@microsoft/sp-application-base package

SharePoint Framework support for building and extending client-side applications.

Classes

ApplicationAccessor	Provides access to the client-side application that is currently running.
ApplicationCustomizerContext	The component context for BaseApplicationCustomizer.
BaseApplicationCustomizer	This is the base class that third parties should extend when implementing a client-side extension that runs when an application is first starting.
PlaceholderContent	Represents custom content that is rendered inside a placeholder on a SharePoint page.
PlaceholderProvider	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.

The identifier for a content placeholder, which is a region on the page where third-party extensibility components can render custom content.