Field Specification Functions

Declare the props for your React components using the field specification functions. These are used within the specificationFor function. Each function specifies how the value for the associated prop is determined.

const messageSpec = specificationFor(Message, {
    text: field(m => m.text),
    sender: property(j.for(Message.sender).then(UserName.forUser), n => n.value, "<sender>")
});