nixpkgs/nixos/modules/programs/npm.nix

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{ config, lib, pkgs, ... }:
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with lib;
let
cfg = config.programs.npm;
in
{
###### interface
options = {
programs.npm = {
enable = mkEnableOption "<command>npm</command> global config";
npmrc = lib.mkOption {
type = lib.types.lines;
description = ''
The system-wide npm configuration.
See <link xlink:href="https://docs.npmjs.com/misc/config"/>.
'';
default = ''
prefix = ''${HOME}/.npm
'';
example = ''
prefix = ''${HOME}/.npm
https-proxy=proxy.example.com
init-license=MIT
init-author-url=http://npmjs.org
color=true
'';
};
};
};
###### implementation
config = lib.mkIf cfg.enable {
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environment.etc.npmrc.text = cfg.npmrc;
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environment.variables.NPM_CONFIG_GLOBALCONFIG = "/etc/npmrc";
environment.systemPackages = [ pkgs.nodePackages.npm ];
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};
}