--legacy-peer-deps: ignore all peerDependencies when installing, in the style of npm version 4 through version 6.

--strict-peer-deps: fail and abort the install process for any conflicting peerDependencies when encountered. By default, npm will only crash for peerDependencies conflicts caused by the direct dependencies of the root project.

--force: will force npm to fetch remote resources even if a local copy exists on disk.