Individual skill
melonjs-20-migration
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.
packages/melonjs/skills/melonjs-20-migration/SKILL.md
Source commit a41d6a328557d69a0441d79bbeb9cd6c430275b5
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 5, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 6,440
- Repository last updated
- Nov 7, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- html5-game-engine Repository topic
- javascript-game-engine Repository topic
- 2d Repository topic
- agent-skills Repository topic
- canvas Repository topic
- contributions-welcome Repository topic
- game-development Repository topic
- game-framework Repository topic
- gamedev Repository topic
- gltf Repository topic
- writing Derived category
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SKILL.mdcore · 7,594 bytes
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# Migrating to melonJS 20.x
> What changed in melonJS 20.x, and which older APIs are gone, deprecated, or
> renamed. Read this before writing melonJS code from memory — much of what is
> published about melonJS predates 20.0.
**Why this skill exists:** most melonJS material in circulation describes 19.x or
earlier. Code written from that knowledge looks correct and fails at runtime.
The items below are ordered by how likely they are to be reproduced from memory.
## 1. `Application.init()` is mandatory and asynchronous
Since 20.0, constructing an `Application` no longer initialises it.
