MSGraphClient is a new HTTP client introduced in SharePoint Framework v1.6.0 that simplifies connecting to the Microsoft Graph inside SharePoint Framework solutions.
With MS Graph we use MSGraphClient to get information about the current user; this.context.msGraphClientFactory
.getClient()
.then((client: MSGraphClient): void => {
// get information about the current user from the Microsoft Graph
client
.api('/me')
.get((error, response: any, rawResponse?: any) => {
// handle the response
});
});
Reference:
https://www.c-sharpcorner.com/article/show-outlook-messages-from-microsoft-graph-in-spfx-client-side-web-part/