creating-modules

Development

Creates new modules within existing packages following project conventions. Handles file structure, barrel exports, namespace files, package.json imports/exports, and internal import patterns.

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How to use this skill

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/creating-modules-jasonkuhrt-kitz/SKILL.md

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Creating Modules

Steps

Create module directory: packages/<pkg>/src/<module-name>/
Create implementation files: <module-name>.ts or split across multiple files

Create barrel file __.ts:

export * from './implementation.js'
export type * from './types.js'

Create namespace file _.ts:
```
export * as ModuleName from './__.js'
```

Add to package.json imports:

{
  "imports": {
    "#module-name": "./build/module-name/_.js",
    "#module-name/*": "./build/module-name/*.js"
  }
}

Add to package.json exports:

{
  "exports": {
    "./module-name": "./build/module-name/__.js"
  }
}

Sync tsconfig paths (run syncing-tsconfig-paths skill script)
Add to main exports in src/index.ts:
```
export * from '#module-name'
```

Reference

Module Structure

src/module-name/
├── _.ts              # Namespace file - exports the namespace
├── _.test.ts         # Module tests
├── __.ts             # Barrel file - exports all functions/types
└── *.ts              # Implementation files

Import System

Use # imports for internal module references within a package:

// Correct - use # imports
import { Fn } from '#fn'
import { Obj } from '#obj'

// Incorrect - don't use relative or package imports internally
import { Fn } from '../fn/_.js'
import { Obj } from '@kitz/core/obj'

Naming

Directory: kebab-case (group-by/)
Namespace export: PascalCase (GroupBy)
Functions: camelCase, no namespace prefix (by, not groupBy)

Notes

Each package defines its own # imports in package.json
Cross-package # imports are not valid - use package name imports