Historically, our app has had 2 separate implementations of discount calculation logic: one in Rust that runs in the cart/checkout, and one in TypeScript that runs on product pages, collection pages, etc. This has led to a number of bugs and inconsistencies, as well as slowing down new feature releases, as features must be implemented in both. In fact, we've completely decided to not implement certain major, highly-complex features to the TypeScript version, such as "Buy X" steps. Instead, our long-term plan is to get rid of the TypeScript version and provide users with the Rust-based logic, in the form of a WebAssembly binary. (You can already use this today by setting the "Feature flags" setting of the "Discounts Embed" app embed to "useWasm".) The purpose of this feature request is to track our progress towards completely removing the TypeScript-based logic and using WebAssembly everywhere. Potential challenges: Ensuring this works in all browsers If we ever add Checkout UI extensions to our app, we will need to find a way to include WASM; otherwise, we can't get rid of the TS version completely.
