Actualicé mi aplicación Ionic 4 con estos dos comandos:
# Upgrading to Ionic 5 npm install @ionic/angular@latest @ionic/angular-toolkit@latest --save # Upgrading to Angular 9 ng update @angular/core @angular/cli Y cuando hice el ionic serve , comencé a recibir este error:
> ng run app:serve --host=localhost --port=8100 [ng] chunk {} 0.js, 0.js.map () 22.1 kB [rendered] [ng] chunk {common} common.js, common.js.map (common) 25.7 kB [rendered] [ng] [ng] ERROR in ./src/zone-flags.ts [ng] Module build failed (from ./node_modules/@ngtools/webpack/src/index.js): [ng] Error: /Users/shashank/Projects/my-app/mobile-app/src/zone-flags.ts is missing from the TypeScript compilation. Please make sure it is in your tsconfig via the 'files' or 'include' property. [ng] at AngularCompilerPlugin.getCompiledFile (/Users/shashank/Projects/my-app/mobile-app/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:909:23) [ng] at plugin.done.then (/Users/shashank/Projects/my-app/mobile-app/node_modules/@ngtools/webpack/src/loader.js:41:31) [ng] at process._tickCallback (internal/process/next_tick.js:68:7)La solución es cambiar la siguiente línea en mobile-app/src/polyfills.ts :
Desde:
import './zone-flags.ts';Para:
import './zone-flags';