gaji 0.4.1

Overview

gaji is a CLI tool that allows developers to write GitHub Actions workflows in TypeScript with full type safety, then compile them to YAML. It automatically fetches action.yml definitions and generates typed wrappers, so you get autocomplete and type checking for every action input and output.

Features

• TypeScript-based workflow authoring with full type safety
• Automatic type generation from action.yml files
• Composite action and reusable workflow support
• File watching for development (--watch)
• Built-in QuickJS execution with npx tsx fallback
• GitHub Enterprise support
• Single binary distribution (Rust)

Installation

From npm

npm install -D gaji

From cargo

cargo install gaji

Quick Start

# Initialize a new project (creates workflows/ and generated/ directories)
gaji init

# Add actions and generate types
gaji add actions/checkout@v5
gaji add actions/setup-node@v4

# Run a one-time dev scan to generate types
gaji dev

# Build workflows to YAML
gaji build

Usage

Writing Workflows

Create TypeScript files in the workflows/ directory:

import { getAction, Job, Workflow } from "../generated/index.js";

const checkout = getAction("actions/checkout@v5");
const setupNode = getAction("actions/setup-node@v4");

const build = new Job("ubuntu-latest")
  .addStep(checkout({
    name: "Checkout code",
    with: { "fetch-depth": 1 },
  }))
  .addStep(setupNode({
    with: { "node-version": "22" },
  }))
  .addStep({ name: "Install dependencies", run: "npm ci" })
  .addStep({ name: "Run tests", run: "npm test" });

const workflow = new Workflow({
  name: "CI",
  on: {
    push: { branches: ["main"] },
    pull_request: { branches: ["main"] },
  },
}).addJob("build", build);

workflow.build("ci");

Run gaji build and it outputs .github/workflows/ci.yml.

Recommended Development Workflow

For the best experience, follow this workflow:

1. Start watch mode:

   gaji dev --watch
   

   Leave this running in a terminal. It will automatically generate types when you add new actions.

2. Edit your TypeScript workflows in workflows/*.ts:

   • Add or modify steps
   • Use getAction() with full type safety
   • Types are automatically generated for new actions

3. Build to YAML:

   gaji build
   

4. Review the generated YAML in .github/workflows/:

   • Verify commands are correct
   • Check that step order is as expected
   • Ensure all required fields are present

5. Commit both TypeScript and YAML:

   git add workflows/ .github/workflows/
   git commit -m "Update workflows"
   

Why Commit Both?

You should commit both the TypeScript source (workflows/*.ts) and the generated YAML (.github/workflows/*.yml):

• TypeScript: Source of truth for your workflows
• YAML: What GitHub Actions actually executes

⚠️ Important: Auto-compilation in CI

While you can create a workflow that auto-compiles TypeScript to YAML on push, this is NOT recommended. Always compile and review workflows locally before committing.

If you're willing to handle the complexity of GitHub Actions triggers (e.g., filtering paths, managing PAT tokens, avoiding infinite loops), you can set up an auto-compilation workflow. See workflows/update-workflows.ts for a working example.

Composite Actions

Define reusable composite actions and reference them in workflows:

import { CompositeAction, CallAction, Job, Workflow } from "../generated/index.js";

const action = new CompositeAction({
  name: "Setup",
  description: "Setup the project environment",
  inputs: {
    "node-version": { description: "Node.js version", required: false, default: "20" },
  },
});
action.addStep({ name: "Install deps", run: "npm ci", shell: "bash" });
action.build("setup");

// Reference the composite action in a workflow
const job = new Job("ubuntu-latest")
  .addStep(CallAction.from(action).toJSON());

const workflow = new Workflow({
  name: "CI",
  on: { push: {} },
}).addJob("build", job);

workflow.build("ci");

Reusable Workflows

Call reusable workflows using CallJob:

import { CallJob, Workflow } from "../generated/index.js";

const deploy = new CallJob("./.github/workflows/deploy.yml")
  .with({ environment: "production" })
  .secrets("inherit")
  .needs(["build"]);

const workflow = new Workflow({
  name: "Release",
  on: { push: { tags: ["v*"] } },
}).addJob("deploy", deploy);

workflow.build("release");

Job Options

The Job constructor accepts an optional second argument for additional configuration:

const job = new Job("ubuntu-latest", {
  needs: ["setup"],
  env: { NODE_ENV: "test" },
  "timeout-minutes": 30,
  "continue-on-error": true,
  permissions: { contents: "read" },
  strategy: {
    matrix: { node: ["18", "20", "22"] },
    "fail-fast": false,
  },
});

Builder methods are also available:

const job = new Job("ubuntu-latest")
  .addStep({ name: "Test", run: "npm test" })
  .needs(["setup"])
  .env({ CI: "true" })
  .when("github.event_name == 'push'")
  .permissions({ contents: "read" })
  .outputs({ result: "${{ steps.test.outputs.result }}" })
  .strategy({ matrix: { os: ["ubuntu-latest", "macos-latest"] } })
  .continueOnError(true)
  .timeoutMinutes(30);

Commands

gaji init

Initialize a new gaji project. Detects the project state (empty, existing project, or has YAML workflows) and sets up accordingly.

gaji init [OPTIONS]

gaji dev

Start development mode. Scans workflow files for action references and generates types.

gaji dev [OPTIONS]

gaji build

Build TypeScript workflows to YAML.

gaji build [OPTIONS]

Output files are placed in subdirectories based on type:

• Workflows: .github/workflows/<id>.yml
• Composite actions: .github/actions/<id>/action.yml

gaji add <action>

Add a new action and generate types.

gaji add actions/checkout@v5
gaji add actions/setup-node@v4

gaji clean

Clean generated files.

gaji clean [OPTIONS]

Configuration

.gaji.toml

Project-level configuration file. Created automatically by gaji init.

[project]
workflows_dir = "workflows"    # TypeScript workflow source directory
output_dir = ".github"         # Output directory for generated YAML
generated_dir = "generated"    # Directory for generated type definitions

[watch]
debounce_ms = 300              # Debounce delay for file watcher
ignored_patterns = ["node_modules", ".git", "generated"]

[build]
validate = true                # Validate workflow YAML (requires 'on' and 'jobs')
format = true                  # Format YAML output

[github]
token = "ghp_..."              # GitHub token (prefer .gaji.local.toml for this)
api_url = "https://github.example.com"  # GitHub Enterprise URL

.gaji.local.toml

Local overrides for sensitive values. Add this to .gitignore.

[github]
token = "ghp_your_token_here"
api_url = "https://github.example.com"  # for GitHub Enterprise

Token resolution priority: GITHUB_TOKEN env var > .gaji.local.toml > .gaji.toml

Documentation

📚 Full Documentation (English & 한국어)

• Getting Started
• Writing Workflows
• CLI Reference
• API Reference
• Examples

Examples

Check out the examples/ directory for complete working examples:

• ts-package - TypeScript package with gaji CI workflow using pnpm

License

MIT License