{"id":40883573,"url":"https://github.com/renderhq/raw-bits-to-react","last_synced_at":"2026-02-15T16:07:23.183Z","repository":{"id":311617786,"uuid":"1044309655","full_name":"renderhq/raw-bits-to-react","owner":"renderhq","description":"master every layer of frontend engineering: cpu → networking → browser → js → dom → rendering → performance → react internals → ssr → optimization in 12 weeks ","archived":false,"fork":false,"pushed_at":"2025-12-26T13:00:11.000Z","size":18,"stargazers_count":843,"open_issues_count":0,"forks_count":48,"subscribers_count":4,"default_branch":"main","last_synced_at":"2026-01-22T12:56:21.016Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":"","language":null,"has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/renderhq.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null,"notice":null,"maintainers":null,"copyright":null,"agents":null,"dco":null,"cla":null}},"created_at":"2025-08-25T13:45:05.000Z","updated_at":"2026-01-21T18:47:25.000Z","dependencies_parsed_at":"2025-08-25T15:45:01.313Z","dependency_job_id":"1188e3e4-49ad-45ea-8df2-d5d538cd6e5c","html_url":"https://github.com/renderhq/raw-bits-to-react","commit_stats":null,"previous_names":["pavanscales/raw-bits-to-react","renderhq/raw-bits-to-react"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/renderhq/raw-bits-to-react","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/renderhq%2Fraw-bits-to-react","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/renderhq%2Fraw-bits-to-react/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/renderhq%2Fraw-bits-to-react/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/renderhq%2Fraw-bits-to-react/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/renderhq","download_url":"https://codeload.github.com/renderhq/raw-bits-to-react/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/renderhq%2Fraw-bits-to-react/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":29483481,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-02-15T15:33:17.885Z","status":"ssl_error","status_checked_at":"2026-02-15T15:32:53.698Z","response_time":118,"last_error":"SSL_read: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2026-01-22T01:31:16.221Z","updated_at":"2026-02-15T16:07:23.165Z","avatar_url":"https://github.com/renderhq.png","language":null,"funding_links":[],"categories":[],"sub_categories":[],"readme":"# From CPU to the Browser\n**The definitive low-level frontend engineering course**\n\nMaster every layer from bare metal to production React. Build browsers, engines, and frameworks from scratch.\n\n---\n\n## Week 0.5 – CPU \u0026 Memory Architecture\n\nHardware Fundamentals\n\nCPU basics: fetch, decode, execute, writeback\n\nRegisters \u0026 instructions: basic register usage, simple instruction scheduling\n\nBranching \u0026 pipelines: branch prediction, avoiding pipeline stalls\n\nCache basics: L1/L2/L3, cache lines\n\nMemory: stack vs heap, virtual memory basics\n\nLow-level execution:\n\nSystem calls overview\n\nMemory layout: text, data, stack, heap\n\nPointers and simple memory alignment\n\n## Week 1 – Networking from Scratch\n\nSocket programming: TCP \u0026 UDP sockets\n\nTCP basics: three-way handshake, flow control\n\nHTTP basics: parsing headers, chunked encoding, keep-alive\n\nTLS basics: handshake overview, certificate check (no deep crypto math)\n\nWebSocket basics: upgrade handshake, simple frame handling\n\nNetwork debugging:\n\ntcpdump / Wireshark basics\n\nsimulate network latency and packet loss\n\n---\n\n## Weeks 2-3 – Browser Engine Implementation\n\n**HTML parsing**\n- Tokenization state machine (13 states, 67 transitions)\n- Tree construction algorithm\n- Error recovery and quirks mode\n- Parser-blocking scripts and async/defer\n\n**CSS engine**\n- Tokenizer and parser (grammar implementation)\n- Selector matching with specificity calculation\n- Cascade resolution algorithm\n- Style computation and inheritance\n- Media query evaluation\n\n**Layout engine**\n- Box model calculation\n- Normal flow, floats, positioning schemes\n- Flexbox algorithm: main/cross axis, flex basis, grow, shrink\n- Grid algorithm: track sizing, placement, spanning\n- Line breaking and text shaping\n\n**Paint and composite**\n- Layer tree construction\n- Paint recording and display lists\n- Rasterization strategies\n- GPU compositing and texture management\n\n**Project:** Build a browser engine in C++ or Rust that renders Wikipedia. Handle fonts, images, CSS animations. Measure every phase: parse, style, layout, paint, composite.\n\n---\n\n## Weeks 4-5 – JavaScript Engine\n\n**Parsing and AST**\n- Lexical analysis and tokenization\n- Recursive descent parser\n- AST construction and validation\n- Scope analysis and symbol resolution\n\n**Interpreter implementation**\n- Bytecode design and instruction set\n- Stack-based VM execution\n- Closure implementation with environment chains\n- Prototype chain traversal\n- Property lookup optimization (inline caches)\n\n**Memory management**\n- Mark-and-sweep garbage collection\n- Generational collection (young/old generations)\n- Incremental and concurrent GC\n- WeakMap and WeakSet implementation\n- Memory profiling and leak detection\n\n**Event loop mechanics**\n- Microtask queue (Promise.then)\n- Macrotask queue (setTimeout, I/O)\n- Animation frame callbacks\n- Idle callbacks and scheduling\n- Task prioritization\n\n**Optional: JIT compilation**\n- Inline caching and polymorphic inline caching\n- Type feedback and speculative optimization\n- Deoptimization and bailout mechanisms\n- Register allocation\n\n**Project:** JS engine executing real programs. Implement closures, prototypes, async/await, event loop. Profile GC pauses and optimize hot paths. Connect to DOM for interactive apps.