npm can run a command that I can not enter manually

Had a headscratcher moment with the below, can anyone explain what the difference is?owner@G700:~/cp/project$ ts-node-dev src/server.ts --respawn ts-node-dev: command not found owner@G700:~/cp/project$ npm run dev > asanaTaskRepeater@1.0.0 dev /home/owner/cp/asanaTaskRepeaterBackend > ts-node-dev src/server.ts --respawn ts-node-dev ver. 1.0.0-pre.62 (using ts-node ver. 8.10.2, typescript ver. 3.9.7)

Submitted September 17, 2020 at 09:05PM by fpuen