diff --git a/contributingGuides/STYLE.md b/contributingGuides/STYLE.md
index 304811332916..e6660d848129 100644
--- a/contributingGuides/STYLE.md
+++ b/contributingGuides/STYLE.md
@@ -24,6 +24,7 @@
     - [Refs](#refs)
     - [Other Expensify Resources on TypeScript](#other-expensify-resources-on-typescript)
     - [Default value for inexistent IDs](#default-value-for-inexistent-IDs)
+    - [Extract complex types](#extract-complex-types)
 - [Naming Conventions](#naming-conventions)
     - [Type names](#type-names)
     - [Prop callbacks](#prop-callbacks)
@@ -492,6 +493,30 @@ const foo = report?.reportID ?? '-1';
 report ? report.reportID : '-1';
 ```
 
+### Extract complex types
+
+Advanced data types, such as objects within function parameters, should be separated into their own type definitions. Callbacks in function parameters should be extracted if there's a possibility they could be reused somewhere else.
+
+```ts
+// BAD
+function foo(param1: string, param2: {id: string}) {...};
+
+// BAD
+function foo(param1: string, param2: (value: string) => void) {...};
+
+// GOOD
+type Data = {
+    id: string;
+};
+
+function foo(param1: string, param2: Data) {...};
+
+// GOOD 
+type Callback = (value: string) => void
+
+function foo(param1: string, param2: Callback) {...};
+```
+
 ## Naming Conventions
 
 ### Type names