How it works

Only items that the player has held appear in the index.
The craftable/recipe view only shows recipes that can be made entirely from known items.
Craftable recipes show their output item, but you can't do use or recipe lookups on them until they've been crafted.
Tag and list ingredients are filtered to hide unknown items in the set.
Known items can be prepopulated from a JSON file.
Known items are stored client side, separately for each player and world.
Works with EMI++ Backport item groups.

Configuration

Currently the only configuration is the prepopulated items file, config/emi_discovery_pre_discovered.json. The format is a JSON array of strings specifying items by registry ID. Example:

[
    "minecraft:stone",
    "minecraft:iron_ingot"
]

The contents are copied to the the known items list of any player who doesn't already have one at login.

Acknowledgements

Inspired by, based on, and reuses code from Discovered Enough Items
Icon uses Archaeologist by Jevgenijs Kudinovs from The Noun Project

EMIDiscovery