Fails to run on node 14

[tarkhil]

node:/root/pm2-prometheus-exporter@[20:56] # pm2 start exporter.js --name pm2-metrics
[PM2] Starting /root/pm2-prometheus-exporter/exporter.js in fork_mode (1 instance)
(node:41654) Warning: Accessing non-existent property 'cat' of module exports inside circular dependency
(Use `node --trace-warnings ...` to show where the warning was created)
(node:41654) Warning: Accessing non-existent property 'cd' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'chmod' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'cp' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'dirs' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'pushd' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'popd' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'echo' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'tempdir' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'pwd' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'exec' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'ls' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'find' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'grep' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'head' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'ln' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'mkdir' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'rm' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'mv' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'sed' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'set' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'sort' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'tail' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'test' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'to' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'toEnd' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'touch' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'uniq' of module exports inside circular dependency
(node:41654) Warning: Accessing non-existent property 'which' of module exports inside circular dependency
[PM2] Done.

pm2 3.5.1

[bernhardkaindl]

When built by npm install <dir> -g and then installed by pm2 install --tarball ... or pm2 start exporter.js, current HEAD works on:

node -v
v14.19.3
pm2 -V
5.2.0