# Mooncheat

> Moonbit cheatsheet to check syntax and corelibrary usages

- Skill: `majiayu000/mooncheat` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/mooncheat`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/mooncheat/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/mooncheat

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- See [syntax.mbt.md](./syntax.mbt.md) to check moonbit syntax
- Search builtin APIs
  - Grep `~/.moon/lib/core` to check syntax details.
  - MoonDoc: `moon doc ArrayView`, `moon doc Array*`
- Grep `.mooncakes/` to check library usages.
  - username/pkg/(src/)?pkg.generated.mbti
- Configuration
  - moon.pkg.json
    - See https://docs.moonbitlang.com/en/latest/toolchain/moon/package.html
    - moon.pkg.json's jsonschema https://raw.githubusercontent.com/moonbitlang/moon/71abb232f9b661c079246a85a19ff8fe3421170a/crates/moonbuild/template/pkg.schema.json
  - moon.mod.json
    - See https://docs.moonbitlang.com/en/latest/toolchain/moon/module.html
    - moon.mod.json's jsonschema https://raw.githubusercontent.com/moonbitlang/moon/71abb232f9b661c079246a85a19ff8fe3421170a/crates/moonbuild/template/mod.schema.json
  - `moon check` warning and alert configuration
    - Get warning list by `moonc build-package -warn-help`
  - cross target build
    - [xplat-build.md](./xplat-build.md)
- Writing benchmark https://docs.moonbitlang.com/en/latest/language/benchmarks.html