* - string 'modules' Pipe-separated list of module names
* - string|null 'only' "scripts" (unwrapped script), "styles" (stylesheet), or null
* (mw.loader.implement).
* - string 'modules' Pipe-separated list of module names
* - string|null 'only' "scripts" (unwrapped script), "styles" (stylesheet), or null
* (mw.loader.implement).