Function js_sys::Atomics::wait_async_bigint

pub fn wait_async_bigint(
    typed_array: &BigInt64Array,
    index: u32,
    value: i64
) -> Result<Object, JsValue>

The static Atomics.waitAsync() method verifies that a given position in an Int32Array still contains a given value and if so sleeps, awaiting a wakeup or a timeout. It returns an object with two properties. The first property async is a boolean which if true indicates that the second property value is a promise. If async is false then value is a string whether equal to either “not-equal” or “timed-out”. Note: This operation only works with a shared BigInt64Array and may be used on the main thread.

You should use wait_async to operate on a Int32Array.

MDN documentation