yarn add <package-name> should not run the prepublish hook

[kristenmills]

Do you want to request a feature or report a bug?
Report a bug.

What is the current behavior?
Currently when you run yarn add <package-name> the prepublish hook is also run. This is not expected behavior as npm install <package-name> does not run the prepublish hook.

If the current behavior is a bug, please provide the steps to reproduce.
yarn add <any package>

What is the expected behavior?
yarn add <package-name> should not run prepublish. (yarn install should continue to run prepublish)

Please mention your node.js, yarn and operating system version.
Node 7.5
Yarn 0.23.2
Mac OSX 10.12.2

[juanca]

npm install does run the publish hook. This is why there is prepublishOnly hook.

IMPORTANT: As of npm@5, prepublish will only be run for npm publish. This will make its behavior identical to prepublishOnly, so npm@6 or later may drop support for the use of prepublishOnly, and then maybe we can all forget this embarrassing thing ever happened.

[kristenmills]

npm install with no args does. npm install <a package> does not.

[bestander]

Should be implemented via yarnpkg/rfcs#70