This Week in Rust and WebAssembly 12

Hello and welcome to another issue of This Week in Rust and WebAssembly!

Rust is a systems language pursuing the trifecta: safety, concurrency, and speed.

WebAssembly is a stack-based virtual machine and instruction set. It is fast, safe, portable, and part of the open Web platform. By compiling to WebAssembly, we can run Rust code on the Web!

This is a weekly summary of Rust and WebAssembly’s progress and community.

Did we miss something? Tweet to us at @rustwasm or send us a pull request.

Want to get involved in Rust and WebAssembly? Join the Rust and WebAssembly working group!

News and Blog Posts from Around the Web

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Replacing a hot path in your app’s JavaScript with WebAssembly. The article compares versions written in Rust, C/C++, and AssemblyScript.
Was (not Wasm) is a hostile allocator for AssemblyScript that is written in Rust.
Wasmer has improved their startup time by 100x.
WebAssembly Troubles part 4: Microwasm. The culmination of a series of posts about issues the author has with WebAssembly, along with proposals for how to fix them.
Generating snow with Rust and Wasm
- Live demo
- Source

Updates from `rustwasm/*`

RFCs

New RFCs

None.

Final Comment Period RFCs

Add support for local JavaScript snippets in wasm-bindgen

Merged RFCs

None.

Working Group Meetings

`rustwasm/rust-parcel-template`

@tock203 fixed a ReferenceError in the template’s initialization code.

`rustwasm/twiggy`

@data-pup set up rustfmt-checking for our continuous integration.
@alexcrichton made Twiggy account for header and section size bytes of a Wasm binary, so Twiggy’s output should sum to 100% now instead of just short of that.
@philipc updated Twiggy to version 0.17.0 of gimli, the crate it uses to parse DWARF debugging information.
@alexcrichton switched Twiggy over to using the wasmparser crate to parse Wasm binaries, which gives more precise byte offset and size information, and is faster than the old Wasm parser.
@data-pup added an unreachable items summary to the twiggy dominators output, so that all top-level rows’ sizes will sum to 100%.

`rustwasm/wasm-bindgen`

@tyleranton added support for emitting doc comments in the TypeScript interface definition files that wasm-bindgen creates.
@LegNeato fixed the wasm-bindgen-test headless browser test runner on macOS High Sierra.
@alexcrichton updated the wasm-bindgen guide and added a “Deployment” section.
@alexcrichton added support for the new TextEncoder.prototype.encodeInto method to wasm-bindgen’s generated JS glue when passing strings between wasm and JS.

`rustwasm/wasm-pack`

@ashleygwilliams removed unnecessary entries from the "files" key in wasm-pack’s generated package.json.
@ashleygwilliams fixed the [wasm-pack] installer on windows when it is downloaded multiple times and ends up with a (1) suffix in its filename.
@surma wrote some docs on the wee_alloc integration for the wasm-pack template.
@DebugSteven wrote a series of get-started-in-X-environment tutorials for wasm-pack.

Requests for Contribution