Create a new programming language for websites that is more efficient and quicker than anything currently out there.

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.1)** --- **Core Design Principles** - Compiled to optimized WASM bytecode, not interpreted - Unified syntax handles UI, logic, and data — no framework layering - Reactive by default; no virtual DOM diffing needed - Zero-cost abstractions: pay only for what you use --- **Syntax Sample — Reactive Component** ```velo page Home { state count: int = 0 view { button(@click: count++) "Clicked {count} times" text(if count > 9: "That's a lot!" else: "") } } ``` --- **Key Innovations** | Feature | Benefit | |---|---| | Direct WASM compile | Skips JS engine overhead entirely | | Granular reactivity | Updates only changed DOM nodes | | Built-in fetch types | `get<User>("/api/user")` — typed network calls | | Scope-inferred memory | No GC pauses; deterministic cleanup | --- **Typed Network Call** ```velo type User { name: str, age: int } async load() { user = get<User>("/api/user") render(user.name) } ``` --- **Efficiency Targets** - Cold start: < 5ms (vs React ~200ms) - Bundle baseline: < 8KB runtime - Memory: static allocation by default --- *Next build: error handling model and module system.*

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.2)** --- **Core Design Principles** - Compiled to optimized WASM bytecode, not interpreted - Unified syntax handles UI, logic, and data — no framework layering - Reactive by default; no virtual DOM diffing needed - Zero-cost abstractions: pay only for what you use --- **Syntax Sample — Reactive Component** ```velo page Home { state count: int = 0 view { button(@click: count++) "Clicked {count} times" text(if count > 9: "That's a lot!" else: "") } } ``` --- **Key Innovations** | Feature | Benefit | |---|---| | Direct WASM compile | Skips JS engine overhead entirely | | Granular reactivity | Updates only changed DOM nodes | | Built-in fetch types | `get<User>("/api/user")` — typed network calls | | Scope-inferred memory | No GC pauses; deterministic cleanup | --- **Typed Network Call** ```velo type User { name: str, age: int } async load() { user = get<User>("/api/user") render(user.name) } ``` --- **Error Handling Model** ```velo result load() -> User | Err { user = get<User>("/api/user") catch e: log(e); return Err return user } ``` Result types compile to WASM tagged unions; no exceptions or stack unwinding. **Module System** ```velo mod api { export load() } import api.load from "./api.velo" ``` Modules map 1:1 to WASM modules; tree-shaken at compile time. **Efficiency Targets** - Cold start: < 5ms (vs React ~200ms) - Bundle baseline: < 8KB runtime - Memory: static allocation by default --- *Next: concurrency primitives.*

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.3)** --- **Core Design Principles** - Compiled to optimized WASM; no interpreter overhead - Unified syntax for UI, logic, and data — no framework layers - Reactive by default; direct-to-DOM updates (no Virtual DOM) - Zero-cost abstractions and scope-inferred memory --- **Syntax Sample — Reactive Component** ```velo page Home { state count: int = 0 view { button(@click: count++) "Clicked {count} times" text(if count > 9: "That's a lot!" else: "") } } ``` --- **Error Handling & Modules** ```velo result fetchUser() -> User | Err { user = get<User>("/api/user") catch e: log(e); return Err return user } // Modules map 1:1 to WASM modules, tree-shaken at compile time import { fetchUser } from "./api.velo" ``` --- **Concurrency Primitives** VeloScript implements lock-free, lightweight fibers (`task`) communicating via typed channels, avoiding UI-thread blocking by compiling directly to WASM web workers. ```velo chan data_chan: str task background_loader() { // Non-blocking wait for data msg = <-data_chan log("Received: {msg}") } async main() { spawn background_loader() data_chan <- "payload" // Send to fiber } ``` --- **Key Innovations & Targets** - **Direct WASM Compile:** Skips JS engine compilation entirely - **Granular Reactivity:** Updates only targeted DOM nodes - **Memory:** Deterministic cleanup without Garbage Collection pauses - **Cold start:** < 5ms (vs React ~200ms) | **Runtime bundle:** < 8KB --- *Next: DOM rendering pipeline and interop layer with legacy JS.*

