diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 6acd8b10..19fdfae2 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -5,6 +5,7 @@
 ```bash
 git clone https://github.com/aidenybai/react-scan.git
 cd react-scan
+corepack enable
 pnpm install
 ```
 
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 5ff26bff..2c8e03a5 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -16,5 +16,8 @@
   "editor.colorDecorators": true,
   "[css]": {
     "editor.formatOnSave": false
+  },
+  "[typescript]": {
+    "editor.defaultFormatter": "biomejs.biome"
   }
 }
diff --git a/packages/scan/src/core/instrumentation.ts b/packages/scan/src/core/instrumentation.ts
index 584b69da..9277163c 100644
--- a/packages/scan/src/core/instrumentation.ts
+++ b/packages/scan/src/core/instrumentation.ts
@@ -86,12 +86,21 @@ export interface Change {
 export type Category = 'commit' | 'unstable' | 'unnecessary';
 
 export interface Render {
-  phase: string;
+  // TODO: use type exported from bippy instead.
+  phase: 'mount' | 'update' | 'unmount';
   componentName: string | null;
   time: number | null;
   count: number;
+  /**
+   * Whether the re-render occurred on a component wrapped with `React.memo()`.
+   */
   forget: boolean;
   changes: Array<Change> | null;
+  /**
+   * Determine if the render is unnecessary.
+   * Only sampling 5% of the renders to avoid performance impact.
+   * Otherwise, it will be `null`.
+   */
   unnecessary: boolean | null;
   didCommit: boolean;
   fps: number;
@@ -165,7 +174,6 @@ export const getPropsChanges = (fiber: Fiber) => {
   const prevProps = fiber.alternate?.memoizedProps || {};
   const nextProps = fiber.memoizedProps || {};
 
-
   const allKeys = new Set([
     ...Object.keys(prevProps),
     ...Object.keys(nextProps),