Whether the given module is the TypeScript fallback rather than the
compiled WASM backend. initWasm returns a TypeScriptFallback
when the compiled module can't be loaded (e.g. not built in dev), so
callers can report the active backend accurately instead of always
claiming "WASM loaded".
Whether the given module is the TypeScript fallback rather than the compiled WASM backend. initWasm returns a TypeScriptFallback when the compiled module can't be loaded (e.g. not built in dev), so callers can report the active backend accurately instead of always claiming "WASM loaded".