Minecraft:Java Edition 19w38a

19w38a is the fifth Minecraft:snapshot for Minecraft:Java Edition 1.15, released on September 18, 2019, which makes some technical changes such as adding new parameters to existing Minecraft:commands and makes changes to the rendering system.<ref name="19w38a">Template:Snap</ref> However, due to a game crashing bug caused by breaking Minecraft:blocks, it was replaced by Minecraft:19w38b later that day.

Additions

Command format

Template:Cmd

• Can now use storage as a source or target, which is general purpose, key/value storage.
  • Each storage is identified by a distinct Minecraft:resource location.
  • Storage is shared between all Minecraft:dimensions in a world.
  • Data in storage persists between on world close.

Template:Cmd

• Added subcommand Template:Cmd
  • Evaluates custom predicates, defined in the predicates directory of a Minecraft:data pack.
• Added subcommand Template:Cmd
  • Stores the command result to the storage target for the Template:Cmd command.

Template:Cmd

• Added new optional syntax Template:Cmd.
  • Defaults to replace.
• Added new syntax Template:Cmd to remove existing schedules.
  • Returns the number of removed schedules.
• Extended Template:Cmd to allow scheduling the same function multiple times.

Minecraft:Target selectors

• New selector parameter predicate allows applying custom predicates, defined in the predicates directory of a Minecraft:data pack.

Minecraft:Loot tables

• Loot table predicates can now be defined in separate files and used for entity selectors and in execute if command.
• Added new parameters to the location_check condition.
  • Template:Nbt, Template:Nbt, Template:Nbt – optional offsets to location.
• Added reference.
  • Includes condition defined in predicates directory of data pack, selected with name parameter.
• Added time_check condition.
  • Checks Minecraft:time of day.
    • Template:Nbt – range of accepted values.
    • Template:Nbt – if present, time is modulo-divided by this value (for example, if set to 24000, value operates on a time period of days).

General

Minecraft:Predicates

• Added custom predicates.
  • The condition part of Minecraft:loot tables can now be defined as separate data pack resource in predicates directory.

Entity predicate

• Now accepts player field, which checks player properties.
  • Fails when entity is not Minecraft:player.
  • Fields:
    • level – range of allowed player levels.
    • gamemode – same values as Template:Cmd command.
    • stats – list of statistics to match. Entry fields: Template:Nbt (like minecraft:custom), Template:Nbt (like minecraft:sneak_time) and Template:Nbt (an integer range).
      • For example, {"stats":[{"type":"minecraft:used","stat":"minecraft:fishing_rod","value":{"min":2,"max":10}}]} succeeds if the player has used fishing rods a total of 2 through 10 times; more or less fails.
    • recipes – map of recipe IDs. Boolean value tells if it should or should not be known to player.
    • advancements – map of advancement IDs. If value is a boolean, checks if advancement is done. If value is an object, checks completion of criterions.
• Entity predicate now accepts team field, which matches team name.

Location predicate

• Predicate now accepts block and fluid sub-predicate.
  • Fields:
    • block – exact Minecraft:block ID to match.
    • fluid – exact Minecraft:fluid ID to match.
    • tag – block/fluid ID to match.
    • nbt – matcher for block entity NBT (only for blocks).
    • state – map of name/value properties. Value can be integer, boolean or string or object with optional min and max properties.
• Predicate now accepts the light sub-predicate.
  • Object has one integer range – light – that matches visible light (maximum value of sky-darkening and block light).

Changes

Blocks

General

• The outline around Minecraft:blocks (which appears when a block is looked at) is now thicker.

Command format

Template:Cmd

• Setting game rule fireDamage to false now prevents damage from Minecraft:magma blocks.

Template:Cmd

• The first parameter now defaults to @s if no target argument is given.

General

Minecraft:Debug screen

• The "chunk updates" counter on the second line no longer appears.