after ionic v3 to ionic v5 migration - ionic build command not working

Question

We have migrated from ionic v3 to ionic v5 ... ionic serve command working but showing blank page when launched.

ionic build command throwing following error..

[11:57:17] ionic-app-script task: "build" [11:57:17] TypeError: Cannot read property 'compilation' of undefined TypeError: Cannot read property 'compilation' of undefined at DefinePlugin.apply (/Users/upgrade/node_modules/webpack/lib/DefinePlugin.js:280:18) at Compiler.apply (/Users/upgrade/node_modules/@ionic/app-scripts/node_modules/tapable/lib/Tapable.js:375:16) at webpack (/Users/upgrade/node_modules/@ionic/app-scripts/node_modules/webpack/lib/webpack.js:33:19) at /Users/upgrade/node_modules/@ionic/app-scripts/dist/webpack.js:132:24 at new Promise () at runWebpackFullBuild (/Users/upgrade/node_modules/@ionic/app-scripts/dist/webpack.js:113:12) at webpackWorker (/Users/upgrade/node_modules/@ionic/app-scripts/dist/webpack.js:70:19) at Object.webpack (/Users/upgrade/node_modules/@ionic/app-scripts/dist/webpack.js:29:12) at bundleWorker (/Users/upgrade/node_modules/@ionic/app-scripts/dist/bundle.js:13:22) at Object.bundle (/Users/upgrade/node_modules/@ionic/app-scripts/dist/bundle.js:6:12) [ERROR] An error occurred while running subprocess ionic-app-scripts.

    ionic-app-scripts build exited with exit code 1.
    
    Re-running this command with the --verbose flag may provide more information.

we need to use this project for all 3 platform i.e. browser, android and ios .. so for that purpose we need www folder with files. ionic build command achieve this.

how should i fix this ...

Answer 1

Create a new project using ionic 6, migrate cordova plugins to capacitor and copy over code. This is your best bet. Goodluck.