https://bumpmesh.com/js/threeCompat.js

1/*
2 * Copyright (c) 2026 CNCKitchen (Stefan Hermann) and contributors
3 * SPDX-License-Identifier: AGPL-3.0-only
4 */
5
6/**
7 * threeCompat.js — single resolution point for the three.js dependency of the
8 * mesh-processing pipeline modules (subdivision, regularize, displacement,
9 * decimation, meshRepair, exportPipeline).
10 *
11 * Why this exists: those modules must run in THREE contexts —
12 *   1. the page (resolves bare 'three' via the import map in index.html),
13 *   2. Node test/bench scripts (resolves 'three' from node_modules),
14 *   3. the export Web Worker (workers IGNORE the page's import map per the
15 *      HTML spec, so a bare 'three' import throws there).
16 * The try/catch below uses the bare specifier wherever it resolves (page,
17 * Node — same module instance as the rest of the app, so instanceof checks
18 * hold) and falls back to the CDN URL only inside workers.
19 *
20 * KEEP THE URL IN SYNC with the import map in index.html. The page will
21 * usually have the file in HTTP cache already, so the worker fetch is cheap.
22 */
23const CDN_THREE = 'https://cdn.jsdelivr.net/npm/[email protected]/build/three.module.js';
24
25let THREE;
26try {
27  THREE = await import('three');
28} catch {
29  THREE = await import(CDN_THREE);
30}
31
32export { THREE };