Gremlin groovy to JavaScript

Question

I'm using Gremlin (JS library) to communicate with JanusGraph. I have the following groovy code which works well in the groovy console:

g.V().project('id', 'data').by(id).by(valueMap('value').by(unfold()))

But when I copy this code to JS it says that id, valueMap, and unfold are undefined. How can I rewrite the groovy code to valid JS?

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EDIT

I know I can use the client and submit the query as shown below, but that's inconvenient given the fact that we already have, I suppose, a fully working JS library.

const c = new driver.Client('ws://localhost:8182/gremlin');
const q = `
      g.V()
        .project('id', 'data')
        .by(id)
        .by(
          valueMap('value')
            .by(unfold())
        )
    `;

return await c.submit(q);