capacitor-plugin-upgrade-v4-to-v5
Upgrades a Capacitor plugin library from v4 to v5 using npx @capacitor/plugin-migration-v4-to-v5@latest, then the manual checklist - @capacitor/ dev deps to latest-5, compile/target SDK 33 defaults, AGP 8.0.0, Gradle 8.0.2, namespace in build.gradle instead of manifest package, Java 17, Jetifier removal, Kotlin 1.8.20 with kotlin-stdlib, plus code changes - CAPBridgedPlugin requirements moved to instance level (pluginId - identifier, pluginMethods typed [CAPPluginMethod]) and Android PluginCall.getObject() / getArray() may return null. Use when a plugin's peer dependency is Capacitor 4 and it must support 5, or apps on v5 fail with "Namespace not specified" in the plugin module. Do not use for app upgrades, other major versions, or non-Capacitor libraries.
- Installs
- 637
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/cap-go/capgo-skills --skill capacitor-plugin-upgrade-v4-to-v5- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads capacitor-plugin-upgrade-v4-to-v5 automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Capacitor Plugin Upgrade v4 to v5
Move a plugin library to Capacitor 5. Source of truth: https://capacitorjs.com/docs/updating/plugins/5-0
When to Use
- Snapshot shows
@capacitor/core4.x in peer/dev deps and the plugin must work in Capacitor 5 apps. - A Capacitor 5 app fails building this plugin with
Namespace not specifiedor Java 17 errors. - The plugin manually conforms to
CAPBridgedPluginor callsgetObject()/getArray().
Do not use:
- Upgrading an app ->
capacitor-app-upgrade-v4-to-v5. - Plugin already on 5 ->
capacitor-plugin-upgrade-v5-to-v6. Multi-hop ->capacitor-plugin-upgrades.
Live Project Snapshot
Plugin and Capacitor package snapshot:
!node -e "const fs=require('fs');if(!fs.existsSync('package.json'))process.exit(0);const pkg=JSON.parse(fs.readFileSync('package.json','utf8'));const out=['package.name='+(pkg.name||''),'package.version='+(pkg.version||'')];for(const section of ['peerDependencies','dependencies','devDependencies']){for(const [name,version] of Object.entries(pkg[section]||{})){if(name.startsWith('@capacitor/'))out.push(section+'.'+name+'='+version)}}console.log(out.join('\n'))"
Example and native project paths:
!find . -maxdepth 3 \( -path './example-app' -o -path './ios' -o -path './android' \)
References
| File | Load when |
|---|---|
references/android.md | Applying Gradle, manifest, Java or Kotlin changes by hand |
Preflight
| Tool | Minimum |
|---|---|
| Node.js | 16+ |
| Xcode | 14.1+ |
| Java | 17 (AGP 8) |
| AGP / Gradle | 8.0.0 / 8.0.2 |
| Android SDK defaults | compileSdk 33, targetSdk 33, minSdk 22 |
| iOS deployment target | 13.0 (unchanged) |
Procedure
-
Confirm the plugin is on 4.x from the snapshot and the tree is clean (
git status). -
From the plugin root run:
npx @capacitor/plugin-migration-v4-to-v5@latestIt edits
package.json,android/build.gradle, the wrapper,gradle.properties, and the manifest. Reviewgit diff. -
Finish manually anything not applied (
references/android.md):@capacitor/cli,core,android,iosdev deps tolatest-5; peer@capacitor/coreto^5.0.0.- SDK defaults 33, AGP 8.0.0, Gradle 8.0.2,
namespaceinandroid {}and nopackage=in the manifest, Java 17, Jetifier removed, Kotlin 1.8.20 withkotlin-stdlib.
-
iOS code: if the plugin conforms to
CAPBridgedPluginmanually (noCAP_PLUGINmacro), move requirements to instance level, renamepluginIdtoidentifier, typepluginMethodsas[CAPPluginMethod], and dropgetMethod(_:). Macro-based plugins need no change. -
Android code:
call.getObject(key)andcall.getArray(key)can now returnnull. Add null checks andcall.reject(...)with a clear message when required. -
Update the example app (if present) to Capacitor 5 via
capacitor-app-upgrade-v4-to-v5. -
Bump the plugin major version and note "Requires Capacitor 5" in the changelog/README.
Verification
grep -n "\"@capacitor/" package.json # 5.x everywhere
grep -n "package=" android/src/main/AndroidManifest.xml # expect none
grep -n "namespace\|VERSION_17\|gradle:8.0.0" android/build.gradle
grep -rn "kotlin-stdlib-jdk" android/build.gradle # expect none
grep -rn "getObject(\|getArray(" android/src/main/ # each result null-checked
grep -rn "pluginId\b" ios/ # only CAPPlugin usages remain
npm run build
npm run verify # plugin template script: verify:ios + verify:android + verify:web, if present
cd android && ./gradlew clean build test
Run the example app on both platforms and exercise every method.
Error Handling
| Error | Fix |
|---|---|
Namespace not specified | Add namespace "<package>" to android {} in the plugin build.gradle. |
Android Gradle plugin requires Java 17 to run | Switch the Gradle JDK to 17. |
NullPointerException from getObject/getArray | Add null checks (step 5). |
Swift: type does not conform to protocol CAPBridgedPlugin | Use instance-level identifier, jsName, pluginMethods, or switch to the macro. |
Duplicate class ... kotlin-stdlib-jdk8 | Replace kotlin-stdlib-jdk7/jdk8 with kotlin-stdlib. |
FAQ
What does the capacitor-plugin-upgrade-v4-to-v5 skill do?
Upgrades a Capacitor plugin library from v4 to v5 using npx @capacitor/plugin-migration-v4-to-v5@latest, then the manual checklist - @capacitor/ dev deps to latest-5, compile/target SDK 33 defaults, AGP 8.0.0, Gradle 8.0.2, namespace in build.gradle instead of manifest package, Java 17, Jetifier removal, Kotlin 1.8.20 with kotlin-stdlib, plus code changes - CAPBridgedPlugin requirements moved to instance level (pluginId - identifier, pluginMethods typed [CAPPluginMethod]) and Android PluginCall.getObject() / getArray() may return null. Use when a plugin's peer dependency is Capacitor 4 and it must support 5, or apps on v5 fail with "Namespace not specified" in the plugin module. Do not use for app upgrades, other major versions, or non-Capacitor libraries.
How do I install capacitor-plugin-upgrade-v4-to-v5?
Run npx skills add https://github.com/cap-go/capgo-skills --skill capacitor-plugin-upgrade-v4-to-v5 in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/capacitor-plugin-upgrade-v4-to-v5/ (personal) or .claude/skills/capacitor-plugin-upgrade-v4-to-v5/ (project).
Which AI agents can use capacitor-plugin-upgrade-v4-to-v5?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is capacitor-plugin-upgrade-v4-to-v5 safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains capacitor-plugin-upgrade-v4-to-v5?
It is published by cap-go in cap-go/capgo-skills. It has 637 recorded installs.
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