# Melonjs 20 Migration (agent skill)

> Melonjs 20 Migration is an agent skill (a SKILL.md file) from melonjs/melonJS. Agents load it when writing melonJS code that may be based on pre-20.x knowledge, when migrating a game from melonJS 19.x or earlier, or when an API you expected… It works with Claude Code and has 6,419 GitHub stars across a repository of 4 listed skills.

Use this skill when writing melonJS code that may be based on pre-20.x knowledge, when migrating a game from melonJS 19.x or earlier, or when an API you expected does not exist. Covers the mandatory async Application.init(), the WebGL 2 baseline and WebGPU backend, renderable post effects replacing the shader property, and the deprecated exports still present. Triggers on: migration, upgrade, melonJS 19, me.game, me.video.init, renderable.shader, Compositor, CanvasTexture, me.Math, deprecated.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/melonjs/melonJS |
| Skill path | packages/melonjs/skills/melonjs-20-migration/SKILL.md |
| Skill name | melonjs-20-migration |
| GitHub stars | 6,419 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 4 |
| Plugin marketplace | melonjs |
| Official | yes |
| Works with | Claude Code |
| Category | Coding |
| Last commit | Oct 26, 2026 |

## When it triggers

- Use this skill when writing melonJS code that may be based on pre-20.
- Triggers on: migration, upgrade, melonJS 19, me.

## Add this skill

### Claude Code

```sh
/plugin marketplace add melonjs/melonJS
/plugin install melonjs@melonjs
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/melonjs/melonJS.git
cp -r melonJS/packages/melonjs/skills/melonjs-20-migration .agents/skills/melonjs-20-migration   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/melonjs/melonJS.git
cp -r melonJS/packages/melonjs/skills/melonjs-20-migration .cursor/skills/melonjs-20-migration   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

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Canonical page: https://appsgit.com/skills/melonjs-20-migration
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