Reason still looks like an ML-style language rather than something from the C family of things (where JavaScript ultimately comes from).
For example, in Reason, a function is:
let x: (int, int) => int = (a, b) => a + b;
A more JS-like syntax might be:
fn x(a, b int): int {
a + b
}
Or at least:
let x = fn(a, b int): int {
a + b
}