Published typex, a Rust library for runtime reflection. It can inspect, traverse and mutate objects without knowing their concrete types. The crate supports no_std and has no runtime dependencies or unsafe code.

For example, you can batch mutations and roll them back:

use typex::{MutationBatch, PatchOperation, PathSegment};

let mut values = vec![1_u8];
let batch = MutationBatch::from([
  PatchOperation::set([PathSegment::Item(0)], 2_u8),
  PatchOperation::push_item([], 3_u8),
]);

let rollback = batch.commit(&mut values).unwrap(); // [2, 3]
rollback.undo(&mut values).unwrap();               // [1]

Early benchmarks show faster builds and reflection operations than facet and bevy_reflect.