First version of our transform, which looks at each node and does nothing!

transform-value.v1.ts

// Dependencies:
import { Node, visitNode, SourceFile, TransformationContext, Transformer, TransformerFactory } from 'typescript';

export function transformer (source: SourceFile): TransformerFactory<Node> {
    return function (context: TransformationContext): Transformer<Node> {
        return function (node: Node): Node {
            return visitNode(node, visit);
        };

        function visit (node: Node): Node | Array<Node> {
            node = visitEachChild(node, visit, context);
            return node;
        }
    };
}