Compact Core:compilation Tooling

Compilation Tooling

Complete guide to the Compact compiler (compactc), project organization, build workflows, and understanding compilation output.

Quick Reference

Basic Compilation

# Compile a contract
compactc contract.compact -o output/

# Compile with debug mode (faster, no ZK proofs)
compactc contract.compact -o output/ --skip-zk

# Generate VS Code language server support
compactc contract.compact -o output/ --vscode

Compiler Flags

Environment Variables

Output Artifacts

Compilation produces several output files:

output/
├── zkir/                    # Zero-knowledge intermediate representation
│   ├── circuit_name.zkir    # Circuit IR for each exported circuit
│   └── ...
├── keys/
│   ├── prover/              # Prover keys (for proof generation)
│   │   └── circuit_name.pk
│   └── verifier/            # Verifier keys (for on-chain verification)
│       └── circuit_name.vk
├── contract.ts              # TypeScript types and contract interface
├── witnesses.ts             # Witness type definitions
└── index.ts                 # Main export file

Development Workflow

1. Write Compact contract
2. Compile with --skip-zk for fast iteration
3. Run TypeScript tests
4. When ready: Full compile (generates ZK keys)
5. Deploy to testnet

Fast Development Loop

# Fast iteration (no proof generation)
compactc contract.compact -o build/ --skip-zk

# Full build for deployment
compactc contract.compact -o build/

Project Structure

Recommended project layout for Midnight DApps:

my-midnight-project/
├── contracts/
│   ├── main.compact           # Main contract entry point
│   ├── types.compact          # Shared type definitions
│   └── lib/                   # Helper modules
│       └── utils.compact
├── src/                       # TypeScript application code
│   ├── index.ts
│   ├── witnesses.ts           # Witness implementations
│   └── deploy.ts
├── build/                     # Compiled output (gitignored)
│   ├── zkir/
│   ├── keys/
│   └── *.ts
├── tests/
│   └── contract.test.ts
├── package.json
├── tsconfig.json
└── .env                       # Environment configuration

VS Code Integration

Generate language server support for VS Code:

compactc contract.compact -o build/ --vscode

This creates .vscode/ configuration for:

• Syntax highlighting
• Error diagnostics
• Type checking
• Go to definition

References

For detailed documentation:

• Compiler Usage - All compactc flags and options
• Project Structure - Recommended project layouts
• Output Artifacts - Understanding compiled output

Examples

Working project templates and scripts:

• Project Template - Complete starter project
• Build Scripts - Build, watch, and validation scripts