Nuevo e ingenuo para reaccionar. Estaba tratando de ejecutar el comando "npm I react-router-dom", pero cuando lo hice canceló la descarga y me dio estos errores. Encontré este enlace a algún tipo de "solución": https://nvd.nist.gov/vuln/detail/CVE-2021-3803

 # npm audit report nth-check <2.0.1 Severity: high Inefficient Regular Expression Complexity in nth-check - https://github.com/advisories/GHSA-rp65-9cf3-cjxr fix available via `npm audit fix --force` Will install react-scripts@2.1.3, which is a breaking change node_modules/svgo/node_modules/nth-check css-select <=3.1.0 Depends on vulnerable versions of nth-check node_modules/svgo/node_modules/css-select svgo 1.0.0 - 1.3.2 Depends on vulnerable versions of css-select node_modules/svgo @svgr/plugin-svgo <=5.5.0 Depends on vulnerable versions of svgo node_modules/@svgr/plugin-svgo @svgr/webpack 4.0.0 - 5.5.0 Depends on vulnerable versions of @svgr/plugin-svgo node_modules/@svgr/webpack react-scripts >=2.1.4 Depends on vulnerable versions of @svgr/webpack node_modules/react-scripts 6 high severity vulnerabilities To address all issues (including breaking changes), run: npm audit fix --force