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Diff for: ‎_posts/2019-02-28-this-week-in-rust-and-wasm-012.md

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---
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title: "This Week in Rust and WebAssembly 12"
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---
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Hello and welcome to another issue of *This Week in Rust and WebAssembly*!
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[Rust](https://rust-lang.org) is a systems language pursuing the trifecta:
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safety, concurrency, and speed.
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[WebAssembly](http://webassembly.org) is a stack-based virtual machine and
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instruction set. It is fast, safe, portable, and part of the open Web
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platform. By compiling to WebAssembly, we can run Rust code on the Web!
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This is a weekly summary of Rust and WebAssembly's progress and community.
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Did we miss something? Tweet to us at [@rustwasm](https://twitter.com/rustwasm)
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or [send us a pull request](https://github.com/rustwasm/rustwasm.github.io).
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**Want to get involved in Rust and WebAssembly? [Join the Rust and WebAssembly working group!][get-involved]**
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<!-- TODO: check recent r/rust and users.rust-lang.org posts for "wasm" and "webassembly": -->
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<!-- https://twitter.com/rustwasm -->
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## News and Blog Posts from Around the Web
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*Want to make sure something ends up on this list next time we publish an issue?
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[Leave a comment on this issue.](https://github.com/rustwasm/team/issues/79)*
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* [Replacing a hot path in your app's JavaScript with
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WebAssembly.](https://developers.google.com/web/updates/2019/02/hotpath-with-wasm)
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The article compares versions written in Rust, C/C++, and AssemblyScript.
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* [Was (not Wasm)](https://github.com/jedisct1/was-not-wasm) is a hostile
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allocator for AssemblyScript that is written in Rust.
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* Wasmer has [improved their startup time by
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100x](https://medium.com/wasmer/running-webassembly-100x-faster-%EF%B8%8F-a8237e9a372d).
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* [WebAssembly Troubles part 4: Microwasm.](http://troubles.md/posts/microwasm/)
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The culmination of a series of posts about issues the author has with
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WebAssembly, along with proposals for how to fix them.
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## Updates from [`rustwasm/*`](https://github.com/rustwasm)
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### RFCs
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#### New RFCs
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None.
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#### Final Comment Period RFCs
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* [Add support for local JavaScript snippets in
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`wasm-bindgen`](https://github.com/rustwasm/rfcs/pull/6)
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#### Merged RFCs
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None.
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### Working Group Meetings
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* [Watch the recording of this week's working group meeting on
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YouTube](https://www.youtube.com/watch?v=3YjN69U6ySE)
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* [Come join us at next week's working group
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meeting!](https://github.com/rustwasm/team/issues/258)
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### `rustwasm/rust-parcel-template`
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* @tock203 [fixed a
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`ReferenceError`](https://github.com/rustwasm/rust-parcel-template/pull/22) in
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the template's initialization code.
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### `rustwasm/twiggy`
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* @data-pup [set up
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`rustfmt`-checking](https://github.com/rustwasm/twiggy/pull/253) for our
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continuous integration.
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* @alexcrichton [made Twiggy account for header and section size
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bytes](https://github.com/rustwasm/twiggy/pull/250) of a Wasm binary, so
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Twiggy's output should sum to 100% now instead of just short of that.
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* @philipc [updated Twiggy to version 0.17.0 of
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`gimli`](https://github.com/rustwasm/twiggy/pull/247), the crate it uses to
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parse DWARF debugging information.
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* @alexcrichton [switched Twiggy over to using the `wasmparser`
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crate](https://github.com/rustwasm/twiggy/pull/245) to parse Wasm binaries,
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which gives more precise byte offset and size information, and is faster than
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the old Wasm parser.
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* @data-pup [added an unreachable items
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summary](https://github.com/rustwasm/twiggy/pull/244) to the `twiggy
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dominators` output, so that all top-level rows' sizes will sum to 100%.
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### `rustwasm/wasm-bindgen`
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* @tyleranton added support for [emitting doc
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comments](https://github.com/rustwasm/wasm-bindgen/pull/1302) in the
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TypeScript interface definition files that `wasm-bindgen` creates.
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* @LegNeato [fixed the `wasm-bindgen-test` headless browser test
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runner](https://github.com/rustwasm/wasm-bindgen/pull/1298) on macOS High
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Sierra.
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* @alexcrichton [updated the `wasm-bindgen`
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guide](https://github.com/rustwasm/wasm-bindgen/pull/1285) and added a
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"Deployment" section.
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* @alexcrichton [added support for the new `TextEncoder.prototype.encodeInto`
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method](https://github.com/rustwasm/wasm-bindgen/pull/1279) to
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`wasm-bindgen`'s generated JS glue when passing strings between wasm and JS.
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### `rustwasm/wasm-pack`
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* @ashleygwilliams [removed unnecessary
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entries](https://github.com/rustwasm/wasm-pack/pull/556) from the `"files"`
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key in `wasm-pack`'s generated `package.json`.
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* @ashleygwilliams [fixed the [wasm-pack] installer on
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windows](https://github.com/rustwasm/wasm-pack/pull/550) when it is downloaded
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multiple times and ends up with a `(1)` suffix in its filename.
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* @surma [wrote some docs on the `wee_alloc`
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integration](https://github.com/rustwasm/wasm-pack/pull/542) for the
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`wasm-pack` template.
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* @DebugSteven [wrote a series of get-started-in-X-environment
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tutorials](https://github.com/rustwasm/wasm-pack/pull/536) for `wasm-pack`.
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## Requests for Contribution
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**Want to get involved in Rust and WebAssembly? [Join the Rust and WebAssembly
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working group!][get-involved]**
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* [All issues labeled "good first issue" in the `rustwasm/*` repositories](https://github.com/issues?q=is%3Aopen+is%3Aissue+user%3Arustwasm+archived%3Afalse+label%3A%22good+first+issue%22)
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* [All issues labeled "help wanted" in the `rustwasm/*` repositories](https://github.com/issues?q=is%3Aopen+is%3Aissue+user%3Arustwasm+archived%3Afalse+label%3A%22help+wanted%22)
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[get-involved]: https://github.com/rustwasm/team/blob/master/README.md#get-involved
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### New Good First Issues
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* [`wasm-bindgen`: Add `#[wasm_bindgen(ignore)]` to ignore a `pub` field and not
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generate getters/setters for
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it](https://github.com/rustwasm/wasm-bindgen/issues/1284)

Diff for: ‎template.md

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* TODO: insert any new RFCs here. If none, add only
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"None". https://github.com/issues?q=repo%3Arustwasm%2Frfcs+created%3A%3E%3DYYYY-MM-DD
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#### Final Comment Period RFCs
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* TODO insert any RFCs in FCP here. If none, add only "None".
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#### Merged RFCs
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* TODO insert any merged RFCs here. If none, add only
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"none". https://github.com/issues?utf8=%E2%9C%93&q=repo%3Arustwasm%2Frfcs+merged%3A%3E%3DYYYY-MM-DD
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### Working Group Meetings
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* [Watch the recording of this week's working group meeting on
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YouTube](https://www.youtube.com/watch?v=3YjN69U6ySE)
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* [Come join us at next week's working group
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meeting!](https://github.com/rustwasm/team/issues/258)
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<!-- TODO: insert links to everything labeled "TWiRaWA" here. Categorize by repo, -->
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<!-- alphetical order. -->
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<!-- https://github.com/issues?q=user%3Arustwasm+label%3ATWiRaWA+merged%3A%3E%3DYYYY-MM-DD+ -->

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