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.4)** ### Architecture - Ahead-of-time compilation to optimized WASM - Compile-time dependency graph for fine-grained reactivity - Deterministic ownership with explicit shared/reference types - Typed results instead of exceptions - Structured tasks mapped to workers where beneficial ### DOM Rendering Pipeline WASM cannot currently access the browser DOM directly. VeloScript therefore emits: 1. A compact WASM module containing application logic 2. A minimal generated JS host adapter for DOM and Web APIs 3. Static HTML where content is known at build time 4. Numeric node and event IDs, avoiding selectors during updates ```velo page Counter { state count: int = 0 view { button(@click: count += 1) "Clicked {count} times" text(if count > 9: "That's a lot!" else: "") } } ``` Compiler output conceptually becomes: ```text bind event 0 -> increment bind text 1 -> format(count) on count change -> setText(1, format(count)) ``` No runtime tree diff occurs. State writes schedule only statically dependent bindings; updates are batched once per microtask. ### JavaScript Interop ```velo extern js module "chart.js" { fn render(target: DomRef, values: view<f64>) -> JsResult<void> } effect draw(chart: DomRef, values: vec<f64>) { js chart.render(chart, borrow values) catch err { log.error(err.message) } } ``` Interop rules: - All JS boundaries are explicit and type-checked - Strings and buffers use borrowed views when safe - JS references are opaque handles released deterministically - DOM mutation is restricted to `effect` blocks - Unsafe dynamic calls require `extern js unsafe` ### Hydration and Delivery Server rendering emits binding IDs into HTML.…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.5)** ### Architecture - Ahead-of-time compilation to optimized WASM - Compile-time dependency graph for fine-grained reactivity - Deterministic ownership with explicit shared/reference types - Typed results instead of exceptions - Structured tasks mapped to workers where beneficial ### DOM Rendering Pipeline Compiler emits numeric binding IDs; state writes schedule only statically dependent bindings, batched once per microtask. No runtime diff. ### JavaScript Interop All JS boundaries explicit and type-checked; DOM mutation restricted to `effect` blocks. ### Hydration and Delivery Server rendering emits binding IDs into HTML. The WASM module hydrates by attaching to existing nodes rather than re-rendering. ```velo server page ProductDetail(id: int) { product = get<Product>("/api/product/{id}") view { h1 product.name text "${product.price}" button(@click: addToCart(id)) "Add to Cart" } } ``` - Static nodes emit as plain HTML; no WASM cost until interaction - Interactive nodes carry `data-vid` binding IDs - Hydration cost: O(interactive nodes), not O(page size) - Streaming: server flushes above-fold HTML before data resolves ### Type System ```velo type Product { name: str, price: f64, stock: int } type Cart { items: vec<Product>, total: f64 } // Compile-time enforcement: read-only view cannot mutate source fn displayPrice(p: view<Product>) -> str { "${p.price:.2f}" } ``` - `view<T>` — borrowed read-only reference, zero-copy - `own<T>` — single owner, deterministic drop - `shared<T>` — reference-counted, explicit in signature - Nullability encoded as `T | None`; no implicit null **Efficiency Targets** - Cold start: < 5ms | Runtime: < 8KB | Hydration: O(interactive…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.6)** ### Architecture - Ahead-of-time compilation to optimized WASM - Compile-time dependency graph for fine-grained reactivity - Deterministic ownership with explicit shared/reference types - Typed results instead of exceptions - Structured tasks mapped to workers where beneficial ### DOM Rendering Pipeline Compiler emits numeric binding IDs; state writes schedule only statically dependent bindings, batched once per microtask. No runtime diff. ### JavaScript Interop All JS boundaries explicit and type-checked; DOM mutation restricted to `effect` blocks. ### Hydration and Delivery Server rendering emits binding IDs into HTML. The WASM module hydrates by attaching to existing nodes rather than re-rendering. ```velo server page ProductDetail(id: int) { product = get<Product>("/api/product/{id}") view { h1 product.name text "${product.price}" button(@click: addToCart(id)) "Add to Cart" } } ``` - Static nodes emit as plain HTML; no WASM cost until interaction - Interactive nodes carry `data-vid` binding IDs - Hydration cost: O(interactive nodes), not O(page size) - Streaming: server flushes above-fold HTML before data resolves ### Type System ```velo type Product { name: str, price: f64, stock: int } type Cart { items: vec<Product>, total: f64 } fn displayPrice(p: view<Product>) -> str { "${p.price:.2f}" } ``` - `view<T>` — borrowed read-only reference, zero-copy - `own<T>` — single owner, deterministic drop - `shared<T>` — reference-counted, explicit in signature - Nullability encoded as `T | None`; no implicit null ### Concurrency Lock-free fibers (`task`) over typed channels compile to WASM workers. ```velo chan updates: Product task loader() { p = <-updates;…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.7)** ### Architecture & Memory - **AOT to WASM:** Compiles to optimized WebAssembly. - **No GC Pauses:** Uses scope-inferred deterministic ownership. - **Reactivity:** Compile-time dependency tracking without a Virtual DOM. - **Types:** Borrowed views (`view<T>`), single owners (`own<T>`), ref-counted (`shared<T>`), and `T | None`. ### DOM Pipeline & Hydration Compiler emits numeric binding IDs (`data-vid`). The host adapter binds WASM logic to targeted DOM nodes instantly. Server-side rendering flushes plain HTML first; hydration scales strictly with the number of interactive nodes ($O(I)$), not the document size ($O(N)$). ### JavaScript Interop & Concurrency DOM mutations reside solely in `effect` blocks. For off-thread operations, VeloScript compiles lightweight lock-free tasks directly to WASM Web Workers. ```velo extern js module "chart.js" { fn render(target: DomRef, values: view<f64>) -> JsResult<void> } chan updates: Product task loader() { product = <-updates // Off-thread logic here } async main() { spawn loader() updates <- get<Product>("/api/product/1") catch e: return } ``` ### Server-Side Rendering (SSR) ```velo server page ProductDetail(id: int) { product = get<Product>("/api/product/{id}") view { h1 product.name text "${product.price}" button(@click: addToCart(id)) "Add to Cart" } } ``` ### Performance Benchmarks - **Cold Start:** < 5ms (Static layout binding) - **Runtime Size:** < 8KB (No runtime compiler/diff engine) - **Memory Overhead:** Near-zero GC pressure, minimal heap allocation.

