Initialize variables - concrete case TTLCache

[gdiet]

I'd like to have a TTLCache available as variable, so it is available from the context like this: c.var.ttlCache. What I already have is (minimal demo for the problem, in reality I will use ttlCache to store objects...):

import { serve } from "@hono/node-server"
import { Hono } from "hono"
import TTLCache from "@isaacs/ttlcache"

const app = new Hono<{ Variables: { ttlCache: TTLCache<string, string> } }>()
app.get("/", (c) => c.text("The TTLCache is " + c.var.ttlCache))
serve(app, (info) => {
  console.log(`Listening on http://localhost:${info.port}`)
})

Not surprising, when I get the page, I see the response "The TTLCache is undefined".

How can I initialize the ttlCache variable on startup, e.g. to the following value?

new TTLCache({ max: 10000, ttl: 1000 })

[EdamAme-x]

How about using the c.env feature, albeit in a completely different direction?
A slight modification of the handler passed to the serve function should work.

[gdiet]

I don't get what you mean. The serve function is declared as

declare const serve: (options: Options, listeningListener?: ((info: AddressInfo) => void) | undefined) => ServerType;

and doesn't have a handler I could modify env with. Options are

type Options = {
    fetch: FetchCallback;
    port?: number;
    hostname?: string;
} & ServerOptions;

Can you provide additional hints? - Please excuse the delay, I was offline the last five weeks...