How I can pass opts/flags which I pass to npm install command to postinstall scripts?

Question

I write npm install X --some-param=some-value command. X package has postinstall script: ./scripts/postinstall.js. How I can pass some-param to postinstall script?

I try process.argv but it does not contain anything which I use as npm install params.

score 0 · Answer 1 · answered Jul 07 '17 at 16:55

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I don't think there's a way to do that, since npm install assumes all arguments it doesn't recognize are package names. What works, and is a common solution, is to use environment variables instead. When you do this:

$ SOME_PARAM=some-value npm install

...you can then access the value of SOME_PARAM with process.env.SOME_PARAM in your postinstall.js script.

answered Jul 07 '17 at 16:55

Jordan Running

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Hm. Yes this will work on MacOS or maybe in linux. IT is not as easy in Windows. Any cross-os solution? Thougts? – Sharikov Vladislav Jul 07 '17 at 21:40
See this related question, which has several viable answers: https://stackoverflow.com/questions/9249830/how-can-i-set-node-env-production-in-windows – Jordan Running Jul 07 '17 at 21:42

score 0 · Answer 2 · answered Apr 13 '22 at 09:48

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You can access the args with process.env.npm_config_argv.

Running yarn install --test-arg will give a value of {"remain":[],"cooked":["install"],"original":["install","--test-arg"]}.

answered Apr 13 '22 at 09:48

amcquaid

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How I can pass opts/flags which I pass to npm install command to postinstall scripts?

2 Answers2