npm: When to use `–force` and `–legacy-peer-deps`

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In the new version of npm (v7), by default, npm install will fail when it encounters conflicting peerDependencies. It was not like that before.

Take a look here for more info about peer dependencies in npm v7.

The differences between the two are below –

  • --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.

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