(): string | number {
+    const id = window.localStorage.getItem(this.LOCALSTORAGE_CHECKOUT_ID);
+    return id ? id.toString() : "";
   }
 
   set checkoutId(id: string | number) {
@@ -81,7 +90,9 @@ export default class ShopifyBuyControllerBase extends Controller {
     });
 
     if (this.checkoutId) {
-      this.checkoutValue = await this.client.checkout.fetch(this.checkoutId);
+      this.checkoutValue = await this.client.checkout.fetch(
+        this.checkoutId.toString()
+      );
     }
 
     let checkoutIsExpired = false;
@@ -336,4 +347,4 @@ function currency(
 function length(arr: any[]) {
   if (!arr) return 0;
   return arr.length || 0;
-}
\ No newline at end of file
+}
diff --git a/frontend/main.ts b/frontend/main.ts
index e457de5..3f681a0 100644
--- a/frontend/main.ts
+++ b/frontend/main.ts
@@ -6,7 +6,13 @@ import "bootstrap";
 import initialiseSentry from "./sentry";
 import initialisePosthog from "./posthog";
 import { startApp } from "groundwork-django";
-const controllers = import.meta.glob("./controllers/*-controller.ts");
+import { ControllerConstructor } from "@hotwired/stimulus";
+
+const controllers = import.meta.glob("./controllers/*-controller.ts") as Record<
+  string,
+  () => Promise<{ default: ControllerConstructor }>
+>;
+
 Turbo.session.drive = false;
 
 initialisePosthog();
diff --git a/package.json b/package.json
index 8a5a743..32c172c 100644
--- a/package.json
+++ b/package.json
@@ -48,5 +48,4 @@
     "vite": "^5.0.2"
   },
   "packageManager": "yarn@1.22.22"
-
 }