i am trying to use the package "useragent" on a Cloudflare worker i am building, but I get this erro

i am trying to use the package "useragent" on a Cloudflare worker i am building, but I get this error when trying to run it:

node_modules/useragent/lib/update.js:15:19:
15 , yaml = require('yamlparser');

Did I do something wrong (like wrong nodejs version?) or are there just some packages that cannot be used / included in the Cloudflare env ?
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