Troubleshooting

Handling ReferenceError: WebAssembly is not defined

Reassure, by default, uses Node.js's --jitless flag to disable its optimizing compiler to increase test stability. This flag prevents WebAssembly (WASM) from running because of internal Node.js architecture. In some cases, you might still allow your tests to include code depending on WASM, e.g., the fetch method is implemented using WASM.

In such cases, pass the --enable-wasm flag to Reassure CLI:

$ reassure --enable-wasm

This option will replace the Node.js --jitless flag with alternative flags to achieve a similar stabilizing effect.

Note that this option is experimental and may negatively affect the stability of your tests.