Updated the files.

my-app/node_modules/define-lazy-prop/index.d.ts

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+/**
+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;

my-app/node_modules/define-lazy-prop/index.js

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+'use strict';
+module.exports = (object, propertyName, fn) => {
+	const define = value => Object.defineProperty(object, propertyName, {value, enumerable: true, writable: true});
+
+	Object.defineProperty(object, propertyName, {
+		configurable: true,
+		enumerable: true,
+		get() {
+			const result = fn();
+			define(result);
+			return result;
+		},
+		set(value) {
+			define(value);
+		}
+	});
+
+	return object;
+};

my-app/node_modules/define-lazy-prop/license

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+MIT License
+
+Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

my-app/node_modules/define-lazy-prop/package.json

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+{
+	"name": "define-lazy-prop",
+	"version": "2.0.0",
+	"description": "Define a lazily evaluated property on an object",
+	"license": "MIT",
+	"repository": "sindresorhus/define-lazy-prop",
+	"author": {
+		"name": "Sindre Sorhus",
+		"email": "sindresorhus@gmail.com",
+		"url": "sindresorhus.com"
+	},
+	"engines": {
+		"node": ">=8"
+	},
+	"scripts": {
+		"test": "xo && ava && tsd"
+	},
+	"files": [
+		"index.js",
+		"index.d.ts"
+	],
+	"keywords": [
+		"lazy",
+		"property",
+		"properties",
+		"prop",
+		"define",
+		"object",
+		"value",
+		"lazily",
+		"laziness",
+		"evaluation",
+		"eval",
+		"execute",
+		"getter",
+		"function",
+		"fn",
+		"memoize",
+		"cache",
+		"defer",
+		"deferred"
+	],
+	"devDependencies": {
+		"ava": "^1.4.1",
+		"tsd": "^0.7.2",
+		"xo": "^0.24.0"
+	}
+}

my-app/node_modules/define-lazy-prop/readme.md

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+# define-lazy-prop [![Build Status](https://travis-ci.org/sindresorhus/define-lazy-prop.svg?branch=master)](https://travis-ci.org/sindresorhus/define-lazy-prop)
+
+> Define a [lazily evaluated](https://en.wikipedia.org/wiki/Lazy_evaluation) property on an object
+
+Useful when the value of a property is expensive to generate, so you want to delay the computation until the property is needed. For example, improving startup performance by deferring nonessential operations.
+
+
+## Install
+
+```
+$ npm install define-lazy-prop
+```
+
+
+## Usage
+
+```js
+const defineLazyProp = require('define-lazy-prop');
+
+const unicorn = {
+	// …
+};
+
+defineLazyProp(unicorn, 'rainbow', () => expensiveComputation());
+
+app.on('user-action', () => {
+	doSomething(unicorn.rainbow);
+});
+```
+
+
+## API
+
+### defineLazyProp(object, propertyName, fn)
+
+#### object
+
+Type: `Object`
+
+Object to add property to.
+
+#### propertyName
+
+Type: `string`
+
+Name of the property to add.
+
+#### fn
+
+Type: `Function`
+
+Called the first time `propertyName` is accessed. Expected to return a value.
+
+
+## Related
+
+- [lazy-value](https://github.com/sindresorhus/lazy-value) - Create a lazily evaluated value
+- [import-lazy](https://github.com/sindresorhus/import-lazy) - Import a module lazily
+- [p-lazy](https://github.com/sindresorhus/p-lazy) - Create a lazy promise
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)