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.8)** ### Execution Model - AOT compilation to optimized WASM for logic and a generated, tree-shaken JS host for DOM/Web APIs - Compile-time reactive graph; state changes update only dependent bindings - Static HTML plus resumable interactive islands; no virtual DOM or full-tree hydration - Deterministic ownership: `own<T>`, borrowed `view<T>`, explicit `shared<T>` - Typed `Result<T,E>` and `T | None`; no implicit exceptions or nulls ```velo island Counter { state count: i32 = 0 view { button(@click: count += 1) "Clicked {count} times" text(if count > 9: "That's a lot!" else: "") } } ``` The compiler emits static HTML, numeric binding IDs, an event table, and: ```text count write → dirty(binding 1, binding 2) microtask → setText(1); setText(2) ``` ### Resumption and Scheduling Islands load on an explicit policy and restore serialized state without replaying component initialization. ```velo @resume(on: visible) island ProductCard(product: view<Product>) { task add() -> Result<void, NetErr> { await post("/cart", product.id) } view { h2 product.name button(@click: add()) "Add" } } ``` Tasks use structured concurrency. CPU-bound `worker task` values must be `Send`; cancellation propagates when an island is removed.…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v0.9)** ### Execution Model - AOT compilation to optimized WASM; generated tree-shaken JS host for DOM/Web APIs - Compile-time reactive graph; state changes update only dependent bindings - Static HTML plus resumable interactive islands; no virtual DOM or full-tree hydration - Deterministic ownership: `own<T>`, borrowed `view<T>`, explicit `shared<T>` - Typed `Result<T,E>` and `T | None`; no implicit exceptions or nulls ### Toolchain and Developer Experience A language without ergonomic tooling does not get adopted. VeloScript ships with: - **`velo build`** — AOT compile with dead-code elimination; emits WASM + host adapter + static HTML - **`velo serve`** — dev server with sub-100ms incremental rebuilds and HMR preserving live state - **`velo check`** — standalone type checker and linter; runs in under 200ms on large projects - **`velo lsp`** — Language Server Protocol implementation for editor completion, type hints, and binding graph visualization ### Standard Library Surface ```velo import std.http // get<T>, post, stream import std.dom // DomRef, DomEvent types import std.fmt // format strings, number/date formatting import std.store // cross-island shared reactive state ``` `std.store` provides typed cross-island state without external dependency: ```velo store cart: Cart = { items: [], total: 0.0 } island CartIcon { view { text "({cart.items.len})" } } ``` **Efficiency Targets** - Cold start: < 5ms | Runtime: < 8KB | Hydration: O(interactive nodes) - Incremental rebuild: < 100ms | Type check: < 200ms on large projects *Next: security model and CSP integration.*

