chore: Remove deprecated requestInfo.headers API

[justinvdm]

This change removes two APIs to simplify the developer experience:

1. The deprecated headers property from the RequestInfo interface.
2. The undocumented resolveSSRValue helper function.

BREAKING CHANGE: requestInfo.headers removal

The headers property on the RequestInfo object has been removed. All response header modifications should now be done through the response.headers object.

Migration Guide

To update your code, replace any usage of requestInfo.headers with requestInfo.response.headers.

Before:

const myMiddleware = (requestInfo) => {
  requestInfo.headers.set('X-Custom-Header', 'my-value');
};

After:

const myMiddleware = (requestInfo) => {
  requestInfo.response.headers.set('X-Custom-Header', 'my-value');
};

BREAKING CHANGE: resolveSSRValue removal

The resolveSSRValue helper function has been removed. SSR-only functions can now be imported and called directly within Server Actions without this wrapper.

Migration Guide

Remove the resolveSSRValue wrapper and call the SSR function directly.

Before:

import { env } from "cloudflare:workers";
import { ssrSendWelcomeEmail } from "@/app/email/ssrSendWelcomeEmail";
import { resolveSSRValue } from "rwsdk/worker";

export async function sendWelcomeEmail(formData: FormData) {
  const doSendWelcomeEmail = await resolveSSRValue(ssrSendWelcomeEmail);

  const email = formData.get("email") as string;

  if (!email) {
    console.error("❌ Email is required");
    return { error: "Email is required", success: false };
  }

  const { data, error } = await doSendWelcomeEmail(env.RESEND_API, email);

  if (error) {
    console.error("❌ Error sending email", error);
    return { error: error.message, success: false };
  }

  console.log("📥 Email sent successfully", data);
  return { success: true, error: null };
}

After:

import { env } from "cloudflare:workers";
import { ssrSendWelcomeEmail } from "@/app/email/ssrSendWelcomeEmail";

export async function sendWelcomeEmail(formData: FormData) {
  const email = formData.get("email") as string;

  if (!email) {
    console.error("❌ Email is required");
    return { error: "Email is required", success: false };
  }

  const { data, error } = await ssrSendWelcomeEmail(env.RESEND_API, email);

  if (error) {
    console.error("❌ Error sending email", error);
    return { error: error.message, success: false };
  }

  console.log("📥 Email sent successfully", data);
  return { success: true, error: null };
}

[cloudflare-workers-and-pages]

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