Honestly, I'm not sure. My needs were very minimal, one Deno stdlib import, and one third party module import (for ini file parsing). https://deno.land/x/ has their third party module ecosystem, but it's all just JS in the end, so I think think there's anything making it so you couldn't use the NPM ecosystem.
I found this article[1] which seems to indicate if the node packages use ES modules you can use import them as is, or if not it says JSPM can help with that.
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Does the fact that you didn't need Npm mean that Deno has a suffciently large built-in library that a thing like Npm is in most cases not needed?
Honestly, I'm not sure. My needs were very minimal, one Deno stdlib import, and one third party module import (for ini file parsing). https://deno.land/x/ has their third party module ecosystem, but it's all just JS in the end, so I think think there's anything making it so you couldn't use the NPM ecosystem.
I found this article[1] which seems to indicate if the node packages use ES modules you can use import them as is, or if not it says JSPM can help with that.
1: https://medium.com/samsung-internet-dev/using-node-modules-i...