Next.js: Error: Cannot find module when deploying to heroku

[nvartolomei]

Using latest next.js relase and a simple hello world index page with 0 dependencies fails to run on heroku with the following error:

{ Error: Cannot find module '/tmp/build_xxx/node_modules/babel-runtime/helpers/inherits'
    at Function.Module._resolveFilename (module.js:455:15)
    at Function.Module._load (module.js:403:25)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/app/.next/dist/pages/index.js:7:18)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3) code: 'MODULE_NOT_FOUND' }

[eezing]

What does your package.json look like? Did it ever work on Heroku, or just this version?

[nvartolomei]

Exactly as in readme. First time tried it on heroku.

On 5 Nov 2016, 19:39 +0200, Eric Zingeler [email protected], wrote:

What's you package.json look like? Did it ever work on Heroku, or just this version?

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[eezing]

Maybe devDependencies is needed. Heroku by default only installs dependencies when deploying.

Give this a go:
https://devcenter.heroku.com/articles/nodejs-support#devdependencies

[nvartolomei]

@eezing I have only one dependency, next.

[eezing]

@nvartolomei

Is the 'next build' command happening before 'next start'?

[Huglo]

Hello,

I have exactly the same issue:

2016-11-07T21:26:31.802385+00:00 app[web.1]: { Error: Cannot find module '/tmp/build_55ae646128a2d187aba0de41013a15bc/n
ode_modules/react/react.js'
2016-11-07T21:26:31.802399+00:00 app[web.1]:     at Function.Module._resolveFilename (module.js:469:15)
2016-11-07T21:26:31.802401+00:00 app[web.1]:     at Function.Module._load (module.js:417:25)
2016-11-07T21:26:31.802401+00:00 app[web.1]:     at Module.require (module.js:497:17)
2016-11-07T21:26:31.802402+00:00 app[web.1]:     at require (internal/module.js:20:19)
2016-11-07T21:26:31.802403+00:00 app[web.1]:     at Object.<anonymous> (/app/.next/dist/pages/index.js:7:14)
2016-11-07T21:26:31.802403+00:00 app[web.1]:     at Module._compile (module.js:570:32)
2016-11-07T21:26:31.802404+00:00 app[web.1]:     at Object.Module._extensions..js (module.js:579:10)
2016-11-07T21:26:31.802404+00:00 app[web.1]:     at Module.load (module.js:487:32)
2016-11-07T21:26:31.802405+00:00 app[web.1]:     at tryModuleLoad (module.js:446:12)
2016-11-07T21:26:31.802406+00:00 app[web.1]:     at Function.Module._load (module.js:438:3) code: 'MODULE_NOT_FOUND' }
2016-11-07T21:26:31.806064+00:00 app[web.1]: { Error: Cannot find module '/tmp/build_55ae646128a2d187aba0de41013a15bc/n
ode_modules/babel-runtime/helpers/inherits'
2016-11-07T21:26:31.806067+00:00 app[web.1]:     at Function.Module._load (module.js:417:25)
2016-11-07T21:26:31.806066+00:00 app[web.1]:     at Function.Module._resolveFilename (module.js:469:15)
2016-11-07T21:26:31.806067+00:00 app[web.1]:     at Module.require (module.js:497:17)
2016-11-07T21:26:31.806068+00:00 app[web.1]:     at require (internal/module.js:20:19)
2016-11-07T21:26:31.806069+00:00 app[web.1]:     at Object.<anonymous> (/app/.next/dist/pages/_error.js:7:18)
2016-11-07T21:26:31.806069+00:00 app[web.1]:     at Module._compile (module.js:570:32)
2016-11-07T21:26:31.806070+00:00 app[web.1]:     at Object.Module._extensions..js (module.js:579:10)
2016-11-07T21:26:31.806071+00:00 app[web.1]:     at Module.load (module.js:487:32)
2016-11-07T21:26:31.806071+00:00 app[web.1]:     at tryModuleLoad (module.js:446:12)
2016-11-07T21:26:31.806072+00:00 app[web.1]:     at Function.Module._load (module.js:438:3) code: 'MODULE_NOT_FOUND' }
2016-11-07T21:26:31.808680+00:00 app[web.1]: (node:23) UnhandledPromiseRejectionWarning: Unhandled promise rejection (r
ejection id: 1): TypeError: res.status is not a function

I followed your advice @eezing and I forced the install of the devDependencies with:
$ heroku config:set NPM_CONFIG_PRODUCTION=false

I checked: the next build command is happening before the next start one

And like @nvartolomei I only have next as dependncy

Anyone running on Heroku successfully?
Thanks

[nvartolomei]

@eezing unfortunately I don't have time at the moment to dig into this.

[hnordt]

Same problem here:

{ [Error: Cannot find module '/tmp/build/node_modules/react/react.js'] code: 'MODULE_NOT_FOUND' }
{ [Error: Cannot find module '/tmp/build/node_modules/babel-runtime/helpers/inherits'] code: 'MODULE_NOT_FOUND' }

[nkzawa]

next.js transforms some require paths to absolute ones on next build, but it looks these paths couldn't be resolved on runtime. Maybe because of module cache Heroku does ?

[evantahler]

This appears other places (like a Flynn cluster) which use the Heroku buildpacks:

Error: Cannot find module /app/.next/dist/pages/_error

[evantahler]

Is there a verbose option on next build?

[evantahler]

I can confirm via downloading a Flynn slug (which uses Heroku buildpacks) that next build assets are not getting compiled into the slug.

I'll take a crack at solving this via PR... it will likely require the use of relative paths all over the place

re: https://github.com/flynn/flynn/issues/3696

[evantahler]

I can confirm that both on Flynn and Heroku the next build step does bake in absolute paths for require statements. This is problematic as the build location (/tmp/build) is not going to be the same as the runtime location (/app). This bug can be renamed more concisely next build should not use absolute paths

[dotcypress]

For heroku/dokku you might use prestart npm script to build next.js app.

"scripts": {
  "prestart": "next build",
  "start": "next start -p ${PORT}",
}

[Huglo]

Yes @dotcypress, adding a prestart step solved my issue. Thanks

[nkzawa]

I think we should consider to make react and babel-runtime peerDependencies, which would solve https://github.com/zeit/next.js/issues/204 too.

@arunoda @rauchg thoughts ?

[naistran]

@nkzawa If you're making react a peer dependency, please consider making glamor one as well. Would help solve #184.

[arunoda]

This is related to the common babel-runtime error.
We get a way with CRA and Storybook by disabling helpers and polyfills.
See here

Asking user to provide to react and react-dom seems pretty okay. But asking to provide babel-runtime would be kind a ugly.

If we are not going to turn off helpers, we may could do some Webpack's require.resolve magic to get around with this.

[evantahler]

The prestart solution as provided by @dotcypress is enough to get things working, but I would still suggest that Next:

A: Not use absolute paths when compiling
B: Allow the user to provide the pathname of the eventual deployment directory so the compiled assets will work, IE: next build {path to project} --runtimeDir=/app

[nkzawa]

Another way to resolve modules from next, we can transpile code like

// before
const foo = require('babel-runtime/foo')

// after
const foo = require('next/require')('babel-runtime/foo')

next/require would look like:

export default (moduleId) => require(moduleId) 

Though we'd need a workaround for the webpack compilation since dynamic require doesn't properly work on webpack.

