preact-x with compat with nextjs. Cannot find module 'preact/compat/server'

[marutib]

Hi All,

Very excited to try out the latest preact as a compat with Next.js .

Sandbox link :- https://codesandbox.io/s/823konwnw8?fontsize=14

Used module alias to integrate ;-

const moduleAlias = require('module-alias')

module.exports = () => {
  moduleAlias.addAlias('react', 'preact/compat')
  moduleAlias.addAlias('react-dom', 'preact/compat')
}

Here is the output error I am getting :-

$ node server.js
internal/modules/cjs/loader.js:605
    throw err;
    ^

Error: Cannot find module 'preact/compat/server'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:603:15)
    at Function.Module._resolveFilename (/Users/maruti/projects/test-nextjs/node_modules/module-alias/index.js:43:29)
    at Function.Module._load (internal/modules/cjs/loader.js:529:25)
    at Module.require (internal/modules/cjs/loader.js:658:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at Object.<anonymous> (/Users/maruti/projects/test-nextjs/node_modules/next-server/dist/server/render.js:14:18)
    at Module._compile (internal/modules/cjs/loader.js:722:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:733:10)
    at Module.load (internal/modules/cjs/loader.js:620:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:560:12)

[marutib]

The error is happening beause next.js is importing "react-dom/server" and it is not able to find it.

[developit]

Good catch! server.js wasn't listed in the files Preact includes when publishing to npm. Fix will go out shortly.

[damianobarbati]

Is the following still the right way to drop-in-replace react with preact using webpack? (not related to next.js).

    resolve: {
        alias: {
            'react': 'preact/compact',
            'react-dom': 'preact/compact',
        },
    },

[developit]

Yup - though you misspelled it, should be preact/compat! Once the fix is merged SSR will work again with that setup as well.

[damianobarbati]

@developit that stopped working for me in 10.x, I'm opening another issue with repro :)