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test/setup.mjs

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+// Production calls glMatrix.setMatrixArrayType(Array) before anything else
+// (backend/src/main.ts, frontend/src/index.ts), which makes every vector an f64
+// Array instead of the default Float32Array. Without the same call here the
+// suite pins the numerics of a build nobody ships — including module-level
+// scratch vectors, which are allocated the moment a module is imported.
+//
+// One call per installed gl-matrix: the prebuilt shared bundle keeps gl-matrix
+// external and resolves shared/node_modules, while the backend and frontend
+// sources the tests import directly resolve their own copies.
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
+
+for (const path of [
+  '../shared/node_modules/gl-matrix',
+  '../backend/node_modules/gl-matrix',
+  '../frontend/node_modules/gl-matrix',
+]) {
+  require(path).glMatrix.setMatrixArrayType(Array);
+}