[dotcypress]

BTW: prestart approach don't work with Dokku Zero Downtime Deploys

Sad, but this is blocker for our project, how can i help with fix?
@nkzawa @rauchg

[arunoda]

@dotcypress how about using some buildpacks.
For an example this: https://github.com/weibeld/heroku-buildpack-run

With that, you could run a bash script when building the heroku slug.

[dotcypress]

@arunoda but how this will help with Dokku Zero Downtime Deploys?

[arunoda]

I assume, Dokku uses buildpacks behind the scene.
That's why I suggest to use that buildpack.

[rauchg]

The problem of zero downtime deployment is completely unrelated to Next.js.

So is building. Our focus is to provide a _simple_ way to build. Just like you develop with next, you build with next build + launch with next start.

This is already documented here: https://github.com/zeit/next.js#production-deployment

With now, we take care of zero downtime by having you deploy, and then use now alias to give it a "final" URL. Not a single request is dropped. But that is true for any now deployment you make, next or HTTP API or static site or whatever.

[benhjames]

So I'm getting the same issue deploying to Heroku:

{ Error: Cannot find module '/tmp/build_78e9.../node_modules/babel-runtime/core-js/object/get-prototype-of' ...

The suggestion of adding a "prestart": "next build" fails in my case since the build time for the app is too long and Heroku times out. Besides, prestart is not really the place to put a build step - that should ideally go in heroku-postbuild (i.e. run it once instead of on every dyno startup).

So I've been investigating the webpack config, and yeah, it looks like the aliasing of react, babel-runtime and the next/css etc. are outputting absolute paths, causing Heroku to fall over when it moves the files from the temporary build directory tmp to the runtime app directory.

I've managed to work around this by removing babel-plugin-module-resolver and its aliases config to stop outputting absolute paths. However, doing so meant that it couldn't find next/css (for some reason?) etc., so I modified to the externals to:

externals: [
  'react',
  'react-dom',
  'next/link',
  'next/css',
  'next/head'
]

These changes now all work perfectly in cases where next is a dependency i.e. exists in node_modules, however it will cause the tests in this repo to fall over because there is no next in node_modules in this repo itself, so calling require('next/css') at runtime will complain that it doesn't exist.

Here's where I'm stuck. I'm aware that local tests are an edge case, and I was hoping to just write something like import css from '../../../../css' and expect that it would work, but for some reason, it doesn't. I'm therefore looking for any advice on this to solve this case! :)

This is preventing me from deploying on Heroku ATM so would really appreciate feedback - cheers!

[rauchg]

In cases where your process runs out of memory, wouldn't it make sense to pre-build prior to deployment? Or maybe I'm not understanding

[benhjames]

Sure, but the issue of resolving absolute paths would still remain i.e.:

import css from 'next/css'

Goes through babel-loader and gets turned into the absolute:

import css from '/builddir.../dist/lib/css'

Which won't resolve once the app is launched onto the dyno since either:

a) /builddir.../ doesn't exist anymore if it's built on Heroku
b) /builddir.../ doesn't exist at all if it's built locally and pushed up to Heroku

So I'm kind of wondering why aliasing is even needed when next/css can just resolve immediately to node_modules/next/css - I'm guessing this is for the default error pages/local tests?

[rauchg]

Got it @benhjames. Didn't realize we were going with absolute paths. I assume making them relative would fix this issue? If so, that'd be a better and more explicit issue to create.

Thanks for following up

[benhjames]

No worries, will create in a bit :+1:

[FaridSafi]

https://github.com/mars/heroku-nextjs seems to work

[benhjames]

I'd be hesitant to say that a heroku buildpack that copies files around is a fix: the crux of the issue is the absolute paths injected into the built files (see #360 and PR #361). Any other PaaS that builds and serves from different directories would also run into this issue (or indeed, moving dirs around on your own computer).

In the meanwhile though, using that buildpack would work fine!

[rauchg]

Completely agree with @benhjames

[rauchg]

I just want to make sure the fix is an elegant one, and not a series of hard-to-maintain workarounds. If necessary, we can always patch webpack as well

[havenS]

Hi, just to contribute. I managed to run my app on Heroku with the recent commits on beta which allow to define a .babelrc thank to @benhjames comment earlier on the issue.
I added a .babelrcfile at the root containing:

{
  "presets" : [
    "es2015",
    "react",
    "stage-0"
  ],
  "plugins": [
    "react-require", 
    "transform-async-to-generator", 
    "transform-object-rest-spread", 
    "transform-class-properties", 
    "transform-runtime"
  ]
}

I also added in my package.json:

{
  ...
  "scripts": {
    ...
    "heroku-postbuild": "next build"
  },
  "dependencies": {
    "babel": "^6.5.2",
    "babel-loader": "^6.2.10",
    "babel-plugin-react-require": "^3.0.0",
    "babel-plugin-transform-async-to-generator": "^6.16.0",
    "babel-plugin-transform-class-properties": "^6.19.0",
    "babel-plugin-transform-export-extensions": "^6.8.0",
    "babel-plugin-transform-object-rest-spread": "^6.20.2",
    "babel-plugin-transform-runtime": "^6.15.0",
    "babel-polyfill": "^6.20.0",
    "babel-preset-es2015": "^6.18.0",
    "babel-preset-react": "^6.16.0",
    "babel-preset-stage-0": "^6.16.0",
    "babel-preset-stage-3": "^6.17.0",
    "babel-runtime": "^6.20.0",
    ...
  }
}

If it can be of any help to any anyone.

[arunoda]

@nkzawa @rauchg May be we could ship a babel preset which optimized only for NPM3+
So, everyone don't wanna do something like this.

Or we could do the other way around as well.
What do you guys think?

[nkzawa]

May be we could ship a babel preset which optimized only for NPM3+

Does this mean not to use absolute paths ?
I wonder if this works if multiple modules has a same dependency of different versions even on NPM 3+. I think setting NODE_PATH would be better.

[benhjames]

I'm not sure that having a .babelrc which omits the offending babel plugin (babel-plugin-module-resolver) would work as @nkzawa mentions: if there are multiple modules of react, for example, it won't resolve to the next version of react and may fall over. If you (hypothetically) had a package like:

"next": "latest"
"react": "latest"

Then at runtime, react would resolve to node_modules/react whereas we actually want node_modules/next/node_modules/react. Equally, I'm not sure how setting NODE_PATH would fix this, since NODE_PATH is only ever used if require doesn't resolve to anything normally. So NODE_PATH would never be searched since react is guaranteed to be resolved?

[nkzawa]

NODE_PATH is only ever used if require doesn't resolve to anything normally

I didn't know this :|

[nkzawa]

Maybe we can replace require('react') with require('next/react') and serve our version of React from next/react ?

[benhjames]

Yeah, I think that's pretty clean - nice idea! We'd also need to do that with babel-runtime, react-dom and styled-jsx.

[KidkArolis]

I ran into the same issue with Flynn - next build is executed in /tmp which then doesn't work once moved to the application location since the absolute paths look at /tmp.

I'm slightly confused as to why this and all related issues are closed.. Is there a known fix?

[KidkArolis]

In my case, what seems to have worked is this Procfile:

web: npm run build && npm start -- --port $PORT

Not sure that's ideal

[benhjames]

Yeah, I reckon either this issue (which has more discussion in it) or #360 (which has less discussion but defines the actual problem more in detail) should be re-opened!

And yep, doing that in Procfile isn't ideal because a) you end up running the build every time you relaunch a dyno, even though it wouldn't have changed, and b) if you timeout while starting up the dyno (which happened to me!) then your dyno just crashes.

The best workaround so far is to use the heroku-nextjs-build pack.

I like @nkzawa's suggestion, because all you'd have to do in the Babel loader is transform react into next/react. I wonder how that would work in running local tests though (how do you resolve next to itself if it doesn't exist in node_modules?) There would need to be some flag somewhere (maybe an env var) that only rewrites when not doing tests... There is quite a lot of complexity going on here. :)

[benhjames]

Or, thinking about it more, could just set NODE_PATH while tests are running, since next/link for example is guaranteed not to resolve.

[Gregoor]

Would love to use now, unfortunately I need a DB (namely PG), so I have to go with Postgres.

Anyway, a problem with most of the approaches named here for me is that they assume that the client app can be built without the backend running. In my case I need the BE running so that the babel-relay plugin can get the GraphQL schema and verify that all the client's data requirements can be resolved.
What that means is that the build would have to be run, after the server has started. Is there an API to start the build process programmatically?

[sakulstra]

Someone managed to run next.js inside dokku yet?
I had some problems with babel plugins in dev dependencies which I could resolve by running dokku config:set <appname> NPM_CONFIG_PRODUCTION=false

Additionally I added:

"prestart": "next build",
"start": "next start -p $PORT",

like suggested above and it seems to successfully build/run now. But I still cannot access the app :/ I don't get any errors so I think it's a next.js unrelated port mapping problem - anyways it would be intresting to know if there are better solutions out there as the prestart hack seems wrong to me.

[arunoda]

Guys we took https://github.com/zeit/next.js/pull/1164 in.
So, we could use Next.js apps on heroku without much trouble.

[MikeSchroll]

@sakulstra: Yes, I run it in dokku. It is possible.

[jlobos]

postinstall work perfect in express + next

    "build": "next build",
    "dev": "node server.js",
    "postinstall": "npm run build",
    "start": "NODE_ENV=production node server.js"

[benbonnet]

hi, is that just me or anything tried to deploy on heroku results in a timeout ?

first though it was my app, then tried out the default custom-server-express from the next's examples. even tried out this repo https://github.com/mars/heroku-nextjs-custom-server-express, also @jlobos post install, @havenS babel additions, anything related to this problem highlighted here… nothing worked, always timeouted.

Below the package example :

{
  "scripts": {
    "dev": "node server.js",
    "build": "next build",
    "start": "NODE_ENV=production node server.js",
    "heroku-postbuild": "heroku-nextjs-build"
  },
  "dependencies": {
    "@mars/heroku-nextjs-build": "^2.0.0",
    "express": "^4.14.0",
    "next": "latest",
    "react": "^15.4.2",
    "react-dom": "^15.4.2"
  },
  "engines": {
    "node": "6.9.x"
  },
  "cacheDirectories": [
    "nextjs/node_modules"
  ]
}

No wonder the very same works perfectly on now.sh though; My problem is that the timeout is the only relevant info heroku is providing. Any recommendations ?

[benhjames]

@bbnnt I'm running on Heroku with no trouble atm - btw there's no need to use @mars/heroku-nextjs-build as we fixed the issues that necessitated using a custom buildpack. 😃

I have an npm script "heroku-postbuild": "npm run build" that runs the build script: "build": "next build" - it'll takes around a minute or so but well within the postbuild timeout.

What's the full timeout error? Maybe something is failing when being built causing a hang somewhere - can you build your app locally fine?

[benbonnet]

sent this message too early maybe; my bad. Started out with a fresh heroku app; won't investigate about why I was stuck, can say though it effectively works perfectly!

[jcheroske]

Just got through this today. There were two parts to getting it working.

1. Move babel-related dependencies from devDependencies to dependencies. I moved:

    "babel-plugin-module-resolver": "^2.7.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-stage-0": "^6.24.1",

I didn't move:

    "babel-eslint": "^7.2.3",

1. Added a script and modified another, in package.json:

        "heroku-postbuild": "next build",
        "start": "next start -p $PORT",

[tomsoderlund]

Tried this today. As for @KidkArolis, my solution was adding a Procfile with:

web: npm run build && npm start -- --port $PORT

as well as heroku-postbuild to package.json:

{
    "name": "my-nextjs-app",
    "scripts": {
        "dev": "next",
        "build": "next build",
        "start": "next start",
        "heroku-postbuild": "next build"
    },
    "dependencies": {
        "lodash": "^4.17.4",
        "next": "^3.0.0-beta16",
        "react": "^15.6.1",
        "react-dom": "^15.6.1"
    }
}

As you can see, no further changes to dependencies were needed.

[jcheroske]

@tomsoderlund, does that mean that every time you restart your dyno it does a build?

[evantahler]

You no longer need the buildpack or a custom procfile (next v2+) for Heroku. www.actionherojs.com is a Next project, and its full source is here https://github.com/actionhero/www.actionherojs.com.

Just include the following in your package.json

 "scripts": {
    "dev": "node server.js",
    "build": "next build",
    "postinstall": "npm run build",
    "start": "NODE_ENV=production node server.js"
  }

[timneutkens]

@evantahler this is great news! :100:

[tomsoderlund]

@jcheroske I'm not 100% sure, but based on the time required to restart vs. when building (I can see when heroku-postbuild kicks in while building), I'd say: no.

[exogenesys]

Hi, I deleted a load of files and I'm getting this error on pushing to Heroku. It seems like a previous build is looking for one of those files? I don't understand why this is happening and where did I go wrong. I have faced this problem one time before, but apparently, it fixed itself then.

Error: ./pages/profile.js?entry
        Module not found: Error: Can't resolve '../components/BeenThereDoneThat' in '/tmp/build_1da9423f972469c21ed0ce9fed0e7555/pages'

It then tries to find the file in multiple directories, using multiple file extensions. It doesn't exist anymore.

I have tried to use heroku repo:purge_cache -a appname and even heroku repo:reset -a appname but they didn't have any effect.

Using heroku-postbuild doesn't work either. What is the reason? Help me out! Thanks! :)

[paulwehner]

When I run 'npm run build' and 'npm run start' locally everything works. When I push to Heroku I get:

Counting objects: 15, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (15/15), done.
Writing objects: 100% (15/15), 1.68 KiB | 0 bytes/s, done.
Total 15 (delta 10), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Node.js app detected
remote: 
remote: -----> Creating runtime environment
remote:        
remote:        NPM_CONFIG_LOGLEVEL=error
remote:        NPM_CONFIG_PRODUCTION=true
remote:        NODE_VERBOSE=false
remote:        NODE_ENV=production
remote:        NODE_MODULES_CACHE=true
remote: 
remote: -----> Installing binaries
remote:        engines.node (package.json):  unspecified
remote:        engines.npm (package.json):   unspecified (use default)
remote:        
remote:        Resolving node version 6.x...
remote:        Downloading and installing node 6.11.2...
remote:        Detected package-lock.json: defaulting npm to version 5.x.x
remote:        Bootstrapping npm 5.x.x (replacing 3.10.10)...
remote:        npm 5.3.0 installed
remote: 
remote: -----> Restoring cache
remote:        Loading 2 from cacheDirectories (default):
remote:        - node_modules
remote:        - bower_components (not cached - skipping)
remote: 
remote: -----> Building dependencies
remote:        Installing node modules (package.json + package-lock)
remote:        added 138 packages, removed 29 packages, updated 55 packages and moved 38 packages in 15.982s
remote:        Running heroku-postbuild
remote:        
remote:        > [email protected] heroku-postbuild /tmp/build_ae550831d468592305c997f870a65ebf
remote:        > next build
remote:        
remote: module.js:471
remote:     throw err;
remote:     ^
remote: 
remote: Error: Cannot find module 'webpack'
remote:     at Function.Module._resolveFilename (module.js:469:15)
remote:     at Function.Module._load (module.js:417:25)
remote:     at Module.require (module.js:497:17)
remote:     at require (internal/module.js:20:19)
remote:     at Object.<anonymous> (/tmp/build_ae550831d468592305c997f870a65ebf/node_modules/next/dist/server/build/webpack.js:35:16)
remote:     at Module._compile (module.js:570:32)
remote:     at Object.Module._extensions..js (module.js:579:10)
remote:     at Module.load (module.js:487:32)
remote:     at tryModuleLoad (module.js:446:12)
remote:     at Function.Module._load (module.js:438:3)
remote: npm ERR! code ELIFECYCLE
remote: npm ERR! errno 1
remote: npm ERR! [email protected] heroku-postbuild: `next build`
remote: npm ERR! Exit status 1
remote: npm ERR! 
remote: npm ERR! Failed at the [email protected] heroku-postbuild script.
remote: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
remote: 
remote: npm ERR! A complete log of this run can be found in:
remote: npm ERR!     /app/.npm/_logs/2017-08-17T12_08_45_682Z-debug.log
remote: 
remote: -----> Build failed
remote:        
remote:        We're sorry this build is failing! You can troubleshoot common issues here:
remote:        https://devcenter.heroku.com/articles/troubleshooting-node-deploys
remote:        
remote:        Some possible problems:
remote:        
remote:        - Node version not specified in package.json
remote:        https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version
remote:        
remote:        Love,
remote:        Heroku
remote:        
remote:  !     Push rejected, failed to compile Node.js app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...

It was working fine earlier on heroku, and I did some updates to my server.js script related to 'connect-redis' session functions, and now the above happens.

[paulwehner]

And when I purge the cache from my Heroku instance, there error looks like:

Counting objects: 15, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (15/15), done.
Writing objects: 100% (15/15), 1.68 KiB | 0 bytes/s, done.
Total 15 (delta 10), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Node.js app detected
remote: 
remote: -----> Creating runtime environment
remote:        
remote:        NPM_CONFIG_LOGLEVEL=error
remote:        NPM_CONFIG_PRODUCTION=true
remote:        NODE_VERBOSE=false
remote:        NODE_ENV=production
remote:        NODE_MODULES_CACHE=true
remote: 
remote: -----> Installing binaries
remote:        engines.node (package.json):  unspecified
remote:        engines.npm (package.json):   unspecified (use default)
remote:        
remote:        Resolving node version 6.x...
remote:        Downloading and installing node 6.11.2...
remote:        Detected package-lock.json: defaulting npm to version 5.x.x
remote:        Bootstrapping npm 5.x.x (replacing 3.10.10)...
remote:        npm 5.3.0 installed
remote: 
remote: -----> Restoring cache
remote:        Skipping cache restore (not-found)
remote: 
remote: -----> Building dependencies
remote:        Installing node modules (package.json + package-lock)
remote:        
remote:        > [email protected] install /tmp/build_6e7c0b3c49351b622334001f0b7aa85b/node_modules/tomahawk/node_modules/socket.io/node_modules/engine.io/node_modules/ws
remote:        > (node-gyp rebuild 2> builderror.log) || (exit 0)
remote:        
remote:        make: Entering directory '/tmp/build_6e7c0b3c49351b622334001f0b7aa85b/node_modules/tomahawk/node_modules/socket.io/node_modules/engine.io/node_modules/ws/build'
remote:        CXX(target) Release/obj.target/bufferutil/src/bufferutil.o
remote:        bufferutil.target.mk:96: recipe for target 'Release/obj.target/bufferutil/src/bufferutil.o' failed
remote:        make: Leaving directory '/tmp/build_6e7c0b3c49351b622334001f0b7aa85b/node_modules/tomahawk/node_modules/socket.io/node_modules/engine.io/node_modules/ws/build'
remote:        
remote:        > [email protected] install /tmp/build_6e7c0b3c49351b622334001f0b7aa85b/node_modules/tomahawk/node_modules/socket.io/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws
remote:        > (node-gyp rebuild 2> builderror.log) || (exit 0)
remote:        
remote:        make: Entering directory '/tmp/build_6e7c0b3c49351b622334001f0b7aa85b/node_modules/tomahawk/node_modules/socket.io/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/build'
remote:        CXX(target) Release/obj.target/bufferutil/src/bufferutil.o
remote:        bufferutil.target.mk:96: recipe for target 'Release/obj.target/bufferutil/src/bufferutil.o' failed
remote:        make: Leaving directory '/tmp/build_6e7c0b3c49351b622334001f0b7aa85b/node_modules/tomahawk/node_modules/socket.io/node_modules/socket.io-client/node_modules/engine.io-client/node_modules/ws/build'
remote:        
remote:        > [email protected] postinstall /tmp/build_6e7c0b3c49351b622334001f0b7aa85b/node_modules/uglifyjs-webpack-plugin
remote:        > node lib/post_install.js
remote:        
remote:        added 1009 packages in 41.242s
remote:        Running heroku-postbuild
remote:        
remote:        > [email protected] heroku-postbuild /tmp/build_6e7c0b3c49351b622334001f0b7aa85b
remote:        > next build
remote:        
remote: module.js:471
remote:     throw err;
remote:     ^
remote: 
remote: Error: Cannot find module 'webpack/lib/RequestShortener'
remote:     at Function.Module._resolveFilename (module.js:469:15)
remote:     at Function.Module._load (module.js:417:25)
remote:     at Module.require (module.js:497:17)
remote:     at require (internal/module.js:20:19)
remote:     at Object.<anonymous> (/tmp/build_6e7c0b3c49351b622334001f0b7aa85b/node_modules/friendly-errors-webpack-plugin/src/core/extractWebpackError.js:4:26)
remote:     at Module._compile (module.js:570:32)
remote:     at Object.Module._extensions..js (module.js:579:10)
remote:     at Module.load (module.js:487:32)
remote:     at tryModuleLoad (module.js:446:12)
remote:     at Function.Module._load (module.js:438:3)
remote: npm ERR! code ELIFECYCLE
remote: npm ERR! errno 1
remote: npm ERR! [email protected] heroku-postbuild: `next build`
remote: npm ERR! Exit status 1
remote: npm ERR! 
remote: npm ERR! Failed at the [email protected] heroku-postbuild script.
remote: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
remote: 
remote: npm ERR! A complete log of this run can be found in:
remote: npm ERR!     /app/.npm/_logs/2017-08-17T12_15_48_787Z-debug.log
remote: 
remote: -----> Build failed
remote:        
remote:        We're sorry this build is failing! You can troubleshoot common issues here:
remote:        https://devcenter.heroku.com/articles/troubleshooting-node-deploys
remote:        
remote:        Some possible problems:
remote:        
remote:        - Node version not specified in package.json
remote:        https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version
remote:        
remote:        Love,
remote:        Heroku
remote:        
remote:  !     Push rejected, failed to compile Node.js app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !   Push rejected to ....
remote: 

[benhjames]

@paulwehner looks weird, what happens if you regenerate package-lock.json - or indeed, use a yarn lockfile?

[tomsoderlund]

I had problems with Heroku not finding NPM's after upgrading from Next.js 3 beta to 3.2.2, but disabling Heroku's caching of Node modules solved it:

heroku config:set NODE_MODULES_CACHE=false

[MacKentoch]

Source if the issues is Heroku production DOES NOT install devDependecies.

So move to dependencies all build modules you need.

Just ugly but Heroku works that way...

[danursin]

A few things worth checking, some noted here already:

• only use dependencies, not dev-dependencies
• use postinstall to run any build scripts (typescript for example)
• use process.env.PORT variable (not process.env.port) to allow heroku to set the port
• ensure functions marked async really are async. May work locally but breaks on heroku build

[craigcartmell]

Here's another hilarious solution if you're still having trouble. Create a prestart script which builds the .next bundle and then delays the start command.

./prestart.js

// Delay the yarn start script until .next has been fully built
setTimeout(function() {
  let exec = require('child_process').exec, child;

  child = exec('yarn build',
    function (error, stdout, stderr) {
      console.log('stdout: ' + stdout);
      console.log('stderr: ' + stderr);
      if (error !== null) {
        console.log('exec error: ' + error);
      }
    });
}, 5000)

./package.json

Assumes you're using a custom server.js file. If not, just run next start as your start script.

"scripts": {
    "build": "next build",
    "prestart": "node ./prestart.js",
    "start": "NODE_ENV=production node server.js -p $PORT",
  },

[pencilcheck]

Looks like this issue is more closer to https://github.com/zeit/next.js/issues/3533

I'm on next 5, getting the same issue on heroku

A snippet of the error on heroku after deploy

2018-02-15T19:57:06.616452+00:00 app[web.1]:     at require (internal/module.js:20:19)
2018-02-15T19:57:06.616456+00:00 app[web.1]:     at Object.187 (/app/.next/dist/bundles/pages/_document.js:86:18)
2018-02-15T19:57:06.616458+00:00 app[web.1]:     at __webpack_require__ (/app/.next/dist/bundles/pages/_document.js:23:31)
2018-02-15T19:57:06.616460+00:00 app[web.1]:     at Object.186 (/app/.next/dist/bundles/pages/_document.js:78:18)
2018-02-15T19:57:06.616461+00:00 app[web.1]:     at __webpack_require__ (/app/.next/dist/bundles/pages/_document.js:23:31)
2018-02-15T19:57:06.616463+00:00 app[web.1]:     at /app/.next/dist/bundles/pages/_document.js:70:18
2018-02-15T19:57:06.616465+00:00 app[web.1]:     at Object.<anonymous> (/app/.next/dist/bundles/pages/_document.js:73:10) code: 'MODULE_NOT_FOUND' }
2018-02-15T19:57:06.623908+00:00 app[web.1]: { Error: Cannot find module '/tmp/build_9ecf90c5383be7151436c12b01c561e1/node_modules/next/dist/pages/_error.js'
2018-02-15T19:57:06.623910+00:00 app[web.1]:     at Function.Module._resolveFilename (module.js:476:15)
2018-02-15T19:57:06.623911+00:00 app[web.1]:     at Function.Module._load (module.js:424:25)
2018-02-15T19:57:06.623912+00:00 app[web.1]:     at Module.require (module.js:504:17)
2018-02-15T19:57:06.623914+00:00 app[web.1]:     at require (internal/module.js:20:19)
2018-02-15T19:57:06.623915+00:00 app[web.1]:     at Object.185 (/app/.next/dist/bundles/pages/_error.js:86:18)
2018-02-15T19:57:06.623916+00:00 app[web.1]:     at __webpack_require__ (/app/.next/dist/bundles/pages/_error.js:23:31)
2018-02-15T19:57:06.623917+00:00 app[web.1]:     at Object.184 (/app/.next/dist/bundles/pages/_error.js:78:18)
2018-02-15T19:57:06.623919+00:00 app[web.1]:     at __webpack_require__ (/app/.next/dist/bundles/pages/_error.js:23:31)
2018-02-15T19:57:06.623920+00:00 app[web.1]:     at /app/.next/dist/bundles/pages/_error.js:70:18
2018-02-15T19:57:06.623921+00:00 app[web.1]:     at Object.<anonymous> (/app/.next/dist/bundles/pages/_error.js:73:10) code: 'MODULE_NOT_FOUND' }

[marcelorl]

@craigcartmell it worked just fine for me.

I know it doesnt seems to be the "best" solution, but as a quick fix, it fits perfectly.

thank you.

[watthecode]

"scripts": { "prestart": "next build", "start": "next start -p ${PORT}", }
@dotcypress 's solution above allowed me to finally at least load my home page... but if I go to any other route than '/', I get this error. It seems I can load the files fine, but I get a 500 error on the route?

[FelixKirmse]

Yeah this definitely still exist in next 5, or maybe re-appeared, whatever. The issue should be re-opened. I'm transpiling typescript, but doesn't matter if I use awesome-ts-loader or normal next-typescript, using either heroku-postbuild or postinstall to build will bake in absolute paths. This issue is also the first google search result. Using prestart is a naive solution, as even a middle-sized app will cause a timeout on start...

2018-03-19T12:03:31.030588+00:00 app[web.1]: { Error: Cannot find module '/tmp/build_c20f3b76f6bee76686e9fc44cf4184d1/app-name-25af881616238ff70d6efecd625937324fb80679/node_modules/next/dist/pages/_error.js'
2018-03-19T12:03:31.030600+00:00 app[web.1]:     at Function.Module._resolveFilename (module.js:543:15)
2018-03-19T12:03:31.030602+00:00 app[web.1]:     at Function.Module._load (module.js:470:25)
2018-03-19T12:03:31.030603+00:00 app[web.1]:     at Module.require (module.js:593:17)
2018-03-19T12:03:31.030604+00:00 app[web.1]:     at require (internal/module.js:11:18)
2018-03-19T12:03:31.030606+00:00 app[web.1]:     at Object.36 (/app/.next/dist/bundles/pages/_error.js:86:18)
2018-03-19T12:03:31.030608+00:00 app[web.1]:     at __webpack_require__ (/app/.next/dist/bundles/pages/_error.js:23:31)
2018-03-19T12:03:31.030609+00:00 app[web.1]:     at Object.35 (/app/.next/dist/bundles/pages/_error.js:78:18)
2018-03-19T12:03:31.030611+00:00 app[web.1]:     at __webpack_require__ (/app/.next/dist/bundles/pages/_error.js:23:31)
2018-03-19T12:03:31.030612+00:00 app[web.1]:     at /app/.next/dist/bundles/pages/_error.js:70:18
2018-03-19T12:03:31.030614+00:00 app[web.1]:     at Object.<anonymous> (/app/.next/dist/bundles/pages/_error.js:73:10) code: 'MODULE_NOT_FOUND' }

Fixed it! I just added @mars/heroku-nextjs-build and set my "postbuild": "heroku-nextjs-build". Apparently this is an old, outdated way to do it and not needed, but I beg to differ. Finally some relieve. Leaving rest of comment up in case next wants to actually fix this.

[bawgz]

My app deploys fine using next@4. Upgrading to next@5 I get the Cannot find module errors.

[timneutkens]

Upgrade to next@canary for now, there'll be a new stable release very soon 👍

[dushyantucreate]

Hello everyone,
I am facing some issue while deploying on heroku. after complete build heroku log shows me some error. Please help me out.

2018-08-02T11:37:50.384799+00:00 heroku[web.1]: Starting process with command npm start
2018-08-02T11:37:52.479778+00:00 app[web.1]:
2018-08-02T11:37:52.479800+00:00 app[web.1]: > [email protected] start /app
2018-08-02T11:37:52.479802+00:00 app[web.1]: > cross-env NODE_ENV=development node server
2018-08-02T11:37:52.479804+00:00 app[web.1]:
2018-08-02T11:37:52.830037+00:00 app[web.1]: internal/modules/cjs/loader.js:583
2018-08-02T11:37:52.830072+00:00 app[web.1]: throw err;
2018-08-02T11:37:52.830074+00:00 app[web.1]: ^
2018-08-02T11:37:52.830076+00:00 app[web.1]:
2018-08-02T11:37:52.830079+00:00 app[web.1]: Error: Cannot find module 'webpack'
2018-08-02T11:37:52.830081+00:00 app[web.1]: at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)
2018-08-02T11:37:52.830083+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:507:25)
2018-08-02T11:37:52.830085+00:00 app[web.1]: at Module.require (internal/modules/cjs/loader.js:637:17)
2018-08-02T11:37:52.830087+00:00 app[web.1]: at require (internal/modules/cjs/helpers.js:20:18)
2018-08-02T11:37:52.830089+00:00 app[web.1]: at Object. (/app/internals/webpack/webpack.dev.babel.js:8:17)
2018-08-02T11:37:52.830091+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:689:30)
2018-08-02T11:37:52.830092+00:00 app[web.1]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
2018-08-02T11:37:52.830095+00:00 app[web.1]: at Module.load (internal/modules/cjs/loader.js:599:32)
2018-08-02T11:37:52.830097+00:00 app[web.1]: at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
2018-08-02T11:37:52.830098+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:530:3)
2018-08-02T11:37:52.841737+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2018-08-02T11:37:52.842251+00:00 app[web.1]: npm ERR! errno 1
2018-08-02T11:37:52.847589+00:00 app[web.1]: npm ERR! [email protected] start: cross-env NODE_ENV=development node server
2018-08-02T11:37:52.847598+00:00 app[web.1]: npm ERR! Exit status 1
2018-08-02T11:37:52.847601+00:00 app[web.1]: npm ERR!
2018-08-02T11:37:52.847604+00:00 app[web.1]: npm ERR! Failed at the [email protected] start script.
2018-08-02T11:37:52.847606+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2018-08-02T11:37:52.852427+00:00 app[web.1]:
2018-08-02T11:37:52.853063+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2018-08-02T11:37:52.853067+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2018-08-02T11_37_52_846Z-debug.log
2018-08-02T11:37:52.936888+00:00 heroku[web.1]: State changed from starting to crashed
2018-08-02T11:37:52.939706+00:00 heroku[web.1]: State changed from crashed to starting
2018-08-02T11:37:52.917875+00:00 heroku[web.1]: Process exited with status 1
2018-08-02T11:37:56.000000+00:00 app[api]: Build succeeded
2018-08-02T11:37:58.666367+00:00 heroku[web.1]: Starting process with command npm start
2018-08-02T11:38:01.987224+00:00 app[web.1]:
2018-08-02T11:38:01.987249+00:00 app[web.1]: > [email protected] start /app
2018-08-02T11:38:01.987252+00:00 app[web.1]: > cross-env NODE_ENV=development node server
2018-08-02T11:38:01.987253+00:00 app[web.1]:
2018-08-02T11:38:02.431047+00:00 app[web.1]: internal/modules/cjs/loader.js:583
2018-08-02T11:38:02.431072+00:00 app[web.1]: throw err;
2018-08-02T11:38:02.431073+00:00 app[web.1]: ^
2018-08-02T11:38:02.431075+00:00 app[web.1]:
2018-08-02T11:38:02.431076+00:00 app[web.1]: Error: Cannot find module 'webpack'
2018-08-02T11:38:02.431078+00:00 app[web.1]: at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)
2018-08-02T11:38:02.431079+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:507:25)
2018-08-02T11:38:02.431081+00:00 app[web.1]: at Module.require (internal/modules/cjs/loader.js:637:17)
2018-08-02T11:38:02.431082+00:00 app[web.1]: at require (internal/modules/cjs/helpers.js:20:18)
2018-08-02T11:38:02.431084+00:00 app[web.1]: at Object. (/app/internals/webpack/webpack.dev.babel.js:8:17)
2018-08-02T11:38:02.431085+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:689:30)
2018-08-02T11:38:02.431086+00:00 app[web.1]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
2018-08-02T11:38:02.431088+00:00 app[web.1]: at Module.load (internal/modules/cjs/loader.js:599:32)
2018-08-02T11:38:02.431089+00:00 app[web.1]: at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
2018-08-02T11:38:02.431091+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:530:3)
2018-08-02T11:38:02.440582+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2018-08-02T11:38:02.441020+00:00 app[web.1]: npm ERR! errno 1
2018-08-02T11:38:02.442131+00:00 app[web.1]: npm ERR! [email protected] start: cross-env NODE_ENV=development node server
2018-08-02T11:38:02.442285+00:00 app[web.1]: npm ERR! Exit status 1
2018-08-02T11:38:02.442519+00:00 app[web.1]: npm ERR!
2018-08-02T11:38:02.442686+00:00 app[web.1]: npm ERR! Failed at the [email protected] start script.
2018-08-02T11:38:02.442843+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2018-08-02T11:38:02.447318+00:00 app[web.1]:
2018-08-02T11:38:02.447457+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2018-08-02T11:38:02.447542+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2018-08-02T11_38_02_444Z-debug.log
2018-08-02T11:38:02.500683+00:00 heroku[web.1]: Process exited with status 1
2018-08-02T11:38:02.521430+00:00 heroku[web.1]: State changed from starting to crashed
2018-08-02T11:38:06.378583+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=react-boilerplate-d.herokuapp.com request_id=0628c426-9466-4c9d-a38c-22e8923cc981 fwd="111.93.125.106" dyno= connect= service= status=503 bytes= protocol=https
2018-08-02T11:38:07.848705+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=react-boilerplate-d.herokuapp.com request_id=28182669-14d4-4ce1-8274-09c0db1b4aba fwd="111.93.125.106" dyno= connect= service= status=503 bytes= protocol=https

[dushyantucreate]

Hello everyone,
I am facing some issue while deploying on heroku. after complete build heroku log shows me some error. Please help me out.

