CLAUDE.md@deno/core git:20260510.79e3b50A

Immutable. This exact content is served forever at /api/v1/blob/ca54edd014ed87af.

# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Commands

### Build and Development
```bash
# Build the project
deno task build

# Publish to both Deno (JSR) and NPM
deno task publish

# Publish to JSR only
deno task publish:deno

# Publish to NPM only (from ../../packages/core)
deno task publish:npm
```

### Testing
```bash
# Run tests (uses Deno's built-in test runner)
deno test

# Run specific test file
deno test path/to/test.ts
```

### Type Checking and Linting
```bash
# Type check (Deno has built-in TypeScript support)
deno check mod.ts

# Format code
deno fmt

# Lint code
deno lint
```

## Architecture Overview

This is the core library for the SKMTC (Schema Kit Mapping & Type Conversion) project, a TypeScript/Deno-based OpenAPI schema processor that generates code artifacts from OpenAPI v3 documents.

### Core Processing Pipeline

The system follows a three-phase pipeline orchestrated by `CoreContext`:

1. **Parse Phase** (`ParseContext`): Converts OpenAPI v3 JSON documents into internal OAS (OpenAPI Schema) objects
2. **Generate Phase** (`GenerateContext`): Transforms OAS objects into generator-specific artifacts using pluggable generators
3. **Render Phase** (`RenderContext`): Renders artifacts to files with formatting (Prettier) and file system operations

### Key Architectural Components

- **Context System**: Three context classes manage the pipeline phases with logging, tracing, and error handling
- **DSL Layer**: Domain-specific language for code generation. The abstract root `SnippetBase` has two specializations: **Projections** (`ModelProjectionBase`, `OasOperationProjectionBase`, `GqlOperationProjectionBase`) — named, exportable artifacts wrapped in a `Definition` — and **Snippets** — anonymous, embedded values whose `toString()` is spliced into a Projection's body.
- **OAS Processing**: Comprehensive OpenAPI v3 schema handling with advanced features like `allOf` merging and schema validation
- **Generator System**: Pluggable architecture for different output targets (models, operations, etc.)
- **Type System**: Strong TypeScript typing throughout with branded types and validation using Valibot

### Directory Structure

- `context/` - Pipeline orchestration and execution contexts
- `dsl/` - Code generation DSL and content builders
- `oas/` - OpenAPI schema processing and transformations
- `run/` - Main execution entry points (`toArtifacts`, `toV3JsonDocument`)
- `types/` - Type definitions and branded types
- `helpers/` - Utilities for naming, tracing, and string manipulation
- `typescript/` - TypeScript-specific code generation utilities

### Key Entry Points

- `mod.ts` - Main module exports
- `run/toArtifacts.ts` - Primary transformation function
- `context/CoreContext.ts` - Main orchestration class

### Advanced Features

- **Schema Merging**: Complex `allOf` merging with conflict detection in `oas/_merge-all-of/`
- **Generator Plugins**: Extensible generator system with enrichment support
- **Brand Types**: Type-safe identifiers and references using TypeScript branded types

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# Recent Activity

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### May 6, 2026

| ID | Time | T | Title | Read |
|----|------|---|-------|------|
| #18751 | 11:07 AM | ✅ | Configured all monorepo packages to publish to local JSR instance | ~480 |
| #18750 | 11:05 AM | 🔴 | Pin JSR publish URL to local registry but introduced spacing error in core package | ~344 |

### May 9, 2026

| ID | Time | T | Title | Read |
|----|------|---|-------|------|
| #19899 | 9:23 AM | 🔵 | SKMTC generator skill structure and core architecture examined | ~550 |
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