A module to run Deno scripts from Node.js, including functionalities for downloading Deno and executing Deno scripts.
Run Deno scripts from Node.js with automatic Deno management, permission control, and ephemeral script execution. 🦕➡️📦
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``bash`
npm install @push.rocks/smartdenoor
pnpm add @push.rocks/smartdeno
`typescript
import { SmartDeno } from '@push.rocks/smartdeno';
const smartDeno = new SmartDeno();
// Start SmartDeno (downloads Deno if needed)
await smartDeno.start();
// Execute a Deno script
const result = await smartDeno.executeScript(console.log("Hello from Deno!"));
console.log(result.stdout); // "Hello from Deno!"
console.log(result.exitCode); // 0
// Clean up when done
await smartDeno.stop();
`
#### Start Options
`typescript`
await smartDeno.start({
// Force download a local copy of Deno even if it's in PATH
forceLocalDeno: true,
});
Control what your Deno scripts can access using the permissions option:
`typescriptconst response = await fetch("https://api.example.com/data");
// Allow network access
const result = await smartDeno.executeScript(
console.log(await response.text());,
{ permissions: ['net'] }
);
// Allow environment variable access
const envResult = await smartDeno.executeScript(
console.log(Deno.env.get("HOME")),
{ permissions: ['env'] }
);
// Allow all permissions (use with caution! ⚠️)
const fullResult = await smartDeno.executeScript(
// Script with full access,`
{ permissions: ['all'] }
);
#### Available Permissions
| Permission | Description |
|------------|-------------|
| all | Grant all permissions (-A flag) |env
| | Environment variable access |ffi
| | Foreign function interface |hrtime
| | High-resolution time measurement |net
| | Network access |read
| | File system read access |run
| | Subprocess execution |sys
| | System information access |write
| | File system write access |
The executeScript method returns detailed execution information:
`typescriptconsole.log("test")
const result = await smartDeno.executeScript();
console.log(result.exitCode); // 0 for success, non-zero for errors
console.log(result.stdout); // Standard output
console.log(result.stderr); // Standard error output
`
`typescriptthrow new Error("Something went wrong")
// Scripts that throw errors return non-zero exit codes
const result = await smartDeno.executeScript();
if (result.exitCode !== 0) {
console.error('Script failed:', result.stderr);
}
// Attempting to execute before starting throws an error
try {
const unstarted = new SmartDeno();
await unstarted.executeScript(console.log("test"));`
} catch (error) {
console.error(error.message); // "SmartDeno is not started. Call start() first."
}
`typescript
const smartDeno = new SmartDeno();
// Check if running
console.log(smartDeno.isRunning()); // false
await smartDeno.start();
console.log(smartDeno.isRunning()); // true
// Execute scripts...
await smartDeno.stop();
console.log(smartDeno.isRunning()); // false
// Safe to call stop() multiple times
await smartDeno.stop(); // No error
`
Using SmartDeno in an Express server:
`typescript
import express from 'express';
import { SmartDeno } from '@push.rocks/smartdeno';
const app = express();
const smartDeno = new SmartDeno();
app.use(express.json());
// Initialize on startup
await smartDeno.start();
app.post('/execute', async (req, res) => {
const { script, permissions } = req.body;
try {
const result = await smartDeno.executeScript(script, { permissions });
res.json(result);
} catch (error) {
res.status(500).json({ error: error.message });
}
});
// Cleanup on shutdown
process.on('SIGTERM', async () => {
await smartDeno.stop();
process.exit(0);
});
app.listen(3000);
`
SmartDeno works by:
1. 🦕 Deno Management — Automatically downloads the latest Deno binary for your platform if not available or if forceLocalDeno is setdeno run -
2. 💾 In-Memory Execution — Scripts < 2MB are executed via stdin (), staying fully in-memory with no disk I/O
3. 📁 Large Script Support — Scripts >= 2MB automatically use a temp file (cleaned up after execution)
4. 🔒 Permission Control — Translates permission options to Deno's security flags
#### Constructor
`typescript`
const smartDeno = new SmartDeno();
#### Methods
| Method | Description |
|--------|-------------|
| start(options?) | Initialize SmartDeno (downloads Deno if needed) |stop()
| | Stop SmartDeno instance |isRunning()
| | Check if SmartDeno is currently running |executeScript(script, options?)
| | Execute a Deno script |
`typescript
interface ISmartDenoOptions {
forceLocalDeno?: boolean;
}
interface IExecuteScriptOptions {
permissions?: TDenoPermission[];
}
type TDenoPermission =
| 'all'
| 'env'
| 'ffi'
| 'hrtime'
| 'net'
| 'read'
| 'run'
| 'sys'
| 'write';
``
This repository contains open-source code licensed under the MIT License. A copy of the license can be found in the LICENSE file.
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