dtolnay/watt

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Runtime for executing procedural macros as WebAssembly

Stars: 1.5k
Forks: 31
Open beginner issues: 0
Indexed issues: 19

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Jul 19, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted
PR merge metrics: No merged PRs in 30d

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19 open issues indexed

Set up a benchmark of the runtime Open

help wanted

dtolnay/watt#1 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Hand off code to a preinstalled optimized runtime if available Open

help wanted

dtolnay/watt#2 · 33 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Consider adding a separate WASI runtime for build.rs isolation Open

help wanted

dtolnay/watt#3 · 4 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Panic info is compiled in Open

dtolnay/watt#5 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Debug info is compiled in Open

dtolnay/watt#6 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Tooling for verifying wasm was compiled from the public source Open

help wanted

dtolnay/watt#8 · 3 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Improve access to a precompiled wasm runtime Open

help wanted

dtolnay/watt#17 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Consider printing warning in non-JIT mode if any single invocation takes >100ms Open

help wanted

dtolnay/watt#19 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
JIT runtime failed to initiate panic Open

help wanted

dtolnay/watt#30 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Forwarding cargo features into the wasm Open

dtolnay/watt#35 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Mention that the Isolation property listed in the readme is not a security property Open

dtolnay/watt#38 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
`cargo watt` subcommand Open

dtolnay/watt#41 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
proc_macro instead of proc_macro2 Open

dtolnay/watt#42 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Addressing crate local state for procedural macros problem Open

dtolnay/watt#43 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Cannot depend on crates that depends on procedural macro? Open

dtolnay/watt#45 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
100x slower performance on serde_derive (with recent serde and syn?) Open

dtolnay/watt#47 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Any chance watt can be upstreamed to cargo? Open

dtolnay/watt#50 · 8 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
Demo build failing + Example module decode error Open

dtolnay/watt#54 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Pure Macros Open

dtolnay/watt#55 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

dtolnay/watt

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