$ npm i @koa/router

added 9 packages in 429ms

$ npm audit
# npm audit report

path-to-regexp  0.2.0 - 7.2.0
Severity: high
path-to-regexp outputs backtracking regular expressions - https://github.com/advisories/GHSA-9wv6-86v2-598j
No fix available
node_modules/path-to-regexp
  @koa/router  *
  Depends on vulnerable versions of path-to-regexp
  node_modules/@koa/router

2 high severity vulnerabilities

Some issues need review, and may require choosing
a different dependency.