Compile native Jac modules to WebAssembly and run them in the browser.
npx skills add https://github.com/PMN123/trapdoor --skill jac-native-wasm-pmn123
Please help me install this Agent Skill. Skill: jac-native-wasm Source: https://github.com/PMN123/trapdoor/tree/main/.agents/skills/jac-native-wasm Command: npx skills add https://github.com/PMN123/trapdoor --skill jac-native-wasm-pmn123
.na.jac module from client code so the build emits /static/<stem>.wasm and binds lazy async stubs automatically. - FFI via set_na_env: Register JS implementations for extern-declared imports (raylib-style) before the first stub call, with direct access to .exports and .mem. - Raw ABI mechanics: Covers __jac_glob_init(), BigInt i64 marshalling, libc import surfaces discovered via WebAssembly.Module.imports, and standalone jac nacompile --target wasm32 builds. - Use Case: Build an in-browser game loop or simulation where a native Jac module (e.g., a physics or prime-counting kernel) runs per requestAnimationFrame with no server involved. ## Quick Start Use the jac-native-wasm skill to compile my native Jac module to WebAssembly and call it from my client page with na import.High-intent search queries and answers about installing and using this skill.
Keep the native code in a .na.jac module and use na import from client code; the build emits /static/<stem>.wasm and generates lazy async stubs. Each call is awaited, and the module instantiates on first call.
Run jac nacompile primes.jac --target wasm32 -o primes.wasm to emit a valid wasm module without a server. Instantiate it in JS, call __jac_glob_init() once, then invoke exports with BigInt arguments.
Jac int is i64 and crosses the wasm boundary as BigInt, so passing a plain JS number throws a TypeError. Pass BigInt(20000) and convert BigInt returns with Number() or f-string interpolation before arithmetic.
Discover the exact set with WebAssembly.Module.imports(mod) rather than guessing. Modules that allocate lists, dicts, or strings import libc symbols like malloc, free, memcpy, printf, and abort, and every listed import must be present or instantiation throws.
Yes, each extern becomes a wasm import the JS host supplies instead of linking a native library. Register the JS implementations with set_na_env before the first stub call, as demonstrated by the raylib_shooter web example.
nihalnihalaniExplains how the Jac compiler infers client, server, and native code placement.
egorfedorovEnforce WebAssembly artifact contracts and validate bundle integrity across build, load, and runtime phases.
nihalnihalaniCompile native Jac code to WebAssembly and run it in the browser.
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