Initial commit

Author: W4G1

.github/workflows/deno.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+# This workflow will install Deno then run `deno lint` and `deno test`.
+# For more information see: https://github.com/denoland/setup-deno
+
+name: Deno
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Setup repo
+        uses: actions/checkout@v5
+
+      - name: Setup Deno
+        uses: denoland/setup-deno@v2
+        with:
+          deno-version: v2.5.x
+
+      # - name: Verify formatting
+      #   run: deno fmt --check
+
+      # - name: Run linter
+      #   run: deno lint
+
+      - name: Run tests
+        run: deno task test

.gitignore

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+node_modules/
+dist/
+.workers/

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+waltervdgiessen@gmail.com.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at
+https://www.contributor-covenant.org/translations.

LICENSE.md

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+MIT License
+
+Copyright (c) 2026 Walter van der Giessen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+<div align="center">
+
+  <h1>experimental-threads</h1>
+
+  <p>
+    <strong>JIT-compiled multithreading using lexical scope analysis and shared memory rehydration.</strong>
+  </p>
+
+  [![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+  [![Status](https://img.shields.io/badge/status-experimental-orange.svg)]()
+  [![TypeScript](https://img.shields.io/badge/language-TypeScript-3178C6.svg)]()
+
+</div>
+
+<br />
+
+**experimental-threads** is a highly experimental concurrency library for server-side JavaScript that bridges the gap between the single-threaded Event Loop and true parallelism. It introduces a novel runtime architecture that combines **Abstract Syntax Tree (AST) analysis**, **source-code injection**, and **deterministic memory hydration** to emulate the ergonomics of Go routines or Rust threads.
+
+Unlike traditional Web Workers which require separate entry files and manual message passing, this library allows for the execution of **lexical closures** in isolated threads. It automatically handles the serialization of captured variables and ensures referential integrity of shared memory resources (`SharedArrayBuffer`) across execution contexts.
+
+## Installation
+
+```bash
+npm install experimental-threads
+```
+
+## Architecture
+
+### 1. Runtime Scope Analysis & AST Traversal
+
+Standard JavaScript closures cannot be serialized to Workers because they are bound to the parent execution context. **experimental-threads** bypasses this limitation by performing **Just-In-Time (JIT) Static Analysis** on the calling code.
+
+When `spawn(fn)` is invoked:
+
+1. **Call Site Resolution:** The library inspects the V8 stack trace to identify the exact file, line, and column of the invocation.
+2. **AST Generation:** It reads the source file from the disk and feeds it into the **TypeScript Compiler API** to generate a synthetic AST.
+3. **Symbol Resolution:** It traverses the AST to locate the specific arrow function expression passed to `spawn`.
+4. **Identifier Resolution:** It walks the scope chain of the function body, distinguishing between *bound identifiers* (parameters, local variables) and *free variables* (captured from the outer scope).
+5. **Transpilation:** It generates a standalone worker entry script that imports necessary modules and injects the captured free variables as structured-cloned properties.
+
+### 2. Deterministic Memory Hydration (`Global<T>`)
+
+In a multi-process or multi-isolate architecture (like Web Workers), module singletons are not shared. They are instantiated once per thread. This breaks the identity of shared locks or buffers.
+
+This library introduces **Location-Dependent Reference Integrity**.
+
+* **Identity Generation:** Every `Global` instance is assigned a deterministic ID based on its definition site.
+* **Memory Registry:** The main thread maintains a global memory registry, mapping these IDs to their underlying `SharedArrayBuffer` pointers.
+* **Hydration:** When a Worker boots and imports a module containing a `Global`, the constructor intercepts the instantiation. Instead of allocating new memory, it queries the registry transmitted during the handshake phase and **hydrates** the instance with the existing buffer from the main/parent thread.
+
+This guarantees that `const lock = new Global(new Mutex())` refers to the exact same memory address (access cost) in every thread, enabling atomic synchronization.
+
+## Usage
+
+```typescript
+import { spawn } from "experimental-threads";
+
+const data = { hello: 'world' };
+
+const result = await eval(spawn(async () => {
+   // Will be automatically captured
+  console.log(data.hello); // "world"
+
+  return Math.random();
+}));
+
+console.log(result); // 0.6378467071314606
+```
+
+## Synchronization Primitives
+
+### `Mutex`
+
+A mutual exclusion primitive preventing race conditions. Uses a futex-like mechanism with `Atomics.wait` and `Atomics.notify`. Supports the `using` keyword (Explicit Resource Management) for RAII-style scope-based unlocking.
+
+### `Semaphore`
+
+A signaling mechanism to control access to a common resource by multiple processes. Supports the `using` keyword (Explicit Resource Management).
+
+---
+
+## License
+
+MIT

SECURITY.md

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+# Reporting a Vulnerability
+
+To report a vulnerability, please open a private vulnerability report at https://github.com/W4G1/experimental-threads/security.

deno.jsonc

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+{
+  "tasks": {
+    "dev": "deno run -A --watch ./main.ts",
+    "update": "deno outdated --update --latest",
+    "build": "deno run -A scripts/build.ts",
+    "test": "deno test -A --v8-flags=\"--expose-gc\"",
+    "bench": "deno bench -A --no-check --cached-only",
+  },
+  "imports": {
+    "@std/assert": "jsr:@std/assert@^1.0.18",
+    "@std/async": "jsr:@std/async@^1.1.1",
+    "@std/fs": "jsr:@std/fs@^1.0.22",
+    "@std/path": "jsr:@std/path@^1.1.4",
+    "typescript": "npm:typescript@^5.9.3",
+    "experimental-threads": "./src/deno/lib.ts",
+  },
+  "compilerOptions": {
+    // From @tsconfig/strictest
+    "strict": true,
+    "allowUnusedLabels": false,
+    "allowUnreachableCode": false,
+    "exactOptionalPropertyTypes": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitOverride": true,
+    "noImplicitReturns": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noUncheckedIndexedAccess": true,
+    // "noUnusedLocals": true,
+    // "noUnusedParameters": true,
+    "checkJs": true,
+    "lib": ["deno.window", "deno.worker" /*, "deno.unstable"*/],
+  },
+  "lint": {
+    "rules": {
+      "include": [],
+      "exclude": ["no-explicit-any", "no-unused-vars"],
+    },
+  },
+  // "unstable": ["raw-imports", "worker-options", "cron"]
+}