Webpack build process failing with no error

Feedback & Bug Reports
1

I have the following circle file…

machine:
  post:
    # GCloud setup
    - sudo /opt/google-cloud-sdk/bin/gcloud --quiet components update --version 157.0.0
    - sudo /opt/google-cloud-sdk/bin/gcloud --quiet components update --version 157.0.0 kubectl
    - echo $GCLOUD_SERVICE_KEY
    - echo $GCLOUD_SERVICE_KEY | base64 --decode -i > ${HOME}/gcloud-service-key.json
    - cat ${HOME}/gcloud-service-key.json
    - sudo /opt/google-cloud-sdk/bin/gcloud auth activate-service-account --key-file ${HOME}/gcloud-service-key.json
    - sudo /opt/google-cloud-sdk/bin/gcloud config set project $GCLOUD_PROJECT_NAME
    - sudo /opt/google-cloud-sdk/bin/gcloud --quiet config set container/cluster $GCLOUD_CLUSTER_NAME
    - sudo /opt/google-cloud-sdk/bin/gcloud config set compute/zone ${CLOUDSDK_COMPUTE_ZONE}
    - sudo /opt/google-cloud-sdk/bin/gcloud --quiet container clusters get-credentials $GCLOUD_CLUSTER_NAME
    # Permissions fix for kubectl - https://circleci.com/docs/continuous-deployment-with-google-container-engine/
    - sudo chown -R ubuntu:ubuntu /home/ubuntu/.kube
  services:
    - docker
  environment:
    GCLOUD_PROJECT_NAME: tabb-168314
    GCLOUD_CLUSTER_NAME: dev
    CLOUDSDK_COMPUTE_ZONE: europe-west1-b
    DOCKER_TAG_PREFIX: "eu.gcr.io/$GCLOUD_PROJECT_NAME/ui"
    DOCKER_TAG: "$DOCKER_TAG_PREFIX:$CIRCLE_SHA1"
    NODE_ENV: production
dependencies:
  cache_directories:
    - "node_modules"
compile:
  override:
    - echo $DOCKER_TAG
    - if [ $CIRCLE_BRANCH = 'master' ]; then cp ./src/env.production ./src/env.js; fi
    - if [ $CIRLCE_BRANCH = 'develop' ]; then cp ./src/env.staging ./src/env.js; fi
    - if [ $CIRLCE_BRANCH = 'story/72-dockerise-and-setup-circleci' ]; then cp ./src/env.staging ./src/env.js; fi
    - free -m
    - npm run deploy:prod:
        timeout: 9000
    - docker build -t $DOCKER_TAG .
test:
  override:
    - npm test
deployment:
  production:
    branch: ['master']
    commands:
      - docker tag "$DOCKER_TAG" "$DOCKER_TAG_PREFIX:latest"
      - sudo /opt/google-cloud-sdk/bin/gcloud docker -- push $DOCKER_TAG
      - sudo /opt/google-cloud-sdk/bin/gcloud docker -- push "$DOCKER_TAG_PREFIX:latest"
      - kubectl --namespace=production patch deployment ui -p '{"spec":{"template":{"spec":{"containers":[{"name":"ui","image":"'"$DOCKER_TAG"'"}]}}}}'
  staging:
    branch: ['develop', 'development', 'story/72-dockerise-and-setup-circleci']
    commands:
      - docker tag "$DOCKER_TAG" "$DOCKER_TAG_PREFIX:develop"
      - sudo /opt/google-cloud-sdk/bin/gcloud docker -- push $DOCKER_TAG
      - sudo /opt/google-cloud-sdk/bin/gcloud docker -- push "$DOCKER_TAG_PREFIX:develop"
      - kubectl --namespace=staging patch deployment ui -p '{"spec":{"template":{"spec":{"containers":[{"name":"ui","image":"'"$DOCKER_TAG"'"}]}}}}'

When the build hits the compile stage, more specifically the $ npm run deploy:prod command, it basically throws and exit code 1 without any errors? Am I hitting some kind of memory limit? The command basically runs a webpack bundle/build command.

Cheers,

Ewan