$t0. This type definition represents the interface to some
function that takes three, signed integers as parameters and returns a signed integer.
i64; that is, a 64-bit, signed integer!
importstatement tells us several things:
clock_time_getand lives in an external library called
$t0(on line 2) that this function must be passed an
i64as its second parameter; therefore, we can be certain that before this Wasm module can call function
clock_time_get(using the Wasmer-js polyfill), the interface must first be transformed.