AWS Elastic Beanstalk - Replace npm with yarn

01_install_yarn.config

# .ebextensions/01_install_yarn.config

files:
  '/opt/elasticbeanstalk/hooks/appdeploy/pre/49install_yarn.sh' :
    mode: '000755'
    owner: root
    group: root
    content: |
      #!/usr/bin/env bash
      set -euxo pipefail

      EB_APP_STAGING_DIR=$(/opt/elasticbeanstalk/bin/get-config container -k app_staging_dir)

      if node -v; then
        echo 'Node already installed.'
      else
        echo 'Installing node...'
        curl --silent --location https://rpm.nodesource.com/setup_8.x | sudo bash -
        yum -y install nodejs
      fi

      if yarn -v; then
        echo 'Yarn already installed.'
      else
        echo 'Installing yarn...'
        wget https://dl.yarnpkg.com/rpm/yarn.repo -O /etc/yum.repos.d/yarn.repo
        yum -y install yarn
      fi

  '/opt/elasticbeanstalk/hooks/appdeploy/pre/50npm.sh' :
    mode: '000755'
    owner: root
    group: root
    content: |
      #!/usr/bin/env bash
      set -euxo pipefail

      yarn install

This looks to be a newer solution:
https://stackoverflow.com/a/56776872/1217760

I was successfully able to use the approach described here. TL;DR:

1. Create a .platform/hooks/prebuild/yarn.sh file with the following content:

   #!/bin/bash
   
   # need to install node first to be able to install yarn (as at prebuild no node is present yet)
   sudo curl --silent --location https://rpm.nodesource.com/setup_12.x | sudo bash -
   sudo yum -y install nodejs
   
   # install yarn
   sudo wget https://dl.yarnpkg.com/rpm/yarn.repo -O /etc/yum.repos.d/yarn.repo
   sudo yum -y install yarn
   
   # install
   cd /var/app/staging/
   
   # debugging..
   ls -lah
   
   yarn install --prod
   
   chown -R webapp:webapp node_modules/ || true # allow to fail

2. Be sure to chmod +x this file (it needs to be executable)

Hi @nikaspran, I follow this article but got permission error for this file .platform/hooks/prebuild/yarn.sh. How and where I should do chmod +x to this file?

https://stackoverflow.com/questions/40978921/how-to-add-chmod-permissions-to-file-in-git

make sure you add the correct version:

sudo curl --silent --location https://rpm.nodesource.com/setup_{version_number}.x | sudo bash -

@hmtri1011

for permission, git update-index --chmod=+x path/to/file

2 things I would like to add:

1. after git update-index command, you only have to git commit
2. touching /path/to/file is always resetting the permission for me from 100755 => 100644. So I have to make sure I run update-index command again