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dwg-dxf-viewer-sample/apps/viewer-3d/tools/copy-decoders.mjs
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JavaScript

// Copies Draco + KTX2/Basis decoder WASM from three.js into public/ so the
// runtime paths /draco/ and /basis/ resolve (version-matched to installed three).
// Also copies the web-ifc single-thread WASM to public/web-ifc/ for the IFC path.
// Runs automatically via `npm install` (postinstall). Safe to re-run.
import { cpSync, copyFileSync, existsSync, mkdirSync, rmSync } from 'node:fs';
import { dirname, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';
const __dirname = dirname(fileURLToPath(import.meta.url));
const root = resolve(__dirname, '..');
const threeEntry = fileURLToPath(import.meta.resolve('three'));
const threeRoot = resolve(dirname(threeEntry), '..');
const libs = resolve(threeRoot, 'examples/jsm/libs');
const targets = [
[resolve(libs, 'draco/gltf'), resolve(root, 'public/draco')],
[resolve(libs, 'basis'), resolve(root, 'public/basis')],
];
if (!existsSync(libs)) {
console.warn('[copy-decoders] three not installed yet — skipping (will run on next install).');
process.exit(0);
}
for (const [src, dest] of targets) {
if (!existsSync(src)) {
console.warn(`[copy-decoders] source missing: ${src}`);
continue;
}
rmSync(dest, { force: true, recursive: true });
mkdirSync(dest, { recursive: true });
cpSync(src, dest, { recursive: true });
console.log(`[copy-decoders] ${src} -> ${dest}`);
}
// web-ifc single-thread WASM (+ MT build if present) for the IFC load path.
const ifcEntry = fileURLToPath(import.meta.resolve('web-ifc'));
const ifcSrcDir = dirname(ifcEntry);
const ifcDest = resolve(root, 'public/web-ifc');
if (existsSync(ifcSrcDir)) {
mkdirSync(ifcDest, { recursive: true });
for (const wasm of ['web-ifc.wasm', 'web-ifc-mt.wasm']) {
const src = resolve(ifcSrcDir, wasm);
if (!existsSync(src)) continue;
copyFileSync(src, resolve(ifcDest, wasm));
console.log(`[copy-decoders] ${src} -> ${resolve(ifcDest, wasm)}`);
}
} else {
console.warn('[copy-decoders] web-ifc not installed yet — skipping IFC wasm.');
}