This is for consideration only, not a request yet, as I might be able to get upstream lib to publish multiple npm packages.

There is at least one case, when npm refuses to support a use case that yarn supports. The Install multiple versions of a dependency #5499 was rejected by the NPM team, despite a very vocal demand by the community. Yarn chose to implement it.

This feature allows multiple versions of the same library to be added to a project. My particular use case is supporting multiple versions of Vega library, all of which exist under the same name in NPM repository.

The problem with yarn approach is that it makes package.json incompatible with the npm (npm throws an error on npm: protocol).

Can we introduce some project-level setting, e.g. a key in package.json to specify which package manager to use for the build?