@trailstash/ultra/build-emoji-sprites.js

A web based tool for making MapLibre GL maps with data from sources such as Overpass, GeoJSON, GPX, KML, TCX, etc

import fs from "fs";
import emoji from "emoji-datasource-google/emoji.json" with { type: "json" };

for (const [size, name] of [
  [32, "emoji"],
  [64, "emoji@2x"],
]) {
  const spriteJSON = {};

  for (const { sheet_x, sheet_y, short_names, image } of emoji) {
    const x = sheet_x * (size + 2) + 1;
    const y = sheet_y * (size + 2) + 1;
    for (const shortName of short_names) {
      spriteJSON[shortName] = {
        height: size,
        pixelRatio: size / 32,
        width: size,
        x,
        y,
      };
    }
  }

  fs.writeFileSync(
    `static/sprites/${name}.json`,
    JSON.stringify(spriteJSON, null, 2),
  );
  fs.copyFileSync(
    `node_modules/emoji-datasource-google/img/google/sheets-256/${size}.png`,
    `static/sprites/${name}.png`,
  );
}