perf: reduce 3D runtime artifacts (#7)

tests/decoder-staging.test.ts

@@ -1,5 +1,5 @@
 import { createHash } from 'node:crypto';
-import { readFileSync, statSync } from 'node:fs';
+import { existsSync, readFileSync, statSync } from 'node:fs';
 import { dirname, resolve } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { describe, expect, it } from 'vitest';
@@ -11,21 +11,25 @@ function sha256(path: string): string {
 }
 
 describe('decoder staging', () => {
-  it('copies decoder binaries byte-for-byte without executable permission', () => {
-    const threeRoot = resolve(
-      dirname(fileURLToPath(import.meta.resolve('three'))),
-      '..',
-    );
+  it('stages only the single-thread IFC runtime', () => {
+    expect(
+      existsSync(
+        resolve(projectRoot, 'apps/viewer-3d/public/web-ifc/web-ifc-mt.wasm'),
+      ),
+    ).toBe(false);
+  });
+
+  it('does not stage decoder copies already bundled by Three.js', () => {
+    for (const directory of ['draco', 'basis']) {
+      expect(
+        existsSync(resolve(projectRoot, 'apps/viewer-3d/public', directory)),
+      ).toBe(false);
+    }
+  });
+
+  it('copies the IFC binary byte-for-byte without executable permission', () => {
     const ifcRoot = dirname(fileURLToPath(import.meta.resolve('web-ifc')));
     const pairs = [
-      [
-        resolve(threeRoot, 'examples/jsm/libs/draco/gltf/draco_decoder.wasm'),
-        resolve(projectRoot, 'apps/viewer-3d/public/draco/draco_decoder.wasm'),
-      ],
-      [
-        resolve(threeRoot, 'examples/jsm/libs/basis/basis_transcoder.wasm'),
-        resolve(projectRoot, 'apps/viewer-3d/public/basis/basis_transcoder.wasm'),
-      ],
       [
         resolve(ifcRoot, 'web-ifc.wasm'),
         resolve(projectRoot, 'apps/viewer-3d/public/web-ifc/web-ifc.wasm'),

tests/e2e/viewer3d.subpath.spec.ts

@@ -1,6 +1,8 @@
 import { expect, test } from '@playwright/test';
 
-test('viewer3d resolves Draco and IFC decoders under a production subpath', async ({ page }) => {
+test('viewer3d resolves hashed Draco and staged IFC decoders under a production subpath', async ({
+  page,
+}) => {
   const failedRequests: string[] = [];
   const responseUrls: string[] = [];
   page.on('requestfailed', (request) => failedRequests.push(request.url()));
@@ -24,7 +26,11 @@ test('viewer3d resolves Draco and IFC decoders under a production subpath', asyn
     );
   }
 
-  expect(responseUrls.some((url) => url.includes('/viewer-3d/draco/'))).toBe(true);
+  expect(
+    responseUrls.some((url) =>
+      /\/viewer-3d\/assets\/draco_decoder-.+\.wasm$/.test(new URL(url).pathname),
+    ),
+  ).toBe(true);
   expect(responseUrls.some((url) => url.endsWith('/viewer-3d/web-ifc/web-ifc.wasm'))).toBe(true);
   expect(failedRequests).toEqual([]);
 });