Ionic App Upgrade

Prerequisites

Procedures

Step 1: Detect Current Version

@ionic/angular

@ionic/react

@ionic/vue

package.json

dependencies

devDependencies

Step 2: Execute Upgrade

references/upgrade-v4-to-v5.md

references/upgrade-v5-to-v6.md

references/upgrade-v6-to-v7.md

references/upgrade-v7-to-v8.md

1. Read and apply

   references/upgrade-v5-to-v6.md

2. Build the project (

   npm run build

   ), fix any errors, and verify the app runs
3. Read and apply

   references/upgrade-v6-to-v7.md

4. Build the project (

   npm run build

   ), fix any errors, and verify the app runs
5. Read and apply

   references/upgrade-v7-to-v8.md

6. Build the project (

   npm run build

   ), fix any errors, and verify the app runs

Step 3: Final Verification

npm run build

npx cap sync

Error Handling

• If

  npm run build

  fails after an upgrade step, check the compiler errors. Most errors are caused by removed component properties, renamed CSS variables, or changed event handler signatures documented in the reference files.
• If Jest or unit tests fail, check the

  transformIgnorePatterns

  configuration — Ionic 6+ ships as ES Modules and requires Babel/Jest configuration updates.
• If CSS styles break after upgrade, check for removed CSS Shadow Parts and renamed CSS variables in the reference file for that version.
• If a multi-version upgrade fails mid-way, fix the current version step before proceeding to the next.
• If the project also uses Capacitor and platform builds fail, the Capacitor version may also need upgrading — use the

  capacitor-app-upgrades

  skill.

Related Skills

• capacitor-app-upgrades

  — If Capacitor also needs upgrading alongside Ionic, use this skill for the Capacitor-specific upgrade steps.

• ionic-app-development

  — General Ionic development guidance.

• capacitor-plugins

  — For installing or reconfiguring plugins after the app upgrade.