SyntaxError: Cannot use import statement outside a module ❯ ../spatial/src/physics/types/PhysicsTypes.ts:1:1 ❯ ../engine/src/gltf/GLTFComponent.tsx:7:31 ❯ tests/InstanceLoad.test.ts:14:32 Module /home/runner/work/ir-engine/ir-engine/node_modules/@dimforge/rapier3d-compat/rapier.cjs.js:2 seems to be an ES Module but shipped in a CommonJS package. You might want to create an issue to the package "@dimforge/rapier3d-compat" asking them to ship the file in .mjs extension or add "type": "module" in their package.json. As a temporary workaround you can try to inline the package by updating your config: // vitest.config.js export default { test: { server: { deps: { inline: [ "@dimforge/rapier3d-compat" ] } } } }