Improve TypeScript typings subsection

docs/developer-docs/latest/development/typescript.md

@@ -42,6 +42,31 @@ yarn develop
 
 </code-group>
 
+## Use TypeScript typings
+
+Strapi provides typings on the `Strapi` class to improve the TypeScript developing experience. These typings come with an autocomplete feature that automatically offers suggestions while developing.
+
+To experience TypeScript-based autocomplete while developing Strapi applications, you could try the following:
+
+1. From your code editor, open the `./src/index.ts` file.
+2. In the `register` method, declare the `strapi` argument as of type `Strapi`:
+
+    ```js
+    // path: ./src/index.ts
+
+    import '@strapi/strapi';
+
+    export default {
+      register( {strapi }: { strapi: Strapi }) {
+        // ...
+      },
+    };
+    ```
+
+2. Within the body of the `register` method, start typing `strapi.` and use keyboard arrows to browse the available properties.
+3. Choose `runLifecyclesfunction` from the list.
+4. When the `strapi.runLifecyclesFunctions` method is added, a list of available lifecycle types (i.e. `register`, `bootstrap` and `destroy`) are returned by the code editor. Use keyboard arrows to choose one of them and the code will autocomplete.
+
 ## Develop a plugin using TypeScript
 
 New plugins can be generated following the [plugins development documentation](/developer-docs/latest/development/plugins-development.md). There are 2 important distinctions for TypeScript applications: