next-source-maps only generates server's source map

[lucasfeliciano]

I've added next-source-maps to my project however it is only generating the map to the server.
I could have some help here since I don't know if i'm doing something wrong or if it is a bug on the plugin.

source-maps.js

const webpack = require('webpack')
const withSourceMaps = require('@zeit/next-source-maps')

module.exports = (nextConfig = {}) => {
  return Object.assign(
    {},
    nextConfig,
    withSourceMaps({
      webpack(config, options) {
        const { dev, isServer, buildId } = options
        if (!dev) {
          config.plugins.push(
            new webpack.DefinePlugin({
              'process.env.SENTRY_RELEASE': JSON.stringify(buildId),
            })
          )
        }
        if (!isServer) {
          config.resolve.alias['@sentry/node'] = '@sentry/browser'
        }
        return config
      },
    })
  )
}

next.config.js

const withPlugins = require('next-compose-plugins')
const withSourceMaps = require('./plugins/source-maps')

module.exports = withPlugins(
  [withSourceMaps],
  {
    // my next config
  }
)

I'm using next@7.0.2
If I import the next plugin like the documentation:
const withSourceMaps = require('@zeit/next-source-maps')()

I get an error saying that withSourceMaps is not a function.

So I have to import without the function call and this is the result:

Static files

Server files

[bhurlow]

I'm seeing the same

[bhurlow]

the issue appears to be here: https://github.com/zeit/next.js/blob/canary/packages/next/build/webpack-config.js#L75

and here https://github.com/zeit/next.js/blob/canary/packages/next/build/webpack-config.js#L189

[lucasfeliciano]

I realised that is because the working version of next-source-maps is on the canary branch.

So I had to install it like npm i @zeit/next-source-maps@0.0.4-canary.1

After that it is working.

When are you guys planing to release it ?

[davydkov]

I have next@8.0.3 and @zeit/next-source-maps@0.0.4-canary.1

next.config.js

const withPlugins = require('next-compose-plugins');
const typescript = require('@zeit/next-typescript')
const less = require('@zeit/next-less')
const sourceMaps = require('@zeit/next-source-maps')

module.exports = withPlugins([
  [sourceMaps],
  [less, {
    cssModules: true,
    cssLoaderOptions: {
      importLoaders: 1,
    },
  }],
  [typescript],
]);

No source maps are generated for both server and client code

But sources are generated, if I remove this condition in sources of next-source-maps:
https://github.com/zeit/next-plugins/blob/6786c6c431d896757b870f112f89e1fcf7ac7ae6/packages/next-source-maps/index.js#L13

I don't do PR, as, be honest, I don't know what is the impact

[cryptiklemur]

I actually get heap of out memory errors with 0.0.4

<--- Last few GCs --->

[251:0x5587163d8320]   666772 ms: Mark-sweep 1379.1 (1445.2) -> 1379.1 (1446.2) MB, 802.3 / 0.0 ms  allocation failure GC in old space requested
[251:0x5587163d8320]   667575 ms: Mark-sweep 1379.1 (1446.2) -> 1379.1 (1415.2) MB, 802.6 / 0.0 ms  last resort GC in old space requested
[251:0x5587163d8320]   668381 ms: Mark-sweep 1379.1 (1415.2) -> 1379.1 (1415.2) MB, 805.3 / 0.0 ms  last resort GC in old space requested


<--- JS stacktrace --->

==== JS stack trace =========================================

Security context: 0x1758b47a57c1 <JSObject>
    0: builtin exit frame: lastIndexOf(this=0x1133992b7569 <Very long string[3799404]>,0x1a802228b8d1 <String[1]\: \n>)

    1: G(aka G) [/tmp/1797e0ae/client/node_modules/terser/dist/bundle.min.js:1] [bytecode=0x18da51d63129 offset=15](this=0x1d52b18022d1 <undefined>)
    2: /* anonymous */(aka /* anonymous */) [/tmp/1797e0ae/client/node_modules/terser/dist/bundle.min.js:1] [bytecode=0xc5c07326...

[jordan-jarolim]

I have the same problem as @aequasi and I am not able to make this plugin work :/

[AdhamMoussa]

you guys shoud invoke the sourceMaps required like so:
const sourceMaps = require('@zeit/next-source-maps')()

[Squirre1]

@aequasi

I actually get heap of out memory errors with 0.0.4

Increase the default node max-old-space-size option

export NODE_OPTIONS="--max-old-space-size=4096"

[zen0wu]

0.0.4-canary.1 works for me. Just to put it here, since there's an API change between 0.0.3 and 0.0.4, which is really confusing

[wallynm]

Using cannary and the problem persists.
Tried to remove the code
https://github.com/zeit/next-plugins/blob/6786c6c431d896757b870f112f89e1fcf7ac7ae6/packages/next-source-maps/index.js#L13

And didnt worked also, static source maps don't get generated

[Mokto]

@wallynm 0.0.4-canary.1 works for me

[WoLfulus]

It's not working for me either. I'm doing static export

@wallynm did you solve this?

[wallynm]

Nope, didn't solve at all. What i've discovered is the server build folder is generating .map files, but the static ones don't.

I'm using custom next.js config with NodeJS. I can try to create an test repository if necessary, what's your configuration @WoLfulus?

Currently were using 9.0.6, i gonna test 9.0.7 to see if we had some improvement.

[WoLfulus]

I did manage to get this working, but I have no idea how.

Basically what I did was:

• Update to "@zeit/next-source-maps": "0.0.4-canary.1"
• const withSourceMaps = require("@zeit/next-source-maps")();
• module.exports = withSourceMaps({ config })

But I'm pretty sure it didn't work from the start. Maybe it had something to do with .next folder, I deleted .next folder and built it again making sure to pass NODE_ENV=production

After that I was able to see .map files in dist folder.

[wallynm]

Using @zeit/next-source-maps": "0.0.4-canary.1

I'm currently using this config at export:

const withSourceMaps = require("@zeit/next-source-maps")

const configNext = {
    ...
}

module.exports = withPlugins([
  [withSourceMaps],
  [withTM, withTranspileModules],
  [withBundleAnalyzer, configBundleAnalyzer],
  withSass
], configNext)

[wallynm]

@WoLfulus i don't know if it's right but after seeing your updates i've auto-executed withSourceMaps() config before export and it generated my sourcemaps, still need to see if they are corrected mapped all methods, but at least generated .map files.

Updated config:

module.exports = withPlugins([
  [withTM, withTranspileModules],
  [withBundleAnalyzer, configBundleAnalyzer],
  withSass,
  withSourceMaps()
], configNext)

Before i was exporting without execute withSourcemaps method.

[WoLfulus]

Yeah, you should execute (in my case I executed it just after the require call. Executing it returns a new function which is meant to be the plugin itself (I had to dig into the code to see what was happening)

Glad it worked out ;)

[elsigh]

Upgrading to the 0.0.4 canary and using like:
const withSourceMaps = require("@zeit/next-source-maps")(); then wrapping my config (pretty weird syntax) worked for me.

[afsanefdaa]

const sourceMaps = require('@zeit/next-source-maps')()

why is that ? it's weird!