How to fix npm ERR! code EROFS npm ERR! EROFS: read-only file system in npm

# Check if the npm cache directory is writable
touch ~/.npm/test-write.tmp && rm ~/.npm/test-write.tmp && echo 'Writable' || echo 'Read-only'

# Check npm root and cache configuration
npm root -g
npm config list --json | grep -E '(prefix|cache)'

# Set npm cache to /tmp (or another writable location)
npm config set cache '/tmp/npm-cache'

# Set npm prefix to a user-writable directory
npm config set prefix ~/.local

# Verify the changes
npm config list --json

# Clear npm cache and try install again
npm cache clean --force
npm install

# Backup and view your current .npmrc
cp ~/.npmrc ~/.npmrc.backup
cat ~/.npmrc

# For a fresh start, move your old config
mv ~/.npmrc ~/.npmrc.old
npm config list --json

# Reconfigure as needed
npm config set prefix ~/.local

# Create writable directories in the container
RUN mkdir -p /tmp/npm-cache && chmod 777 /tmp/npm-cache

# Configure npm to use the writable cache
RUN npm config set cache '/tmp/npm-cache'

# Install dependencies
RUN npm install

docker build --mount=type=cache,target=/root/.npm .

# In your build process or Lambda handler setup
export HOME=/tmp
npm config set cache '/tmp/npm-cache'

// In application code, write temporary files to /tmp only
const fs = require('fs');
// Correct: uses /tmp for temporary storage
fs.writeFileSync('/tmp/output.txt', data);
// NOT: /var/task is read-only

# VirtualBox: enable symlinks on the host
VBoxManage setextradata VM_NAME VBoxInternal2/SharedFoldersEnableSymlinksCreate/share 1

# Then remount the shared folder
mount -t vboxsf -o remount,exec share /mnt/share

# In PowerShell as Admin
powercfg /h off