buildspec.yml

# Documentation https://docs.aws.amazon.com/codebuild/latest/userguide/build-spec-ref.html
# Adapted from https://github.com/backspace-academy/aws-nodejs-sample-codebuild/blob/master/buildspec.yml
version: 0.2

env:
  variables: 
    NODE_ENV: "production"

# Basically runs the commands from top to bottom during CodeBuild
phases:
  install:
    runtime-versions:
      nodejs: 10
    commands:
      - echo Installing yarn...
      - npm install -g yarn
  pre_build:
    commands:
      - echo Installing npm dependencies
      - npm install
  build:
    commands:
      - echo Building the web app, started on `date`
      - yarn build
  post_build:
    commands:
      - echo Build completed on `date`

# Here I specify what the CodeBuild output artifact should contain.
# Artifacts should only contain the files needed for the app to run. In this case, these files are 
#   simply everything produced by the 'yarn build' command, i.e. everything under the 'build' directory.
# Do not replace with 
#     files: - 'build/**/*' 
#   as this will include the build folder as well when deploying to S3, which won't work because index.html
#   won't be at the root of the bucket.
artifacts:
  files:
    - '**/*'
  base-directory: build