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      #thedivisor#Even though render trees can be different in various render passes, these trees are usually useful to find out what the <em>top-level</em> and <em>leaf components</em> are in a React app. Top-level components are the ones closest to the root component and influence the rendering performance of all the components below them. They often have the most complexity. Leaf components are near the bottom of the tree and do not have child components, and they are often re-rendered frequently.#thedivisor#Recognizing these types of components helps to understand the data flow and performance of your app.#thedivisor#Another relationship that can be shown with a tree in a React app is the app’s module dependencies. When we <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/importing-and-exporting-components#exporting-and-importing-a-component">split our components</a> and logic into different files, we create <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">JS modules</a> where we may export components, functions, or constants.#thedivisor#Each node in a module dependency tree is a module, and each branch stands for an <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">import</code> statement in that module.#thedivisor#If we take the previous Inspirations app, we can create a module dependency tree, or simply a dependency tree.#thedivisor#The module dependency tree for the Inspirations app.#thedivisor#The root node of the tree is the root module, also known as the entrypoint file. It is usually the module that includes the root component.#thedivisor#When we compare this to the render tree of the same app, there are similar structures but some important differences:#thedivisor#<li class="leading-relaxed mb-1">The nodes in the tree represent modules, not components.</li>
<li class="leading-relaxed mb-1">Modules that are not components, like <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">inspirations.js</code>, are also shown in this tree. The render tree only includes components.</li>
<li class="leading-relaxed mb-1"><code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Copyright.js</code> is found under <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">App.js</code>, but in the render tree, the <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Copyright</code> component appears as a child of <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">InspirationGenerator</code>. This is because <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">InspirationGenerator</code> accepts JSX as <a class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal" href="/learn/passing-props-to-a-component#passing-jsx-as-children">children props</a>, so it renders <code dir="ltr" class="inline text-code text-secondary dark:text-secondary-dark px-1 rounded-md no-underline bg-gray-30 bg-opacity-10 py-px">Copyright</code> as a child component but does not import the module.</li>#thedivisor#Dependency trees are helpful to figure out what modules are needed to run your React app. When preparing a React app for production, there is usually a build step that will package all the necessary JavaScript to deliver to the client. The tool that does this is called a <a href="https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Overview#the_modern_tooling_ecosystem" target="_blank" rel="nofollow noopener noreferrer" class="inline text-link dark:text-link-dark border-b border-link border-opacity-0 hover:border-opacity-100 duration-100 ease-in transition leading-normal">bundler</a>, and bundlers will use the dependency tree to decide which modules should be included.