Provides access to the client-side application that is currently running.

The component context for BaseApplicationCustomizer.

This is the system base class for client-side applications. It manages the overall life cycle of your application, and is the first entry point for your code to start executing when the page loads. The two main events are onLoad() which occurs first, and onRender() which occurs after the application manager has initialized the environment and completed rendering the page chrome.

Context object for a client-side applications.

This is the base class that third parties should extend when implementing a client-side extension that runs when an application is first starting.

Represents custom content that is rendered inside a placeholder on a SharePoint page.

Allows third-party components to discover and use SharePoint placeholders. Placeholders enable third-party components to render custom content into designated regions on the page.