Index: frontend/node_modules/define-lazy-prop/index.d.ts
===================================================================
--- frontend/node_modules/define-lazy-prop/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/define-lazy-prop/index.d.ts	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,33 @@
+/**
+Define a [lazily evaluated](https://en.wikipedia.org/wiki/Lazy_evaluation) property on an object.
+
+@param object - Object to add property to.
+@param propertyName - Name of the property to add.
+@param fn - Called the first time `propertyName` is accessed.
+
+@example
+```
+import defineLazyProp = require('define-lazy-prop');
+
+const unicorn = {
+	// …
+};
+
+defineLazyProp(unicorn, 'rainbow', () => expensiveComputation());
+
+app.on('user-action', () => {
+	doSomething(unicorn.rainbow);
+});
+```
+*/
+declare function defineLazyProp<
+	ObjectType extends {[key: string]: unknown},
+	PropertyNameType extends string,
+	PropertyValueType
+>(
+	object: ObjectType,
+	propertyName: PropertyNameType,
+	fn: () => PropertyValueType
+): ObjectType & {[K in PropertyNameType]: PropertyValueType};
+
+export = defineLazyProp;