I've been messing around with kubernetes and I'm trying to setup a development environment with minikube, node and nodemon. My image works fine if I run it in a standalone container, however it crashes with the following error if I put it in my deployment.

yarn run v1.3.2
$ nodemon --legacy-watch --exec babel-node src/index.js
/app/node_modules/.bin/nodemon:2
'use 
^^^^^
 SyntaxError: Invalid or unexpected token
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:599:28)
    at Object.Module._extensions..js (module.js:646:10)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Function.Module.runMain (module.js:676:10)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

I have a dev command in my package.json as so

"dev": "nodemon --legacy-watch --exec babel-node src/index.js",

My image is being built with the following docker file

FROM node:8.9.1-alpine

WORKDIR /app

COPY . /app/

RUN cd /app && yarn install

and my deployment is set up with this

---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  labels:
    app: nodeapp
  name: nodeapp
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nodeapp
  template:
    metadata:
      labels:
        app: nodeapp
    spec:
      containers:
      - name: nodeapp
        imagePullPolicy: Never
        image: app:latest
        command:
        - yarn
        args:
        - run
        - dev
        ports:
          - containerPort: 8080
        volumeMounts:
        - name: code
          mountPath: /app
      volumes:
      - name: code
        hostPath:
          path: /Users/adam/Workspaces/scratch/expresssite
---
apiVersion: v1
kind: Service
metadata:
  name: nodeapp
  labels:
    app: nodeapp
spec:
  selector:
    app: nodeapp
  ports:
  - name: nodeapp
    port: 8080
    nodePort: 30005
  type: NodePort
---

It's obviously crashing on the 'use strict' in the nodemon binstub, but I have no idea why. It works just fine as a standalone docker container. The goal is to have nodemon restart the node process in each pod when I save changes for development, but I'm really not sure where my mistake is.

EDIT:

I have narrowed it down slightly. It is mounting the node_modules from the file host and this is what is causing it to crash. I do have a .dockerignore file setup. Is there a way to either get it to work like this (so if I run npm install it will pickup the changes) or is there a way to get it to use the node_modules that were installed with the image?