`process` is not defined error for Vite and Workers

TL;DR

For "ReferenceError: process is not defined": upgrade to resend >= 2.1.0. [zenorocha (maintainer)]: Fixed in v2.1.0.

ReferenceError: process is not defined

Steps

1. Issue resend/resend-node#237 (closed, 7 comments): Problem:

My challenge arises from the development environment I am using - Vite with React. Vite doesn't enable the direct use of process.env, which is typically how environment variables are accessed. Instead, it relies on import.meta.env for environment variables.

2. Error:

While trying to integrate Resend into my Vite React project, I encountered a critical issue. It seems that Resend's dependency files internally use process, which is not recognized within Vite, leading to a "Process is not defined" error. This error effectively blocks the usage of Resend within a Vite project, and as a

3. [zenorocha (maintainer)]: Fixed in v2.1.0. Root cause: the Node SDK referenced process.env at module load (e.g. var baseUrl = process.env.RESEND_BA... in resend.js), which throws ReferenceError: process is not defined on Vite, Cloudflare Pages/Workers, and other edge runtimes without the Node process global. Upgrade to resend >= 2.1.0.

When to use

You are seeing this: Issue resend/resend-node#237 (closed, 7 comments): Problem: My challenge arises from the development environment I am using - Vite with React. Use this skill when you run into "process is not defined error for Vite and Workers".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

Versions mentioned in the source: v2.1.0, 2.1.0. If you are on something much newer or older, the details may have shifted.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Asked in gh:resend/resend-node#237 (https://github.com/resend/resend-node/issues/237): process is not defined error for Vite and Workers. The issue report: Issue resend/resend-node#237 (closed, 7 comments): Problem: My challenge arises from the development environment I am using - Vite with React. Vite doesn't enable the direct use of process.env, which is typically how environment variables are accessed. Instead, it relies on import.meta.env for environment variables.

Error: While trying to integrate Resend into my Vite React project, I encountered a critical issue. It seems that Resend's dependency files internally use process, which is not recognized within Vite, leading to a "Process is not defined" error. This error effectively blocks the usage of Resend within a Vite project, and as a The verified answer: [zenorocha (maintainer)]: Fixed in v2.1.0. Root cause: the Node SDK referenced process.env at module load (e.g. var baseUrl = process.env.RESEND_BA... in resend.js), which throws ReferenceError: process is not defined on Vite, Cloudflare Pages/Workers, and other edge runtimes without the Node process global. Upgrade to resend >= 2.1.0.