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.0)** ### Execution Model - AOT compilation to optimized WASM; generated tree-shaken JS host for DOM/Web APIs - Compile-time reactive graph; state changes update only dependent bindings - Static HTML plus resumable interactive islands; no virtual DOM or full-tree hydration - Deterministic ownership: `own<T>`, borrowed `view<T>`, explicit `shared<T>` - Typed `Result<T,E>` and `T | None`; no implicit exceptions or nulls ### Toolchain and Developer Experience - `velo build` — AOT compile with dead-code elimination; emits WASM + host adapter + static HTML - `velo serve` — dev server with sub-100ms incremental rebuilds and HMR preserving live state - `velo check` — standalone type checker and linter; runs in under 200ms on large projects - `velo lsp` — Language Server Protocol implementation for editor completion, type hints, and binding graph visualization ### Standard Library Surface ```velo import std.http // get<T>, post, stream import std.dom // DomRef, DomEvent types import std.fmt // format strings, number/date formatting import std.store // cross-island shared reactive state ``` `std.store` provides typed cross-island state without external dependency. ### Security Model & CSP Integration All generated code is CSP-compliant by construction. WASM is loaded via `script-src 'wasm-unsafe-eval'` hashes only; no inline scripts or `eval`. DOM effects are restricted to declared bindings. ```velo @policy { connect-src: self api.example.com script-src: 'self' 'wasm-unsafe-eval' } island SecureForm { task submit() -> Result<void, NetErr> { ...…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.1)** ### Execution Model - AOT compilation to optimized WASM with a tree-shaken JS host for DOM/Web APIs. - Compile-time reactive graph; state changes bypass Virtual DOM to update target bindings directly. - Resumable interactive islands on static HTML; zero full-tree hydration overhead. - Memory safety via deterministic ownership: `own<T>`, borrowed `view<T>`, and explicit `shared<T>`. - Strict typing with explicit `Result<T,E>` and `T | None` to prevent runtime exceptions. ### Toolchain and Developer Experience - `velo build` — AOT compiler producing optimized WASM, JS adapters, and static HTML. - `velo serve` — Dev server offering <100ms HMR while preserving state. - `velo check` — Quick linter and type-checker (<200ms on large codebases). - `velo lsp` — Language Server Protocol for completions and visual compile-time binding graphs. ### Standard Library & Global State ```velo import std.http // get<T>, post, stream import std.dom // DomRef, DomEvent import std.store // Cross-island shared reactive state store cart: Cart = { items: [], total: 0.0 } island CartIcon { view { text "({cart.items.len})" } } ``` ### Security Model & CSP Integration All generated WASM is CSP-compliant. Inline script elements are completely eliminated. Sanitization occurs during AOT compilation; dynamic rendering vectors are structurally locked. ```velo @policy { connect_src: ["self", "api.example.com"], script_src: ["self", "wasm-unsafe-eval"] } island SecureForm { state input: str = "" task submit() -> Result<void, NetErr> { post("/api/submit", input) catch e: return Err(e) return Ok } view { input(@input: input = target.value) button(@click: submit()) "Submit" } } ```

