Building with Topcoat, the Rust framework that skips WebAssembly entirely

Topcoat is a pre-1.0 Rust web framework that server-renders HTML while compiling a limited subset of Rust expressions into JavaScript for browser interactivity, avoiding a WebAssembly build and using a roughly 15 KB gzipped shared runtime. A task-board example built with Topcoat 0.10.0 and Toasty 0.11.0 demonstrates local reactive signals for hiding completed tasks, server-rendered search through shards that return patched HTML, procedures for validated task moves, and WebSocket-backed live regions that refresh connected boards. The tutorial notes that production deployments need persistent storage, migrations, authentication, authorization, concurrency controls, shared event delivery across server instances, and more efficient update handling. It also highlights documented expression mismatches in version 0.10.0, including incorrect behavior for early returns within conditional runtime expressions and problems capturing nonfinite floating-point values, requiring developers to follow workarounds or use raw JavaScript when necessary. Compared with Rust frameworks such as Leptos and Dioxus, which commonly use WebAssembly, Topcoat emphasizes server-owned data and Rust-authored interactive pages, while leaving broader application infrastructure such as account management and administrative tooling to developers.

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