npm package.json OS specific script

Question

I would like to create a package.json build script that executes slightly different set of commands when run from Windows, Linux, Mac.

The problem is that I cannot find a way to put it in package.json file that will run without problems at every system.

Here is an example that I would like to have:

"scripts" : {     "build.windows" : "echo do windows specific stuff",     "build.linux" : "echo do linux specific stuff",     "build.mac" : "echo do mac specific stuff",     "build" : "??????????????" <- what to put here to execute script designed for OS                                   on which npm is running } 

Answer 1

There's an NPM package called run-script-os ( NPM | GitHub ) that doesn't require you to write any additional files, and this can be convenient if what you're trying to do is very simple. For example, in your package.json, you might have something like:

"scripts": {     "test": "run-script-os",     "test:darwin:linux": "export NODE_ENV=test && mocha",     "test:win32": "SET NODE_ENV=test&& mocha" } 

Then you could run npm test on Windows, Mac, or Linux and get similar (or different!) results on each.

Answer 2

You can use scripts with node run-script command. npm run is a shortcut of it.

Package json:

"scripts" : {     "build-windows" : "node build-windows.js",     "build-linux" : "node build-linux.js",     "build-mac" : "node build-mac.js",     "build" : "node build.js" } 

Command line:

npm run build-windows 

If you don't like it, you can use commands inside node.js.

Package json:

"scripts" : {     "build" : "node build.js" } 

Build.js

var sys = require('sys'); var exec = require('child_process').exec; var os = require('os');  function puts(error, stdout, stderr) { sys.puts(stdout) }  // Run command depending on the OS if (os.type() === 'Linux')     exec("node build-linux.js", puts);  else if (os.type() === 'Darwin')     exec("node build-mac.js", puts);  else if (os.type() === 'Windows_NT')     exec("node build-windows.js", puts); else    throw new Error("Unsupported OS found: " + os.type());