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.2)** ### Execution Model - AOT-compiled WASM plus a generated, tree-shaken JS host for DOM/Web APIs - Compile-time reactive graph; writes update only dependent bindings - Static HTML with resumable islands; no virtual DOM or full-tree hydration - Deterministic ownership: `own<T>`, borrowed `view<T>`, explicit `shared<T>` - Explicit `Result<T,E>` and `T | None` ### Security Model Compile-time sanitization alone cannot secure runtime data. VeloScript instead uses context-sensitive escaping and capability-checked unsafe operations: ```velo island SearchResult(data: view<Result>) { view { h2 data.title // escaped as text a(href: data.url) data.label // validated URL context } } effect preview(node: DomRef, html: TrustedHtml) { node.set_html(html) } ``` - Strings render as text by default; they cannot become HTML, URLs, CSS, or scripts implicitly - Raw markup requires `TrustedHtml`, created only by an audited sanitizer or explicit `unsafe` - Network, storage, DOM, and worker access are declared capabilities - Generated output contains no inline handlers, `eval`, or dynamically constructed code - Production builds emit CSP headers and integrity hashes; policy requirements are deployment-validated rather than assumed universally - WASM/JS dependencies are pinned in a lockfile and recorded in an SBOM ### Performance Contract Performance figures are measurable budgets, not guaranteed comparisons: | Metric | Target | Test condition | |---|---:|---| | Initial runtime payload | ≤8 KB gzip | counter island, excluding WASM engine | | Resume latency | ≤5 ms p50 | warm desktop, 100 bindings | | Update work | O(changed bindings) | no tree traversal | | Idle JS execution | 0 ms | static…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.3)** ### Execution Model - AOT-compiled WASM plus generated, tree-shaken JS host for DOM/Web APIs - Compile-time reactive graph; writes update only dependent bindings - Static HTML with resumable islands; no virtual DOM or full-tree hydration - Deterministic ownership: `own<T>`, borrowed `view<T>`, explicit `shared<T>` - Explicit `Result<T,E>` and `T | None` ### Security Model Strings render as text by default; raw markup requires `TrustedHtml`. Network, storage, DOM, and worker access are declared capabilities. No inline handlers, `eval`, or dynamic code generation. WASM/JS dependencies pinned in lockfile and recorded in SBOM. ### Performance Contract | Metric | Target | Test Condition | |---|---:|---| | Initial runtime payload | ≤8 KB gzip | counter island, excluding WASM engine | | Resume latency | ≤5 ms p50 | warm desktop, 100 bindings | | Update work | O(changed bindings) | no tree traversal | | Idle JS execution | 0 ms | static pages | ### Accessibility Model Accessibility is enforced at compile time, not audited after deployment: ```velo island ImageCard(src: str, alt: str) { view { img(src: src, alt: alt) // alt required by type button(@click: share()) "Share" // implicit role=button, focusable } } ``` - Interactive elements emit correct ARIA roles by default - Missing `alt`, unlabeled inputs, and empty buttons are **compile errors** - Focus order follows document binding order unless explicitly overridden with `@focus-order` - `velo check --a11y` reports WCAG 2.2 AA violations statically *Next: package ecosystem and versioning model.*

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.4)** ### Execution Model - AOT-compiled WASM plus generated, tree-shaken JS host for DOM/Web APIs - Compile-time reactive graph; writes update only dependent bindings - Static HTML with resumable islands; no virtual DOM or full-tree hydration - Deterministic ownership: `own<T>`, borrowed `view<T>`, explicit `shared<T>` - Explicit `Result<T,E>` and `T | None` ### Security Model Strings render as text by default; raw markup requires `TrustedHtml`. Network, storage, DOM, and worker access are declared capabilities. No inline handlers, `eval`, or dynamic code generation. WASM/JS dependencies pinned in lockfile and recorded in SBOM. ### Performance Contract | Metric | Target | Test Condition | |---|---:|---| | Initial runtime payload | ≤8 KB gzip | counter island, excluding WASM engine | | Resume latency | ≤5 ms p50 | warm desktop, 100 bindings | | Update work | O(changed bindings) | no tree traversal | | Idle JS execution | 0 ms | static pages | ### Accessibility Model Interactive elements emit correct ARIA roles by default. Missing `alt`, unlabeled inputs, and empty buttons are compile errors. Focus order follows binding order unless overridden with `@focus-order`. `velo check --a11y` reports WCAG 2.2 AA violations statically. ### Package Ecosystem and Versioning Packages publish to a central registry with enforced semantic versioning.…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.5)** ### Execution & Security - AOT-compiled WASM with a tree-shaken JS host adapter. - Compile-time reactive graph; zero Virtual DOM overhead. - Resumable islands on static HTML; zero full-tree hydration. - Deterministic ownership (`own<T>`, `view<T>`) and explicit capability checks. - Default text-escaping with `TrustedHtml` for raw injection. ### Performance & Accessibility - **Baseline:** ≤8 KB gzip runtime. - **Update Latency:** $O(\text{changed bindings})$; 0 ms idle JS execution. - **Built-in A11y:** Missing `alt` tags, unlabeled inputs, or empty buttons trigger compile-time errors. ### Package Ecosystem & Versioning The Velo Package Manager (`vp`) integrates directly with the compiler to enforce security, deterministic builds, and seamless WASM-to-WASM composition. ```toml # velo.toml [package] name = "ui-kit" version = "1.2.0" compat = ">=0.9.0" [dependencies] http = "std" canvas = "github:velo-org/canvas@2.1.0" ``` - **Enforced SemVer:** The registry rejects updates containing breaking API changes unless the major version is incremented, validated via static public API diffing during publishing. - **WASM Linker:** External Velo dependencies compile into independent WASM components that link at the engine boundary, avoiding duplicate runtime helpers. - **Secure Sandboxing:** Imported packages must declare required capabilities (e.g., `cap: network`, `cap: local_storage`) in `velo.toml`. The compiler rejects unauthorized API access at build time. - **Lockfile & SBOM:** Every build automatically generates a cryptographically signed Software Bill of Materials (SBOM) mapped to the lockfile.

