If enabled, targets the WebAssembly.Table language feature, which results in faster JS-Wasm interop and faster build times. WebAssembly.Table is not backwards compatible with the older dynCalls interop model. If disabled, Unity targets the old deprecated Emscripten -sDYNCALLS flag for backwards compatibility with older Unity Web platform JS plugin code. It is recommended to enable this option for new projects that do not utilize any older incompatible JavaScript plugins, and when you prefer fast build iteration times, and to disable it if utilizing.jslib files that rely on the older dynCall() mechanism.

public static bool webAssemblyTable { get; set; }