faf-wasm-gen

Rust WASM Generator for FAF (Foundational AI-context Format)

Generate project.faf files in the browser or at the edge.

⭐ Bookmarks it for you, helps other devs find it too.

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Mission

Build a Rust WASM generator that matches faf-cli v6.8 output exactly (faf_version "3.3", 33-slot Mk4 model).

Spec: See SPEC.md for complete implementation specification.

Bible: /Users/wolfejam/FAF/cli (faf-cli v6.8) — src/core/slots.ts

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Deployment Targets

Target	Platform	Purpose
builder.faf.one	Vercel	Traditional .faf generation (browser + download/commit)
MCPaaS.live	Cloudflare Workers	MCP generation at edge (+ GitHub commit)
FAF-Builder	Vercel	Generic version of builder.faf.one

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Architecture

DOUBLE-WHAMMY:

• This repo (Rust WASM): Generate .faf (211KB)
• xai-faf-zig (Zig WASM): Score .faf (2.7KB)

Combined: ~213KB total, sub-5ms generation + scoring

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Build

Quick Build (if rustup is properly configured)

wasm-pack build --target web --release

Alternative Build (rustup + Homebrew Rust conflict workaround)

If you have both rustup and Homebrew Rust installed on macOS:

# Build WASM binary
RUSTC=~/.rustup/toolchains/stable-x86_64-apple-darwin/bin/rustc \
  ~/.rustup/toolchains/stable-x86_64-apple-darwin/bin/cargo \
  build --target wasm32-unknown-unknown --release

# Generate JS glue code (requires wasm-bindgen-cli)
cargo install wasm-bindgen-cli
wasm-bindgen target/wasm32-unknown-unknown/release/faf_wasm_gen.wasm \
  --out-dir pkg --target web

Output:

• pkg/faf_wasm_gen_bg.wasm (WASM binary ~1.2MB)
• pkg/faf_wasm_gen.js (JS glue code)

Optimization:

Optimized binary included in pkg/ (1.04MB final):

wasm-opt -Oz \
  --enable-mutable-globals \
  --enable-bulk-memory \
  --enable-nontrapping-float-to-int \
  --enable-sign-ext \
  --converge \
  --strip-debug --strip-dwarf --strip-producers \
  target/wasm32-unknown-unknown/release/faf_wasm_gen.wasm \
  -o pkg/faf_wasm_gen_bg.wasm

Size Breakdown:

• Original: 1.19MB
• Optimized: 1.04MB (11.9% reduction)
• regex: ~300KB (README pattern matching)
• chrono: ~200KB (timestamp generation)
• serde/serde_json: ~150KB (JSON parsing)
• Core logic: ~400KB

Note: 1.04MB is production-ready. Further reduction to 200-250KB would require removing dependencies and sacrificing features (regex extraction, JSON parsing, etc.).

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Deploy

To builder.faf.one:

cp pkg/*.wasm /Users/wolfejam/FAF/grok-faf-elite/static/
cp pkg/*.js   /Users/wolfejam/FAF/grok-faf-elite/static/

To MCPaaS:

cp pkg/*.wasm /Users/wolfejam/FAF/mcpaas-cf/src/
cp pkg/*.js   /Users/wolfejam/FAF/mcpaas-cf/src/

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Test

Must pass WJTTC test suite against faf-cli as ground truth:

cargo test

Test repos:

• grok-1 (Python/JAX, data-science type)
• test-faf-demo (JavaScript/React)
• faf-cli (TypeScript CLI)

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Success Criteria

✅ Generates current faf_version "3.3" / 33-slot Mk4 .faf ✅ Canonical app types (data-science, frontend, mcp, library, …) ✅ slotignored for slots outside the type's active categories ✅ Round-trips through faf-cli's scorer (mcp 17 / frontend 16 / library 12 active slots) ✅ No "Unknown" hardcoding; score computed on read (not stored)

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Status

Implementation: Complete ✅ (730 lines Rust) Tests: 7/7 passing ✅ (4 unit + 3 integration) WASM Build: Optimized ✅ (1.04MB final, 11.9% reduction from 1.19MB) Grok-1 Test: 85% ◇ Bronze (handoff_ready: true) Owner: wolfejam Date: 2026-02-07

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Links

• SPEC.md - Complete implementation specification
• faf-cli - Reference implementation (the bible)
• xai-faf-zig - Zig WASM scorer (2.7KB)

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Built with 🦀 Rust + WASM for the edge