Poplar

Poplar is a programming language that compiles to Minecraft Java datapacks (1.21.9 and newer).

namespace demo;

var #deaths = 0;

mcfun load() {
    onEvent("deathCount", playerDied);
}

mcfun playerDied() {
    #deaths = #deaths + 1;
    /tellraw @a {{["Deaths: ", text(#deaths)]}};
}

Each mcfun compiles to a normal Minecraft function, so other datapacks can call it with /function. A variable is either a scoreboard score (#deaths) or NBT data ($item). A line that starts with / is a Minecraft command, and the compiler checks it when you build.