\n\n---\n\n## Week 6 – Virtual DOM \u0026 Reconciliation\n\n**Diffing algorithms**\n- Tree diffing complexity analysis (O(n³) → O(n))\n- Key-based reconciliation\n- Heuristics: component type, element type, lists\n- Fiber architecture preparation\n\n**Batching and scheduling**\n- Requestanimationframe-based updates\n- Double buffering for UI consistency\n- Priority queues for updates\n- Time slicing for interruptibility\n\n**Repaint/reflow optimization**\n- Layout thrashing detection\n- Read/write batching (FastDOM pattern)\n- CSS containment and layer creation\n- Composite-only animations\n\n**Project:** Virtual DOM library with optimized reconciliation. Stress test with 10,000+ dynamic nodes. Profile layout/paint timings.\n\n---\n\n## Week 7 – React/Next.js Internals\n\n**Fiber reconciler**\n- Work loop and unit of work\n- Reconciliation phases: render and commit\n- Effect list construction\n- Priority levels and lane model\n\n**Hooks implementation**\n- Hooks queue and cursor\n- useEffect cleanup and dependency checking\n- useRef mutable container\n- useCallback/useMemo memoization\n- Custom hook composition\n\n**Concurrent features**\n- Time slicing and work interruption\n- Suspense and lazy loading\n- useTransition and useDeferredValue\n- Automatic batching\n\n**Server-side rendering**\n- renderToString vs renderToPipeableStream\n- Progressive hydration and selective hydration\n- Double pass problem and solutions\n- Edge rendering vs Node rendering\n\n**Next.js architecture**\n- File-based routing implementation\n- SSG: getStaticProps build-time execution\n- ISR: revalidation and stale-while-revalidate\n- API routes and middleware\n- Module bundling and code splitting\n\n**Project:** Clone React's core reconciler with Fiber and hooks. Build SSR framework with streaming and hydration. Implement file-based routing.\n\n---\n\n## Week 8 – Performance Engineering\n\n**Profiling tools**\n- Chrome DevTools: Performance tab deep dive\n- React DevTools Profiler\n- Lighthouse metrics: FCP, LCP, TTI, CLS, FID\n- Custom performance marks and measures\n- Heap snapshots and allocation timelines\n\n**Optimization techniques**\n- Component memoization strategies\n- Virtualized lists and windowing\n- Image optimization: formats, lazy loading, responsive images\n- Font optimization: subsetting, preloading, display strategies\n- Bundle analysis and tree shaking\n- Code splitting strategies: route-based, component-based\n\n**Critical rendering path**\n- Eliminate render-blocking resources\n- Minimize critical CSS\n- Defer non-critical JavaScript\n- Preload/prefetch/preconnect strategies\n\n**Project:** Optimize real-world app from 3s to \u003c1s LCP. Document every optimization with before/after metrics. Handle 60fps animations with heavy DOM updates.\n\n---\n\n## Week 9 – Engine Modification \u0026 Debugging\n\n**JavaScript engine hacking**\n- Build V8 from source with custom patches\n- Add custom bytecode instructions\n- Instrument GC for detailed metrics\n- Profile JIT compilation decisions\n\n**Browser engine debugging**\n- Build Chromium/WebKit from source\n- Add custom tracing to layout engine\n- Modify rendering pipeline for instrumentation\n- Debug compositor thread interactions\n\n**WebAssembly integration**\n- Compile C/C++/Rust to WASM\n- Linear memory management\n- JS ↔ WASM interop optimization\n- SIMD and threads\n\n**Project:** Add custom profiling to browser engine. Build WASM module for computationally intensive task (image processing, physics simulation). Optimize JS/WASM boundary.\n\n---\n\n## Week 10 – Hardware Simulation \u0026 Constraints\n\n**Embedded systems**\n- Run minimal browser on microcontroller simulation\n- Memory-constrained rendering (64KB RAM)\n- CPU-constrained JavaScript (10MHz)\n- Display optimization for small screens\n\n**Stress testing**\n- Memory pressure simulation\n- CPU throttling\n- Network constraint testing (2G, 3G)\n- GPU bottleneck analysis\n\n**Project:** Port mini-browser to embedded environment. Optimize for extreme constraints. Document performance characteristics.\n\n---\n\n## Weeks 11-12 – Capstone Project\n\n**Build a complete system:**\n\n1. Custom browser engine with HTML/CSS/JS support\n2. React-like framework with Fiber and concurrent features\n3. SSR framework with streaming and hydration\n4. Production-optimized Next.js application\n5. Full performance profiling suite\n6. WebAssembly acceleration for critical paths\n7. Hardware constraint testing and optimization\n\n**Requirements:**\n- Render complex UIs at 60fps\n- Handle 10,000+ concurrent DOM updates\n- Sub-second initial page load\n- Progressive enhancement and graceful degradation\n- Comprehensive error handling and edge cases\n- Full performance documentation\n\n**Deliverable:** Production-ready system with complete understanding of every layer from CPU to pixels.\n\n---\n\n## Prerequisites\n\n- Strong C/C++ or Rust\n- Computer architecture knowledge\n- Operating systems fundamentals\n- Data structures and algorithms mastery\n\n## Outcome\n\nYou will understand and have built:\n- CPU execution and memory management\n- Network protocols and servers\n- Browser engines (parsing, layout, paint, composite)\n- JavaScript engines (parser, interpreter, GC, event loop)\n- Virtual DOM and reconciliation\n- React internals and concurrent rendering\n- SSR and hydration systems\n- Performance profiling and optimization\n\nYou'll debug and optimize at every level of the stack with complete confidence.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frenderhq%2Fraw-bits-to-react","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Frenderhq%2Fraw-bits-to-react","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Frenderhq%2Fraw-bits-to-react/lists"}