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Use the Elysia adapter to inject an inertia helper into route context.

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Import

import { elysiaAdapter } from "inertia-server/elysia";

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Basic setup

Remember to configure your helpers according to the installation guide installation 
import { Elysia } from "elysia";
import { elysiaAdapter } from "inertia-server/elysia";
import { createHelper } from "./inertia";

const app = new Elysia()
  .use(elysiaAdapter(createHelper))
  .get("/", ({ inertia }) => {
    return inertia.render(homePage({ title: "Dashboard" }));
  });

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Setup with flash/session support

If you use inertia.flash(...) or inertia.errors(...), provide a flash adapter. Your session implementation may vary, in the example we are using a pseudo-code for a simple cookie based sessions. 
import { Elysia } from "elysia";
import { elysiaAdapter } from "inertia-server/elysia";
import { createHelper } from "./inertia";
import { sessionStore } from "./session";

const app = new Elysia()
  .derive((ctx) => ({
    sessionId: sessionStore.getSessionId(ctx.request),
  }))
  .use(
    elysiaAdapter(createHelper, (ctx) => ({
      getAll: () => sessionStore.getFlash(ctx.sessionId),
      set: (data) => {
        sessionStore.setFlash(ctx.sessionId, data);
      },
    })),
  )
  .onAfterHandle((ctx) => {
    ctx.set.headers["Set-Cookie"] = sessionStore.createCookieHeader(
      ctx.sessionId,
    );
  });

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Route usage

Once attached, inertia is available in your handlers: 
app.post("/users", ({ inertia }) => {
  inertia.flash("success", "User created");
  return inertia.redirect("/users");
});