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.6)** ### Adaptive Execution WASM is not universally fastest for small or DOM-heavy interactions. VeloScript therefore selects a backend per island using compile-time cost analysis: - **Static HTML:** no client code - **Tiny DOM islands:** optimized ES modules, avoiding WASM startup cost - **Compute-heavy islands:** AOT-compiled WASM - **Worker tasks:** WASM workers when transfer cost is justified - **DOM access:** generated, tree-shaken host calls because WASM cannot directly manipulate the DOM ```velo @backend(auto) island Filter(items: view<Item>) { state query: str = "" derived shown = items.filter(i => i.name.contains(query)) view { input(label: "Filter", @input: query = target.value) for item in shown keyed item.id { p item.name } } } ``` The compiler reports its decision: ```text Filter → JS (3.1 KB smaller; DOM-bound) searchIndex → WASM worker (estimated 4.7× compute gain) ``` Developers may override with `@backend(js|wasm)`; CI can reject regressions against a declared budget. ### Safety and Packages Strings are context-escaped; raw markup requires `TrustedHtml`. Packages declare network, storage, DOM, and worker capabilities. Builds use a lockfile, integrity hashes, and an SBOM.…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.7)** ### Adaptive Execution Compiler selects backend per island via cost analysis: static HTML, optimized ES modules, AOT WASM, or WASM workers. Developers may override with `@backend(js|wasm)`; CI can enforce budget constraints. ### Testing Model A language without a first-class test story forces developers to reach for external tools that may not understand VeloScript's reactive and ownership semantics. ```velo import std.test test "Counter increments on click" { island = mount(Counter) island.click(binding: 0) assert island.state.count == 1 assert island.text(binding: 1) == "Clicked 1 times" } test "fetchUser returns Err on network failure" { http.mock("/api/user", status: 500) result = fetchUser() assert result is Err } ``` - `mount()` renders an island into a headless WASM environment; no browser required - Reactive bindings settle synchronously in test scope; no `await` needed for state updates - `http.mock()` is built into `std.test`; no third-party intercept library required - Ownership violations and capability leaks are caught at test compile time, not at runtime - `velo test --coverage` emits binding-level coverage, not just line coverage ### Updated Toolchain Summary | Command | Purpose | |---|---| | `velo build` | AOT compile; WASM + JS adapter + static HTML | | `velo serve` | Dev server; <100ms HMR, live state preserved | | `velo check` | Type check + lint + a11y; <200ms | | `velo test` | Headless island tests with built-in mocking | | `velo lsp` | Editor integration with binding graph visualization | *Next: deployment targets and edge-runtime support.*

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.8)** ### Adaptive Execution Compiler selects backend per island via cost analysis: static HTML, optimized ES modules, AOT WASM, or WASM workers. Override with `@backend(js|wasm)`; CI enforces budgets. ### Security & Testing Strings context-escaped; raw markup requires `TrustedHtml`. Packages declare capabilities. Builds use lockfile, hashes, SBOM. ```velo import std.test test "Counter increments" { island = mount(Counter) island.click(binding: 0) assert island.state.count == 1 } ``` - `mount()` renders headless; bindings settle synchronously - `http.mock()` built-in; ownership violations caught at compile time - `velo test --coverage` reports binding-level coverage ### Deployment Targets & Edge Runtime `velo build` emits per-target artifacts: - Browser: WASM + host JS + static HTML - Edge (Cloudflare Workers, Deno Deploy): pure WASM module with minimal host - Serverless: resumable islands as functions; state serialized via `std.store` ```velo @target(edge) island EdgeCounter { state count: i32 = 0 view { button(@click: count += 1) "{count}" } } ``` - Edge builds exclude DOM host; use KV bindings via declared capability - Cold-start target: <2 ms on supported runtimes - Version pins and SBOM ensure reproducible deploys ### Toolchain `velo build|serve|check|test|lsp` as before.

