postcss-cli: using locally vs globally installed postcss modules
<p>How can I install <code>postcss</code> modules locally, and use them through <code>postcss-cli</code> installed globally?</p>

<p>For example:</p>

<pre><code>postcss -u autoprefixer -o style.css index.css
</code></pre>

<p>This command works, if I have <code>postcss-cli</code> and <code>autoprefixer</code> installed globally, or if both are installed locally. But it does not work, if I have <code>postcss-cli</code> installed globally, and <code>autoprefixer</code> locally.</p>

<p>The question is not specific to autoprefixer, since autoprefixer would be a module, that I would what to have installed globally anyways. Any advice would be helpful.</p>

<p>This is the error I get, if <code>postcss-cli</code> is installed globally, and <code>autoprefixer</code> locally:</p>

<pre><code>&gt; postcss -u autoprefixer -o style.css index.css -w

module.js:327
    throw err;
    ^

Error: Cannot find module 'autoprefixer'
    at Function.Module._resolveFilename (module.js:325:15)
    at Function.Module._load (module.js:276:25)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at /home/user/.nvm/versions/node/v4.4.2/lib/node_modules/postcss-cli/index.js:104:14
    at Array.map (native)
    at Object.&lt;anonymous&gt; (/home/user/.nvm/versions/node/v4.4.2/lib/node_modules/postcss-cli/index.js:97:24)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)

npm ERR! Linux 3.19.0-58-generic
npm ERR! argv "/home/user/.nvm/versions/node/v4.4.2/bin/node" "/home/user/.nvm/versions/node/v4.4.2/bin/npm" "run" "css"
npm ERR! node v4.4.2
npm ERR! npm  v2.15.0
npm ERR! code ELIFECYCLE
npm ERR! Node.js@1.0.0 css: `postcss -u autoprefixer -o style.css index.css -w`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the Node.js@1.0.0 css script 'postcss -u autoprefixer -o style.css index.css -w'.
npm ERR! This is most likely a problem with the Node.js package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     postcss -u autoprefixer -o style.css index.css -w
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs Node.js
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! 
npm ERR!     npm owner ls Node.js
npm ERR! There is likely additional logging output above.
</code></pre>