Capacitor Plugin Migration

Migrate a Capacitor plugin to a newer major version (4→5, 5→6, 6→7, or 7→8).

Prerequisites

Target Version	Node.js
5	16+
6	18+
7	20+
8	22+

The project must be a Capacitor plugin (not an app project).

Procedures

Step 1: Detect Current Version

Read @capacitor/core version from package.json (devDependencies or peerDependencies). Determine the current major version.

Ask the user for the target version. Default to the latest (8) if not specified.

Step 2: Execute Migration

For each major version jump between the current and target version, apply the corresponding migration guide sequentially:

Current → Target	Reference
4 → 5	references/migration-v4-to-v5.md
5 → 6	references/migration-v5-to-v6.md
6 → 7	references/migration-v6-to-v7.md
7 → 8	references/migration-v7-to-v8.md

For multi-version jumps (e.g., 5 → 8), apply each migration in order:

1. Read and apply references/migration-v5-to-v6.md
2. Run npm install && npx cap sync, build, and verify the plugin's test/example app
3. Read and apply references/migration-v6-to-v7.md
4. Run npm install && npx cap sync, build, and verify the plugin's test/example app
5. Read and apply references/migration-v7-to-v8.md
6. Run npm install && npx cap sync, build, and verify the plugin's test/example app

Do not skip intermediate versions.

Step 3: Final Verification

After completing all migration steps:

npm install
npx cap sync

Build the plugin's test/example app on both platforms to verify.

Error Handling

• If automated migration tools fail, check the terminal output for which steps failed and apply those manually using the steps in the corresponding reference file.
• If Android build fails after migration, run Tools > AGP Upgrade Assistant in Android Studio.
• If iOS build fails, verify the deployment target matches the target version requirements in the reference file.
• If Gradle property syntax warnings appear (v8+), search all .gradle files for property assignments without = and update them.
• If a multi-version migration fails mid-way, fix the current version step before proceeding to the next.