Namespace

Every crate has a UniFFI "namespace". This is the name exposed to the foreign bindings, typically as a module.

For example, if our namespace is math, and we have Rust code:

#[uniffi::export] // if using proc-macros
fn exp(a: f64) -> f64 { ... }

you might find foreign code doing:

from math import exp # python

import math // swift

import omg.wtf.math.exp // kotlin

If you use UDL, it must have a namespace block:

namespace math {
  double exp(double a);
};

Proc-macros don't need do anything unless the namespace name is different from the crate name, in which case it can be overridden with

uniffi::setup_scaffolding!("math");