Wait for server initialization

You can manually trigger and wait for server initialization with the initIfNeeded method:

src/lib/getHypertune.ts

import { createSource } from "../generated/hypertune";

const hypertuneSource = createSource({
  token: process.env.HYPERTUNE_TOKEN!,
  initDataRefreshIntervalMs: 5_000,
});

export default async function getHypertune() {
  await hypertuneSource.initIfNeeded(); // Check for flag updates

  return hypertuneSource.root({
    args: {
      context: {
        environment:
          process.env.NODE_ENV === "development"
            ? "development"
            : "production",
        user: { id: "1", name: "Test", email: "[e-mail]" },
      },
    },
  });
}

When using initIfNeeded, the initDataRefreshIntervalMs option specifies the minimum time between initialization requests.

For example, if you set this to 5_000, initIfNeeded will only trigger a new initialization request if the last one was over 5 seconds ago.

So you can await initIfNeeded on every backend request to ensure flag values are fresh while minimizing network latency and bandwidth.

This is particularly useful in serverless and edge environments like Vercel deployments, Cloudflare Workers, AWS Lambdas, etc, where background SDK tasks like fetching updates aren't guaranteed to execute.

Check for server initialization

You can also check for server initialization with the getLastInitDataRefreshTime method:

src/components/ClientComponent.tsx

import { useHypertune } from "../generated/hypertune.react";

export default function ClientComponent() {
  const hypertune = useHypertune();

  if (!hypertune.getLastInitDataRefreshTime()) {
    return null;
  }

  const exampleFlag = hypertune.exampleFlag({ fallback: false });

  return <div>Example Flag: {String(exampleFlag)}</div>;
}