GetFileNodesResult document is incorrect

[reccanti]

Hello!

I was working with this library, and it seems like the "document" that we return from api.getFileNodes doesn't reflect the actual data returned:

export interface GetFileNodesResult {
    name: string,
    lastModified: string,
    thumbnailUrl: string,
    version: string,
    err?: string,
    nodes: {
        [nodeId: string]: {
            document: Node<'DOCUMENT'>, // <-- this one!
            components: { [nodeId: string]: Component },
            schemaVersion: number,
            styles: { [styleName: string]: Style },
        }|null
    },
}

In actuality, I think this should be a more generic Node type, something like:

export interface GetFileNodesResult {
    name: string,
    lastModified: string,
    thumbnailUrl: string,
    version: string,
    err?: string,
    nodes: {
        [nodeId: string]: {
            document: Node<NodeType>, // <-- here
            components: { [nodeId: string]: Component },
            schemaVersion: number,
            styles: { [styleName: string]: Style },
        }|null
    },
}

or, if you wanted to add the ability to customize what's returned based on the IDs passed to getFileNodes, you could use generics like this:

export interface GetFileNodesResult<T extends Node<NodeType>> {
    name: string,
    lastModified: string,
    thumbnailUrl: string,
    version: string,
    err?: string,
    nodes: {
        [nodeId: string]: {
            document: T, // <-- here!
            components: { [nodeId: string]: Component },
            schemaVersion: number,
            styles: { [styleName: string]: Style },
        }|null
    },
}

// ...

function getFileNodesApi<T extends Node<NodeType> = Node<NodeType>>( // <-- uses all node types by default
  //...
): : Promise<GetFileNodesResult<T>>