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v1.9)** ### Adaptive Execution & Security - **Multi-backend:** Compiler selects AOT WASM, JS, or static HTML based on cost analysis. - **Security:** Strings context-escaped; raw markup requires `TrustedHtml`. Packages declare sandbox capabilities. - **Accessibility:** Missing `alt` tags, unlabeled inputs, or empty buttons trigger compile errors. ### Edge-Client State Synchronization To support resumable islands, VeloScript establishes a zero-overhead, binary state synchronization protocol (`std.sync`) over WebSockets or HTTP streams, linking edge runtimes and browsers. ```velo // Shared state synchronized automatically between edge and browser @sync(channel: "cart-sync") store cart: Cart = { items: [], total: 0.0 } @target(edge) fn update_inventory(item_id: int) { // Edge-side mutations stream Delta-encoded WASM memory directly to client cart.items.push(item_id) } ``` - **Delta-encoded payloads:** Instead of JSON, VeloScript serializes state mutations to minimal binary diffs mapped to WASM offsets. - **Zero-serialization overhead:** State is read directly from WASM memory buffers on both ends. ### Toolchain & Testing Headless, synchronous testing with built-in mocking and binding-level coverage. ```velo import std.test test "Counter increments" { island = mount(Counter) island.click(binding: 0) assert island.state.count == 1 } ``` ### Performance Contract - **Cold Start:** < 5ms (Browser) | < 2ms (Edge) - **Runtime Size:** ≤8 KB gzip (base host adapter) - **Rebuilds:** < 100ms incremental, < 200ms type-check on large projects.

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v2.0)** ### Adaptive Execution The compiler selects static HTML, optimized ES modules, WASM, or WASM workers per island. Decisions appear in build reports and can be overridden with `@backend(js|wasm)`. DOM access always uses a generated host adapter. ### Typed Edge/Client Synchronization Raw WASM memory offsets are unstable across builds and cannot provide safe “zero-serialization” synchronization. VeloScript instead generates a compact, versioned binary codec from declared schemas. ```velo @sync(channel: "cart", strategy: server_authoritative) store cart: Cart = { items: [], revision: 0 } @target(edge) action add(item: Item, expected: u64) -> Result<CartDelta, Conflict> { require auth.user require expected == cart.revision cart.items.push(item) cart.revision += 1 return delta(cart) } ``` Protocol rules: - Field IDs remain stable across compatible schema revisions - Messages include schema version, store revision, action ID, and integrity limits - Only generated deltas are accepted; clients cannot write arbitrary memory - Server-authoritative, last-write-wins, and CRDT strategies are explicit - Reconnect resumes from the last acknowledged revision or requests a snapshot - Authentication and authorization are server capabilities, never trusted client state - Payload size, nesting, and update-rate limits prevent resource exhaustion ### Performance Contract | Metric | Budget | |---|---:| | Base host adapter | ≤8 KB gzip | | Static-page idle execution | 0 ms | | Reactive update | O(changed bindings) | | Resume latency | ≤5 ms p50 under published fixture | `velo bench` records browser, hardware, cache state, payload, and percentile distributions.…

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v2.1)** ### Adaptive Execution Compiler selects static HTML, ES modules, WASM, or WASM workers per island. Override with `@backend(js|wasm)`; DOM access uses a generated host adapter. ### Typed Edge/Client Synchronization Schema-versioned binary codec with stable field IDs. Server-authoritative, last-write-wins, and CRDT strategies declared explicitly. Auth and authorization are server capabilities only. ### Error Boundaries and Observability Production failures need structured recovery, not unhandled exceptions propagating to the browser console. ```velo island ProductList { @error_boundary(fallback: ErrorCard) view { for product in products keyed product.id { ProductCard(product) } } } island ErrorCard(err: AppError) { view { p "Failed to load. " button(@click: retry()) "Retry" } } ``` - `@error_boundary` catches `Result::Err` and rendering panics within its subtree; sibling islands are unaffected - Errors propagate to `std.telemetry` automatically; no manual catch-and-report boilerplate ```velo import std.telemetry telemetry config { endpoint: "https://ingest.example.com/v1" sample_rate: 0.1 include: [errors, slow_bindings(threshold_ms: 50)] } ``` - Slow binding updates flagged above threshold emit structured traces - All telemetry payloads are capability-gated; no data leaves without declared `cap: telemetry` - `velo serve` streams telemetry locally during development; no external service required ### Performance Contract | Metric | Budget | |---|---:| | Base host adapter | ≤8 KB gzip | | Static-page idle execution | 0 ms | | Reactive update | O(changed bindings) | | Resume latency | ≤5 ms p50 |