2018-08-02T11:37:50.384799+00:00 heroku[web.1]: Starting process with command npm start
2018-08-02T11:37:52.479778+00:00 app[web.1]:
2018-08-02T11:37:52.479800+00:00 app[web.1]: > [email protected] start /app
2018-08-02T11:37:52.479802+00:00 app[web.1]: > cross-env NODE_ENV=development node server
2018-08-02T11:37:52.479804+00:00 app[web.1]:
2018-08-02T11:37:52.830037+00:00 app[web.1]: internal/modules/cjs/loader.js:583
2018-08-02T11:37:52.830072+00:00 app[web.1]: throw err;
2018-08-02T11:37:52.830074+00:00 app[web.1]: ^
2018-08-02T11:37:52.830076+00:00 app[web.1]:
2018-08-02T11:37:52.830079+00:00 app[web.1]: Error: Cannot find module 'webpack'
2018-08-02T11:37:52.830081+00:00 app[web.1]: at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)
2018-08-02T11:37:52.830083+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:507:25)
2018-08-02T11:37:52.830085+00:00 app[web.1]: at Module.require (internal/modules/cjs/loader.js:637:17)
2018-08-02T11:37:52.830087+00:00 app[web.1]: at require (internal/modules/cjs/helpers.js:20:18)
2018-08-02T11:37:52.830089+00:00 app[web.1]: at Object. (/app/internals/webpack/webpack.dev.babel.js:8:17)
2018-08-02T11:37:52.830091+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:689:30)
2018-08-02T11:37:52.830092+00:00 app[web.1]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
2018-08-02T11:37:52.830095+00:00 app[web.1]: at Module.load (internal/modules/cjs/loader.js:599:32)
2018-08-02T11:37:52.830097+00:00 app[web.1]: at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
2018-08-02T11:37:52.830098+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:530:3)
2018-08-02T11:37:52.841737+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2018-08-02T11:37:52.842251+00:00 app[web.1]: npm ERR! errno 1
2018-08-02T11:37:52.847589+00:00 app[web.1]: npm ERR! [email protected] start: cross-env NODE_ENV=development node server
2018-08-02T11:37:52.847598+00:00 app[web.1]: npm ERR! Exit status 1
2018-08-02T11:37:52.847601+00:00 app[web.1]: npm ERR!
2018-08-02T11:37:52.847604+00:00 app[web.1]: npm ERR! Failed at the [email protected] start script.
2018-08-02T11:37:52.847606+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2018-08-02T11:37:52.852427+00:00 app[web.1]:
2018-08-02T11:37:52.853063+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2018-08-02T11:37:52.853067+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2018-08-02T11_37_52_846Z-debug.log
2018-08-02T11:37:52.936888+00:00 heroku[web.1]: State changed from starting to crashed
2018-08-02T11:37:52.939706+00:00 heroku[web.1]: State changed from crashed to starting
2018-08-02T11:37:52.917875+00:00 heroku[web.1]: Process exited with status 1
2018-08-02T11:37:56.000000+00:00 app[api]: Build succeeded
2018-08-02T11:37:58.666367+00:00 heroku[web.1]: Starting process with command npm start
2018-08-02T11:38:01.987224+00:00 app[web.1]:
2018-08-02T11:38:01.987249+00:00 app[web.1]: > [email protected] start /app
2018-08-02T11:38:01.987252+00:00 app[web.1]: > cross-env NODE_ENV=development node server
2018-08-02T11:38:01.987253+00:00 app[web.1]:
2018-08-02T11:38:02.431047+00:00 app[web.1]: internal/modules/cjs/loader.js:583
2018-08-02T11:38:02.431072+00:00 app[web.1]: throw err;
2018-08-02T11:38:02.431073+00:00 app[web.1]: ^
2018-08-02T11:38:02.431075+00:00 app[web.1]:
2018-08-02T11:38:02.431076+00:00 app[web.1]: Error: Cannot find module 'webpack'
2018-08-02T11:38:02.431078+00:00 app[web.1]: at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)
2018-08-02T11:38:02.431079+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:507:25)
2018-08-02T11:38:02.431081+00:00 app[web.1]: at Module.require (internal/modules/cjs/loader.js:637:17)
2018-08-02T11:38:02.431082+00:00 app[web.1]: at require (internal/modules/cjs/helpers.js:20:18)
2018-08-02T11:38:02.431084+00:00 app[web.1]: at Object. (/app/internals/webpack/webpack.dev.babel.js:8:17)
2018-08-02T11:38:02.431085+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:689:30)
2018-08-02T11:38:02.431086+00:00 app[web.1]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
2018-08-02T11:38:02.431088+00:00 app[web.1]: at Module.load (internal/modules/cjs/loader.js:599:32)
2018-08-02T11:38:02.431089+00:00 app[web.1]: at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
2018-08-02T11:38:02.431091+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:530:3)
2018-08-02T11:38:02.440582+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2018-08-02T11:38:02.441020+00:00 app[web.1]: npm ERR! errno 1
2018-08-02T11:38:02.442131+00:00 app[web.1]: npm ERR! [email protected] start: cross-env NODE_ENV=development node server
2018-08-02T11:38:02.442285+00:00 app[web.1]: npm ERR! Exit status 1
2018-08-02T11:38:02.442519+00:00 app[web.1]: npm ERR!
2018-08-02T11:38:02.442686+00:00 app[web.1]: npm ERR! Failed at the [email protected] start script.
2018-08-02T11:38:02.442843+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2018-08-02T11:38:02.447318+00:00 app[web.1]:
2018-08-02T11:38:02.447457+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2018-08-02T11:38:02.447542+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2018-08-02T11_38_02_444Z-debug.log
2018-08-02T11:38:02.500683+00:00 heroku[web.1]: Process exited with status 1
2018-08-02T11:38:02.521430+00:00 heroku[web.1]: State changed from starting to crashed
2018-08-02T11:38:06.378583+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=react-boilerplate-d.herokuapp.com request_id=0628c426-9466-4c9d-a38c-22e8923cc981 fwd="111.93.125.106" dyno= connect= service= status=503 bytes= protocol=https
2018-08-02T11:38:07.848705+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=react-boilerplate-d.herokuapp.com request_id=28182669-14d4-4ce1-8274-09c0db1b4aba fwd="111.93.125.106" dyno= connect= service= status=503 bytes= protocol=https

[ghost]

Im having same problem of all of you.

