Isle-Slingers/js/levels/index.js

/* ISLE SLINGERS -- levels/index.js (module: levels -- aggregator / public API)
 * RC-375D84 S-2 modularization. The original js/levels.js monolith is now:
 *   levels/helpers/  - block/enemy constructors + SLING anchor (shared scope L)
 *   levels/data/level-N.js - one level definition each (uses the shared scope)
 * This aggregator loads the parts in order, builds the LEVELS array, and
 * exposes the byte-identical public API: { LEVELS, SLING }.
 *
 * Load contract:
 *   browser - levels/helpers/index.js first, then data/level-1..5.js, then this file
 *             (parts arrive on globalThis.ISLE_LEVEL_PARTS in <script> order);
 *   node    - this file requires the parts itself, in the same order.
 */
(function (root, factory) {
  var api = factory();
  if (typeof module !== 'undefined' && module.exports) module.exports = api;
  else root.ISLE_LEVELS = api;
})(typeof globalThis !== 'undefined' ? globalThis : this, function () {
  'use strict';

  var L = {}; // the single shared levels scope

  var parts;
  if (typeof module !== 'undefined' && module.exports) {
    parts = [
      require('./helpers/index.js'),
      require('./data/level-1.js'),
      require('./data/level-2.js'),
      require('./data/level-3.js'),
      require('./data/level-4.js'),
      require('./data/level-5.js')
    ];
  } else {
    parts = (typeof globalThis !== 'undefined' && globalThis.ISLE_LEVEL_PARTS) || [];
  }

  var LEVELS = [];
  for (var i = 0; i < parts.length; i++) {
    var part = parts[i](L);
    if (part && part.id) LEVELS.push(part); // level data parts carry an `id`
  }
  if (!LEVELS.length) throw new Error('ISLE_LEVELS: no level parts loaded before the aggregator');

  return { LEVELS: LEVELS, SLING: L.SLING };
});