Codedeploy packages installed BeforeInstall not available in AfterInstall hook

I'm deploying a node application in aws using aws codepipeline.

appspec.yaml

version: 0.0
os: linux
files:
  - source: /
    destination: /home/ubuntu/my-app
    overwrite: true
hooks:
  BeforeInstall:
    - location: scripts/before_install.sh
      timeout: 300
      runas: ubuntu
  AfterInstall:
    - location: scripts/after_install.sh
      timeout: 300
      runas: ubuntu
  ApplicationStart:
    - location: scripts/application_start.sh
      timeout: 300
      runas: ubuntu

before_install.sh

#!/bin/bash

sudo apt-get update
curl -sL https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.0/install.sh -o install_nvm.sh
bash install_nvm.sh
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
nvm install --lts
npm install --location=global yarn
yarn global add pm2

So node, npm, yarn and pm2 is installed. Since yarn is used to intall pm2 if this runs then yarn should be successfully installed.

after_install.sh

#!/bin/bash

cd /home/ubuntu/my-app
yarn install
yarn run build

After running I get following error

after_install.sh: line 7: yarn: command not found after_install.sh: line 8: yarn: command not found

When look at build error it seems like yarn only not available in after_installation hook.

2022-06-20 18:21:49 [stdout]Installing latest LTS version.
2022-06-20 18:21:49 [stderr]v16.15.1 is already installed.
2022-06-20 18:21:50 [stdout]Now using node v16.15.1 (npm v8.11.0)
2022-06-20 18:21:51 [stdout]
2022-06-20 18:21:51 [stdout]changed 1 package, and audited 2 packages in 489ms
2022-06-20 18:21:51 [stdout]
2022-06-20 18:21:51 [stdout]found 0 vulnerabilities
2022-06-20 18:21:51 [stdout]yarn global v1.22.19
2022-06-20 18:21:51 [stdout][1/4] Resolving packages...
2022-06-20 18:21:51 [stdout][2/4] Fetching packages...
2022-06-20 18:21:51 [stdout][3/4] Linking dependencies...
2022-06-20 18:21:52 [stdout][4/4] Building fresh packages...
2022-06-20 18:21:52 [stdout]success Installed "pm2@5.2.0" with binaries:
2022-06-20 18:21:52 [stdout]      - pm2
2022-06-20 18:21:52 [stdout]      - pm2-dev
2022-06-20 18:21:52 [stdout]      - pm2-docker
2022-06-20 18:21:52 [stdout]      - pm2-runtime
2022-06-20 18:21:52 [stdout]Done in 1.27s.
2022-06-20 18:21:54 LifecycleEvent - AfterInstall
2022-06-20 18:21:54 Script - scripts/after_install.sh
2022-06-20 18:21:54 [stderr]/opt/codedeploy-agent/deployment-root/faee375f-f793-4b89-b57e-78c445c6c02b/d-WCHP7OWQH/deployment-archive/scripts/after_install.sh: line 7: yarn: command not found
2022-06-20 18:21:54 [stderr]/opt/codedeploy-agent/deployment-root/faee375f-f793-4b89-b57e-78c445c6c02b/d-WCHP7OWQH/deployment-archive/scripts/after_install.sh: line 8: yarn: command not found