react-facebook/dist/types/constants/MessengerSize.d.ts

Facebook components like a Login button, Like, Share, Comments, Embedded Post/Video, Messenger Chat, and Facebook Pixel tracking

declare enum MessengerSize {
    SMALL = "small",
    MEDIUM = "medium",
    STANDARD = "standard",
    LARGE = "large",
    XLARGE = "xlarge"
}
export default MessengerSize;