--save-dev

[ScottFreeCode]

Is there a way to have a badge's install line include --save-dev for tools that are primarily meant to be used as dev dependencies (e.g. continuous-integration and testing frameworks, transpilers/bundlers that a project would depend on a specific version rather than the developer having a global install, etc.)?

(I have a vague recollection that if you npm init a project that already has locally installed dependencies, npm will somehow figure out which ones to put in package.json as regular dependencies and which to put in it as dev dependencies, but I never found out how they control which are which.)