ionic cordova build --prod TypeError on ionic-app-script task: "build" postprocess

I'm submitting a ... (check one with "x") [ x] bug report [ ] feature request

Current behavior:

.... [13:11:38] ionic-app-script task: "build" [13:11:38] TypeError: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined at Object.writeFileSync (fs.js:1521:5) at C:\Users\Ruben\Projectes\zinkolas-app-order-processing\node_modules\@ionic\app-scripts\dist\postprocess.js:48:20 at Array.forEach () at writeFilesToDisk (C:\Users\Ruben\Projectes\zinkolas-app-order-processing\node_modules\@ionic\app-scripts\dist\postprocess.js:36:11) at postprocessWorker (C:\Users\Ruben\Projectes\zinkolas-app-order-processing\node_modules\@ionic\app-scripts\dist\postprocess.js:26:23) at Object.postprocess (C:\Users\Ruben\Projectes\zinkolas-app-order-processing\node_modules\@ionic\app-scripts\dist\postprocess.js:13:12) at C:\Users\Ruben\Projectes\zinkolas-app-order-processing\node_modules\@ionic\app-scripts\dist\build.js:131:30 at processTicksAndRejections (internal/process/task_queues.js:95:5)

Expected behavior:

I hope that the build finish successfully.

Steps to reproduce:

ionic cordova build android --prod

npm run build --prod --> ionic-app-scripts build

Related code:

I have analized postprocess.js script and add the next code to print the possible problem:

 if(!file.content){
          console.log(file)
          console.log(file.path)
          console.log(fileToWrite);
        }

The result is:

path: 'C:\Users\Ruben\Projectes\zinkolas-app-order-processing\node_modules\ionic-angular\config\mode-registry.js.map', content: undefined, timestamp: 1638360677667 C:\Users\Ruben\Projectes\zinkolas-app-order-processing\node_modules\ionic-angular\config\mode-registry.js.map C:\Users\Ruben\Projectes\zinkolas-app-order-processing.tmp\node_modules\ionic-angular\config\mode-registry.js.map

This file exists and i can load it with other script. I don't know if it happens with other files.

Other information:

It don't fail with ionic cordova build android or npm run build
--prod is the problem

Ionic info: (run ionic info from a terminal/cmd prompt and paste output below):

[WARN] Detected locally installed Ionic CLI, but it's too old--using global CLI.

Ionic:

   Ionic CLI          : 6.4.0 (C:\Users\Ruben\AppData\Roaming\npm\node_modules\@ionic\cli)
   Ionic Framework    : ionic-angular 3.9.2
   @ionic/app-scripts : 3.2.4

Cordova:

   Cordova CLI       : 10.0.0 (cordova-lib@10.1.0)
   Cordova Platforms : android 9.1.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 1.2.1, (and 8 other plugins)

Utility:

   cordova-res : 0.15.3
   native-run  : 0.3.0

System:

   Android SDK Tools : 26.1.1 (C:\Users\Ruben\AppData\Local\Android\Sdk)
   NodeJS            : v14.18.1 (C:\PROGRA~1\nodejs\node.exe)
   npm               : 6.14.15
   OS                : Windows 10

I don't know if it's important but i have own Webpack:

var path = require('path');
var useDefaultConfig = require('@ionic/app-scripts/config/webpack.config.js');

module.exports = function () {
    console.log("Environment: " + process.env.IONIC_ENV);
    useDefaultConfig[process.env.IONIC_ENV].resolve.alias = {
        "@environment": path.resolve(__dirname + '/../../src/env/env.' + process.env.IONIC_ENV + '.ts'),
    };
    return useDefaultConfig;
};

ionic-team / ionic-v3

ionic cordova build --prod TypeError on ionic-app-script task: "build" postprocess #1148