nhx

A hybrid of node ./script.js and npx package - run scripts or packages with automatic dependency handling.

• Self-contained scripts - Scripts declare their own dependencies and just work
• No project setup - No package.json, no npm install, no node_modules
• Share scripts easily - Send a single file that anyone can run
• Fast - Dependencies are cached globally, subsequent runs are instant
• Works offline - Once cached, no network needed

--with <dep>       Add a dependency (repeatable, supports @version)
--engine <spec>    Node version (e.g. node:18, node:>=16)
--run-postinstall  Allow postinstall scripts (disabled by default)
-h, --help         Show help

All other flags pass through to node.

# Run an npm package
nhx cowsay hello

# Run a local script (dependencies installed automatically)
nhx ./script.js

# Add a dependency for a script
nhx --with=lodash ./script.js

# Pin a specific version
nhx --with=chalk@4.1.2 ./script.js

# Use a specific node version
nhx --engine=node:18 ./script.js

# Pipe from stdin
curl -s https://example.com/script.js | nhx -

# All node flags work
nhx -e 'console.log(1)'
nhx --check ./script.js

Scripts can declare their own dependencies inline:

// hello.mjs
/*/ // <package>
{ dependencies: { chalk: "^5.0.0" } }
/*/ // </package>

import chalk from 'chalk';
console.log(chalk.green('Hello!'));

Dependencies are installed automatically on first run and cached for future runs.

/*/ // <package>
{ engines: { node: ">=18 <21" } }
/*/ // </package>

console.log(process.version);

If your current node satisfies the range, it's used directly. Otherwise nhx downloads an appropriate version.

Use tsx as a declared dependency and as a loader:

#!/usr/bin/env -S nhx --with=tsx --import tsx
import { something } from './other.ts';

You can also do that with inline dependencies:

#!/usr/bin/env -S nhx --import tsx
/*/ // <package>
{ devDependencies: { tsx: "^4" } }
/*/ // </package>

MIT