Write your datapack in TypeScript and let the compiler generate the .mcfunction and JSON files for you.
Here's a small function that greets every player and hands them some diamonds. The tabs below are the actual files the compiler produced from it:
import { Datapack, v26_2, Selector, Item } from "helix";
const dp = new Datapack("welcome", v26_2);
dp.createFunction("greet").build((ctx) => {
const players = Selector.allPlayers();
ctx.tellraw(players, "Welcome to the server!");
ctx.playerGive(players, Item.DIAMOND, 3);
});Compiled output - the real files helix emits for the code above:
tellraw @a {"text":"Welcome to the server!"}
give @a minecraft:diamond 3