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README: add features section describing goals/foundations/features of wasm-bindgen

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Nick Fitzgerald 2018-08-29 14:23:20 -07:00
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@ -38,6 +38,27 @@ import { greet } from "./hello_world";
greet("World!"); greet("World!");
``` ```
## Features
* **Lightweight.** Only pay for what you use. `wasm-bindgen` only generates
bindings and glue for the JavaScript imports you actually use and Rust
functionality that you export. For example, importing and using the
`document.querySelector` method doesn't cause `Node.prototype.appendChild` or
`window.alert` to be included in the bindings as well.
* **ECMAScript modules.** Just import WebAssembly modules the same way you would
import JavaScript modules. Future compatible with [WebAssembly modules and
ECMAScript modules integration][wasm-es-modules].
* **Designed with the ["host bindings" proposal][host-bindings] in mind.**
Eventually, there won't be any JavaScript shims between Rust-generated wasm
functions and native DOM methods. Because the wasm functions are statically
type checked, some of those native methods' dynamic type checks should become
unnecessary, promising to unlock even-faster-than-JavaScript DOM access.
[wasm-es-modules]: https://github.com/WebAssembly/esm-integration
[host-bindings]: https://github.com/WebAssembly/host-bindings/blob/master/proposals/host-bindings/Overview.md
## Guide ## Guide
[📚 Read the `wasm-bindgen` guide here! 📚](https://rustwasm.github.io/wasm-bindgen) [📚 Read the `wasm-bindgen` guide here! 📚](https://rustwasm.github.io/wasm-bindgen)