updating-1.17-to-1.18

Source: https://gist.github.com/ChampionAsh5357/73c3bb41d3a8de2d020827e0069314a7 
License: Creative Commons Attribution 4.0 International

Minecraft 1.17.x -> 1.18.x Mod Migration Primer

This is a high level, non-exhaustive overview on how to migrate your mod from 1.17.x to 1.18.x using Forge.

This primer is licensed under the Creative Commons Attribution 4.0 International, so feel free to use it as a reference and leave a link so that other readers can consume the primer.

If there's any incorrect or missing information, please leave a comment below. Thanks!

BlockEntity#save -> BlockEntity#saveAdditional
- If you are storing BlockEntities somewhere, don't call save. Call saveWithFullMetadata(), saveWithId() or saveWithoutMetadata(), depending on your needs.
ClientboundBlockEntityDataPacket uses static create method
- Gets CompoundTag from BlockEntity#getUpdateTag unless a function is specified
Constants$BlockFlags was removed and are now obtained from their vanilla location in Block
FMLNetworkConstants -> NetworkConstants
RecipeProvider#buildShapelessRecipes -> RecipeProvider#buildCraftingRecipes
(Forge) ItemModelProvider#generateModels -> ItemModelProvider#registerModels
@CapabilityInject removed in favor of CapabilityManager#get
PlayerEvent$Clone#wasDead field -> PlayerEvent$Clone#isWasDeath method
RenderWorldLastEvent -> RenderLevelLastEvent
Java 16 -> Java 17
ItemOverride -> BakedOverride
ItemProperties#registerGeneric no longer private
PlacedFeatures changed again I think
- Ordering is now in a list instead of nested iirc
Renames and refactors: https://gist.github.com/TheCurle/d00b4201369d6536d5e7fdd8040862b1
Registries and TagKeys from Shrimp: https://gist.github.com/SizableShrimp/ddcbe9a9862cc4a0f526c42ae49b2c1d
- Specify how tags are queried or gotten
- How registry keys should be obtained from values