Local it works, but while in heroku or NOW , has same errors.

How to fix it? Or where can I deploy it?

[briandavidjoyner]

Hey all,

Looks like the same issue is happening with Next v8.

Here's what I have setup.

• ONLY using dependencies (no dev dependencies)
• .next and node-modules are excluded via the gitignore
• NPM_CONFIG_LOGLEVEL=error
• NODE_ENV=production
• NODE_MODULES_CACHE=true
• NODE_VERBOSE=false

I've tried a few methods to get the build to run as expected.

• postinstall, heroku-postbuild, and a Procfile.
• Tried 'npm run build' and 'next build' across all 3 attempts

No matter what I do - here's the log I get minus expected differences from the different methods.

-----> Node.js app detected

-----> Creating runtime environment

       NPM_CONFIG_LOGLEVEL=error
       NODE_ENV=production
       NODE_MODULES_CACHE=true
       NODE_VERBOSE=false

-----> Installing binaries
       engines.node (package.json):  10.15.0
       engines.npm (package.json):   6.8.0

       Resolving node version 10.15.0...
       Downloading and installing node 10.15.0...
       Bootstrapping npm 6.8.0 (replacing 6.4.1)...
       npm 6.8.0 installed

-----> Restoring cache
       - node_modules is checked into source control and cannot be cached

-----> Building dependencies
       Prebuild detected (node_modules already exists)
       Rebuilding any native modules

       > [email protected] install /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/fsevents
       > node install

       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/next
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/core
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/code-frame
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/highlight
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/chalk
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/ansi-styles
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/color-convert
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/color-name
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/escape-string-regexp
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/supports-color
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/has-flag
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/esutils
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/js-tokens
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/generator
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/types
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/lodash
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/to-fast-properties
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/jsesc
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/source-map
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/trim-right
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helpers
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/template
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/parser
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/traverse
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-function-name
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-get-function-arity
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-split-export-declaration
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/traverse/node_modules/debug
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/ms
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/globals
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/convert-source-map
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/safe-buffer
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/debug
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/json5
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/resolve
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/path-parse
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/semver
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-proposal-class-properties
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-member-expression-to-functions
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-optimise-call-expression
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-plugin-utils
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-replace-supers
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-syntax-class-properties
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-proposal-object-rest-spread
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-syntax-object-rest-spread
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-syntax-dynamic-import
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-modules-commonjs
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-module-transforms
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-module-imports
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-simple-access
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-module-transforms/node_modules/@babel/template
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-runtime
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-runtime/node_modules/resolve
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/preset-env
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-proposal-async-generator-functions
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-remap-async-to-generator
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-annotate-as-pure
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-wrap-function
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-syntax-async-generators
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-proposal-json-strings
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-syntax-json-strings
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-proposal-optional-catch-binding
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-syntax-optional-catch-binding
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-proposal-unicode-property-regex
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-regex
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/regexpu-core
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/regenerate
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/regenerate-unicode-properties
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/regjsgen
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/regjsparser
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/regjsparser/node_modules/jsesc
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/unicode-match-property-ecmascript
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/unicode-canonical-property-names-ecmascript
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/unicode-property-aliases-ecmascript
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/unicode-match-property-value-ecmascript
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-arrow-functions
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-async-to-generator
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-block-scoped-functions
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-block-scoping
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-classes
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-define-map
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-computed-properties
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-destructuring
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-dotall-regex
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-duplicate-keys
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-exponentiation-operator
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-builder-binary-assignment-operator-visitor
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-explode-assignable-expression
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-for-of
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-function-name
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-literals
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-modules-amd
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-modules-systemjs
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-hoist-variables
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-modules-umd
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-new-target
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-object-super
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-parameters
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-call-delegate
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-regenerator
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/regenerator-transform
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/private
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-shorthand-properties
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-spread
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-sticky-regex
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-template-literals
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-typeof-symbol
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-unicode-regex
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/browserslist
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/caniuse-lite
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/electron-to-chromium
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/node-releases
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/invariant
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/loose-envify
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/js-levenshtein
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/preset-react
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-react-display-name
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-react-jsx
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/helper-builder-react-jsx
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-syntax-jsx
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-react-jsx-self
       @babel/[email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/@babel/plugin-transform-react-jsx-source
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/uuid
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/ansi-html
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/react-dom
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/escape-html
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/http-errors
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/setprototypeof
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/statuses
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/lodash.debounce
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/on-finished
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/path-to-regexp
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/pseudomap
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/remove-trailing-separator
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/mime
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/nan
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/send
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/send/node_modules/ms
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/fsevents/node_modules/detect-libc
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/fsevents/node_modules/mkdirp
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/fsevents/node_modules/chownr
       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/fsevents/node_modules/fs-minipass
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       [email protected] /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/fsevents/node_modules/minizlib
       Installing any new modules (package.json)

       > [email protected] postinstall /tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/preact
       > node -e "console.log('\u001b[35m\u001b[1mLove Preact? You can now donate to our open collective:\u001b[22m\u001b[39m\n > \u001b[34mhttps://opencollective.com/preact/donate\u001b[0m')"

       Love Preact? You can now donate to our open collective:
        > https://opencollective.com/preact/donate
       added 96 packages from 95 contributors and audited 6608 packages in 7.591s
       found 0 vulnerabilities

       Running heroku-postbuild

       > [email protected] heroku-postbuild /tmp/build_aba62cec9b0ecc274830e615862f4fe3
       > next build

internal/modules/cjs/loader.js:583
    throw err;
    ^
Error: Cannot find module './webpack-config'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:581:15)
    at Function.Module._load (internal/modules/cjs/loader.js:507:25)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at Object.<anonymous> (/tmp/build_aba62cec9b0ecc274830e615862f4fe3/node_modules/next/dist/build/index.js:10:42)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] heroku-postbuild: `next build`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] heroku-postbuild script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /tmp/npmcache.jn2Lb/_logs/2019-02-28T06_02_12_138Z-debug.log
-----> Build failed

       We're sorry this build is failing! You can troubleshoot common issues here:
       https://devcenter.heroku.com/articles/troubleshooting-node-deploys

       Some possible problems:

       - node_modules checked into source control
         https://blog.heroku.com/node-habits-2016#9-only-git-the-important-bits

       Love,
       Heroku

Any thoughts?

[Deelux]

"scripts": {
 "prestart": "next build",
 "start": "next start -p ${PORT}",
}

@dotcypress 's solution above allowed me to finally at least load my home page... but if I go to any other route than '/', I get this error. It seems I can load the files fine, but I get a 500 error on the route?

"scripts": {
 "prestart": "next build",
 "start": "next start -p ${PORT}",
}

@dotcypress 's solution above allowed me to finally at least load my home page... but if I go to any other route than '/', I get this error. It seems I can load the files fine, but I get a 500 error on the route?

This was the only one that actually worked for me.
So if you have this error, add this:

"heroku-postbuild": "next build",
"start": "next start -p $PORT"

Cheers