WORKING ARTIFACT **VeloScript — Web-Native Language Specification (v2.2)** ### Adaptive Execution Compiler selects static HTML, ES modules, WASM, or WASM workers per island. Override with `@backend(js|wasm)`; DOM access uses generated host adapter. ### Typed Edge/Client Synchronization Schema-versioned binary codec with stable field IDs. Server-authoritative, last-write-wins, and CRDT strategies declared explicitly. Auth and authorization are server capabilities only. ### Error Boundaries and Observability ```velo island ProductList { @error_boundary(fallback: ErrorCard) view { for product in products keyed product.id { ProductCard(product) } } } island ErrorCard(err: AppError) { view { p "Failed to load. " button(@click: retry()) "Retry" } } ``` `@error_boundary` catches `Result::Err` and panics; unaffected siblings continue. Errors route to `std.telemetry` automatically. ```velo import std.telemetry telemetry config { endpoint: "https://ingest.example.com/v1" sample_rate: 0.1 include: [errors, slow_bindings(threshold_ms: 50)] } ``` Payloads are capability-gated. `velo serve` streams local traces. ### Performance Contract | Metric | Budget | |---|---:| | Base host adapter | ≤8 KB gzip | | Static-page idle execution | 0 ms | | Reactive update | O(changed bindings) | | Resume latency | ≤5 ms p50 |

COMPLETION REVIEW 1. **Required elements delivered:** Full execution model, adaptive backends, typed edge sync, accessibility, testing, observability, and performance contracts. 2. **Missing elements:** Web applications require styled interfaces. There is currently no specification for how VeloScript handles CSS, component-level styling, or asset optimization. 3. **Contradictions:** None. 4. **Exact corrections:** Add a first-class, zero-runtime styling pipeline specification (`style` blocks) that compiles to static, optimized CSS. *** **VeloScript — Web-Native Language Specification (v2.3)** ### Execution & Performance - **Adaptive Execution:** AOT compile-time selection of static HTML, ES modules, WASM, or workers. - **State Synchronization:** Versioned, binary codec with delta-encoded updates over `std.sync`. - **Error Boundaries:** Subtree panic isolation with capability-gated `std.telemetry`. ### Zero-Runtime Styling & Asset Pipeline To prevent runtime CSS injection costs and cumulative layout shifts, VeloScript integrates styles directly into the compiler, emitting static, heavily optimized stylesheets. ```velo island StyledButton { style { button { background: var(--primary); color: white; transition: opacity 0.2s; &:hover { opacity: 0.9; } } } view { button "Click Me" } } ``` - **Compile-Time Extraction:** All `style` blocks are extracted at build time into a single, content-hashed CSS file. - **Strict Scope Isolation:** Selectors are automatically scoped to their island using compiler-generated class attributes, preventing style leaks without Shadow DOM performance overhead. - **Critical CSS Inlining:** During server-side rendering (SSR), the compiler automatically identifies and inlines critical…

FINAL DELIVERABLE # VeloScript — Web-Native Language Specification v2.3 VeloScript is a performance-oriented language for secure, accessible websites. Performance is demonstrated through reproducible benchmarks—not universal “fastest” claims. ## Core Model - Compiler chooses static HTML, tree-shaken ES modules, AOT WASM, or WASM workers per island. - Compile-time reactive graphs update only changed bindings; no virtual DOM. - Resumable islands avoid full-page hydration. - Deterministic ownership: `own<T>`, `view<T>`, `shared<T>`. - Explicit `Result<T,E>` and `T | None`. - DOM access uses generated host adapters. ```velo @backend(auto) island Counter { state count: i32 = 0 style { button { background: var(--primary); color: white; &:hover { opacity: .9; } } } view { button(@click: count += 1) "Clicked {count} times" } } ``` ## Styling and Assets `style` blocks compile into content-hashed, minified static CSS with island-scoped selectors and dead-rule elimination—no runtime injection. SSR extracts route-critical CSS; CSP-safe deployments use external preload links or validated hashes/nonces. Fonts and images are fingerprinted, deduplicated, dimension-checked, and emitted with preload and responsive-source metadata where appropriate. ## Safety and Platform Strings are context-escaped; raw markup requires `TrustedHtml`. Packages declare DOM, network, storage, worker, and telemetry capabilities. Builds produce a lockfile, integrity hashes, and SBOM. Missing image alternatives, input labels, or button names are compile errors. Edge/client stores use schema-versioned binary codecs, stable field IDs, revisions, bounded payloads, and explicit server-authoritative, LWW, or CRDT conflict policies.…