Node engine check

This is a drop-in module to enforce the node engine version specified in your project's package.json.

Usage

Add an "engines" section to your package.json, if you don't have it already.

{
  "name": "my-app",
  ...
  "engines": {
    "node": ">=4.0"
  }
}

Add this to the entry point of your node app:

// index.js
require('engine-check')()
console.log('Hello node >=4.0!')

And then run your app with the correct version of node:

bash$ node -v
v4.3.1

bash$ node index.js
Hello node >=4.0!

bash$ echo $?
0

Or with an outdated one:

bash$ node -v
v0.12.10

bash$ node index.js
Detected node version: 0.12.10. Required node version: >=4.0.

bash$ echo $?
1

Note: the warning is sent to STDERR. If you'd rather not have any output, you can set the silent option:

// index.js
require('engine-check')({ silent: true })
console.log('Hello node >=4.0!')

bash$ node -v
v0.12.10

bash$ node index.js

bash$ echo $?
1

Available options

• silent (default: false)
  • when true, completely disables all STDERR output
• debug (default: false)
  • when true, STDERR output becomes more verbose
• searchRoot (default: the dirname of the main module)
  • where to start searching for the project's package.json
  • use with caution

Caveats

Currently only the "node" engine is checked.

License

Copyright (c) 2016, Peter-Paul van Gemerden. Distributed under the ISC license (see the LICENSE file).