ai-agent

Fable: Convert F# to JavaScript, TypeScript, Python, Rust or Dart

Name: Fable: Convert F# to JavaScript, TypeScript, Python, Rust or Dart
Author: fable-compiler

Founders can reuse existing F# code across web, mobile and backend stacks, generating clean JavaScript, TypeScript, Python, Rust or Dart. 3.2k+ GitHub stars.

From the repo · “F# to JavaScript, TypeScript, Python, Rust, Erlang and Dart Compiler”

3,151 stars332 forksF#Guide quality 8/10 · reviewed Oct 7Updated 10/21/2026100% free · open source

What it does

Fable compiles F# code into JavaScript, TypeScript, Python, Rust, Erlang, and Dart, allowing founders to use F# for multi-language support across different projects and platforms.

When to use it

•When building web applications that require both F# and JavaScript interoperability
•When creating cross-platform desktop applications using F# and targeting multiple languages
•When integrating F# with other language ecosystems, such as Python or Rust, for machine learning or data science tasks

Ready-to-paste prompt

dotnet fable --lang JavaScript --out output.js Program.fs

Heads up: Fable requires the .NET Core 3.1 or later runtime to be installed, and the F# compiler version must be compatible with the target language

Saves to your device

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

✅ Light setup

Installs with a command or two; your AI agent can do it for you.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/fable && curl -fsSL https://workflowstacks.com/api/skills/fable/claude-skill -o ~/.claude/skills/fable/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

What's inside — free to inspect

No purchase needed

Read the entire source before you build — unlike paid marketplaces that hide it behind a buy button.

top-level files

folders

434.1M

source size

MIT

license

Key files

.editorconfig

AGENTS.md

package.json

pyrightconfig.ci.json

pyrightconfig.json

README.md

File tree

.claude/

.config/

.devcontainer/

.github/

.husky/

.vscode/

lib/

src/

tests/

tests_external/

.editorconfig

.fantomasignore

.gitattributes

.gitignore

.markdownlint.json

.markdownlintignore

.npmrc

AGENTS.md

build_old.fsx

build.bat

build.sh

CLAUDE.md

fable_logo.png

Fable.sln

Use with Claude

New

Skip the builder — one click puts this in Claude, Cursor, Antigravity and more.

✅ Light setup

Installs with a command or two; your AI agent can do it for you.

Try it instantly — no install

Claude Code

mkdir -p ~/.claude/skills/fable && curl -fsSL https://workflowstacks.com/api/skills/fable/claude-skill -o ~/.claude/skills/fable/SKILL.md

Open in another AI app

Opens the app with this repo with the prompt ready to go — no copy-paste needed.

Connect the whole catalog (MCP)

claude mcp add --transport http workflowstacks https://workflowstacks.com/api/mcp

Adds a WorkflowStacks connector to Claude Code: search and load any skill here by chatting.

Quick Actions

Details

Creator

fable-compiler

Language

Do this with a working workflow

Pages we wrote and tested that put a skill like this to work — importable n8n templates, outcome guides and Claude Desktop configs.

MCP config

Fetch (URL → markdown) MCP config

Let Claude fetch a web page and read it as clean markdown.

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