Tech notes/yarn run in docker

<p>I wanted to build the assets for a website as part of the startup process of a django container. To speed it up, I wanted to install the dependencies during the image creation in the same way I was already doing it for the Python dependencies. </p> <p>The first think I did was moving the files into the container while building the image:</p> <pre class="codehilite"><code>COPY ./yarn.lock /yarn.lock COPY ./package.json /package.json RUN yarn install </code></pre> <p>And I created a start script that would run:</p> <pre class="codehilite"><code>yarn webpack </code></pre> <p>The problem is that the <strong>node_modules</strong> folder ended up being a folder above where the project's <code>package.json</code> file was (in the <code>/app</code> directory in the container). I couldn't find a way of telling yarn where to look for the modules, so I had to force the proper webpack to run, by updated the start script to:</p> <pre class="codehilite"><code>/node_modules/.bin/webpack --mode=production </code></pre> <p>The full example code is in this <a href="https://github.com/Klimaat-Helpdesk/website/pull/52/files">pull request</a>. </p> <p>Tags: <a href="/tags/docker">#docker</a> <a href="/tags/yarn">#yarn</a> <a href="/tags/building-assets">#building-assets</a> <a href="/tags/build-automation">#build-automation</a></p>