NextJS Still Requires React with Preact compatibility Plugin

Bug report

For my example project, I am unable to build and run unless I include react and react-dom in my dependencies, even if the build and server doesn’t actually use react.

[kenny@kenny-pc first-preact-app]$ yarn build
yarn run v1.16.0
$ next build
The module 'react' was not found. Next.js requires that you include it in 'dependencies' of your 'package.json'. To add it, run 'npm install --save react'
The module 'react-dom' was not found. Next.js requires that you include it in 'dependencies' of your 'package.json'. To add it, run 'npm install --save react-dom'
internal/modules/cjs/loader.js:670
    throw err;
    ^

Error: Cannot find module 'react'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:668:15)
    at Function.Module._load (internal/modules/cjs/loader.js:591:27)
    at Module.require (internal/modules/cjs/loader.js:723:19)
    at require (internal/modules/cjs/helpers.js:14:16)
    at Object.<anonymous> (/home/kenny/first-preact-app/node_modules/next/dist/bin/next:25:15)
    at Module._compile (internal/modules/cjs/loader.js:816:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:827:10)
    at Module.load (internal/modules/cjs/loader.js:685:32)
    at Function.Module._load (internal/modules/cjs/loader.js:620:12)
    at Function.Module.runMain (internal/modules/cjs/loader.js:877:12)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Describe the bug

The final build/server doesn’t use react react-dom, but is needed for the build in or else the errors appear. A clear and concise description of what the bug is.

To Reproduce

Clone first preact app, remove react and react-dom as dependencies, and then build.

Expected behavior

The build should work as the module aliases state that preact/compat should be aliased for react and react-dom.

System information

• Manjaro 18.04

[timneutkens]

The preact example was updated by Jason Miller: https://github.com/zeit/next.js/tree/canary/examples/using-preact

[kenk2]

I haven’t had time to work on this and unfortunately I’m not well versed enough in the internal working of nextJS to be able to diagnose the issue. Hoping a contributor can hop on this.