Can't build Nuxt app with Cloudflare preset

[gabrielmfern]

Describe the Bug

Running the build with the cloudflare preset

npx nuxi build --preset=cloudflare_pages

In a Nuxt app that imports and tries to send an email errors with

[nitro 12:13:43 PM]  ERROR  Error: Cannot resolve "@react-email/render" from ".../nuxt-resend-node-cloudflare/node_modules/.pnpm/resend@6.6.0/node_modules/resend/dist/index.mjs" and externals are not allowed!

[12:13:43 PM]  ERROR  Cannot resolve "@react-email/render" from ".../nuxt-resend-node-cloudflare/node_modules/.pnpm/resend@6.6.0/node_modules/resend/dist/index.mjs" and externals are not allowed!

    at Object.resolveId (node_modules/.pnpm/nitropack@2.12.9/node_modules/nitropack/dist/rollup/index.mjs:2011:17)
    at async PluginDriver.hookFirstAndGetPlugin (node_modules/.pnpm/rollup@4.54.0/node_modules/rollup/dist/es/shared/node-entry.js:22404:28)
    at async resolveId (node_modules/.pnpm/rollup@4.54.0/node_modules/rollup/dist/es/shared/node-entry.js:20880:26)
    at async ModuleLoader.resolveId (node_modules/.pnpm/rollup@4.54.0/node_modules/rollup/dist/es/shared/node-entry.js:21317:15)
    at async Object.resolveId (node_modules/.pnpm/@rollup+plugin-commonjs@28.0.9_rollup@4.54.0/node_modules/@rollup/plugin-commonjs/dist/es/index.js:617:10)
    at async PluginDriver.hookFirstAndGetPlugin (node_modules/.pnpm/rollup@4.54.0/node_modules/rollup/dist/es/shared/node-entry.js:22404:28)
    at async resolveId (node_modules/.pnpm/rollup@4.54.0/node_modules/rollup/dist/es/shared/node-entry.js:20880:26)
    at async ModuleLoader.resolveId (node_modules/.pnpm/rollup@4.54.0/node_modules/rollup/dist/es/shared/node-entry.js:21317:15)
    at async ModuleLoader.resolveDynamicImport (node_modules/.pnpm/rollup@4.54.0/node_modules/rollup/dist/es/shared/node-entry.js:21721:82)
    at async node_modules/.pnpm/rollup@4.54.0/node_modules/rollup/dist/es/shared/node-entry.js:21605:32

Link to the code that reproduces this issue

https://github.com/gabrielmfern/nuxt-resend-node-cloudflare

To Reproduce

1. Install dependencies

pnpm install

2. Run build with Cloudflare pages preset

npx nuxi build --preset=cloudflare_pages

3. See the errors on the optional dynamic import

[nitro 12:13:43 PM]  ERROR  Error: Cannot resolve "@react-email/render" from 
".../nuxt-resend-node-cloudflare/node_modules/.pnpm/resend@6.6.0/node_modules/resend/dist/index.mjs" 
and externals are not allowed!

Expected Behavior

The build to run properly without any errors when I'm not using the react option.

What's your node version? (if relevant)

24.12.0

[gabrielmfern]

It's possible to work around the issue by defining a rollup plugin that ignores @react-email/render when rollup finds it:

  nitro: {
    rollupConfig: {
      plugins: [
        {
          name: 'ignore-react-email-render',
          resolveId(id) {
            // Ignore @react-email/render as it's an optional dependency of resend
            if (id === '@react-email/render' || id.startsWith('@react-email/render/')) {
              return `\0virtual:${id}`;
            }
            return null;
          },
          load(id) {
            if (id.startsWith('\0virtual:@react-email/render')) {
              return 'export default {};';
            }
            return null;
          }
        }
      ],
    },
  }

[gabrielmfern]

nuxt/nuxt#33971

[gabrielmfern]

nitrojs/nitro#3903 moved it over to Nitro