npm package.json OS specific script

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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.

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