Why did npm disappear on Debian9?

Question

linux

Debian 9
| There was a node and npm everything worked fine
after a while, it didn’t work, but the system was updated
, an error appeared that it could not find the npm command, I
checked the node in place
nodejs -v
v8.11.3
npm -v
bash: npm: command not found
at trying to manually install npm produces this
apt-get install npm ..........
Note that instead of "npm" it selects "nodejs"
The nodejs package of the newest version (8.11.3-1nodesource1) is already installed.
what kind of joke is this and how to defeat it, can you tell me?