How to set env var for .npmrc use

node.js npm package.json npm-scripts
skwny picture skwny · Feb 11, 2018 · Viewed 13.1k times · Source

I need a module in my project to download a private npm package. To accomplish this, I am using a .npmrc file to supply a read-only token needed to download the package. To keep the token supplied by npm out of the file, I wish to add it as an environment variable and let it expand in the file. E.g:

# .npmrc
//registry.npmjs.org/:_authToken=${NPM_TOKEN}

I can't figure out how to get that NPM_TOKEN added to the env before it is referenced for the install. I tried using an npm preinstall script:

"preinstall": "NPM_READ_ONLY_TOKEN=my_token_goes_here_foo_bar"**

But I still get the same error: 

Error: Failed to replace env in config: ${NPM_READ_ONLY_TOKEN}

I tried testing with an echo command to see if preinstall runs before the .npmrc variable expansion, but it apparently does not. I would get the error and not see my echo log. I seem to be missing something here.

I'm aware that putting my token in package.json defeats the purpose of pulling the token out of the .npmrc file. I'm actually using a service that provides env config services that I would use to run a command and get the needed token. E.g. TOKEN=config_service_value.

Answer

jonathanhculver picture jonathanhculver · Dec 14, 2018

You can add the environment variable to your .bashrc or other startup shell file.

export NPM_TOKEN=my_token_goes_here_foo_bar

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