Here are the examples (only 1.12.2) in wiki, link.

 Import Mods.zensumoning.SummoningDirector;

Import Mods.zensumMoning.SummoningatTempt;
Import Mods.zensumMoning.Summoninginfo;
Import Mods.zensumMoning.mobinfo;
SummoningDirector.addsummoninfo (// fixed format.
SummoningInfo.create () // Fixed format.
.Setcatalyst () // The catalyst for summoning is not filled.
.SetReagents ([, *12]) // The items used.
.Addmob (mobinfo.create () // fixed format.
.Setmob ("Minecraft: COW") // Calling creatures.
.Setcount (4) // The number of summoned.
.Setoffset (0,4,0) // The offset of the position after summoning.
.SetSpream (3,3,3) // The randomness after summoning.
.Setdata ({"health": 200, "Attributes": [{"name": "GENERIC.MAXHEALTH", "Base": 200}) // The data of summoning creatures (NBT), in the form of the original version.
Cure
.SetMutator (Function (Attempt as Summoningattempt) {// Try to summon events.
If (attempt.World.raining) {// Deciding whether the summoner's world is raining.
Attempt.success = false; // Prevent the summoning event.
Attempt.message = "Can't summon this in the rain!"; // Output the string for the attemptors.} Else {
Attempt.message = "Woohoo!"; // The judgment is the output of the string.
}
})
);