 even if they
are booleans (the config parser doesn&#39;t know what the options are at
the time of parsing.)  If no value is provided, then the option is set
to boolean <code>true</code>.</li>
<li>Environment Variables:<br>Set any config by prefixing the name in an environment variable with
<code>npm_config_</code>.  For example, <code>export npm_config_key=val</code>.</li>
<li>User Configs:<br>The file at $HOME/.npmrc is an ini-formatted list of configs.  If
present, it is parsed.  If the <code>userconfig<