User:JJPMaster/OneClickWelcomer.js

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This script seems to have a documentation page at User:JJPMaster/OneClickWelcomer.

/* This imports the stable gadget version of OneClickWelcomer. If you want to use the latest, unstable version, add the following line to your common.js:

importScript("User:JJPMaster/OneClickWelcomer/unstable.js");

Note that this is not recommended unless you are involved in the development of OneClickWelcomer. For everyday use, it is advised that you use the gadget instead.
*/
mw.loader.load("/w/load.php?modules=ext.gadget.OneClickWelcomer");