#gmlewis/spin-moonbit-sdk

This is an experimental Spin SDK for the MoonBit programming language. Please expect breaking changes while still experimenting with the API.

This is based on this blog post: https://www.moonbitlang.com/blog/component-model and this GitHub example: https://github.com/moonbitlang/moonbit-docs/tree/464356567270284446244cccecd101c04e9806f8/examples/wasi-http

#Templates

If you wish to install MoonBit templates for the Spin CLI tool (v3), you can run:

spin templates install --git https://github.com/gmlewis/spin-moonbit-sdk

The templates are located in the templates folder.

#Build (SDK Development)

Before building, you must have already installed the MoonBit programming language and the Spin CLI tool. You also need version v1.236.0 or later of wasm-tools.

To install MoonBit, follow the instructions here (it is super-easy with VSCode): https://www.moonbitlang.com/download/

If you already have the Rust programming language installed, you can install wasm-tools by typing:

cargo install --locked wasm-tools

Then, to build this SDK, clone the repo, and type:

moon update
moon build

#Examples

Examples can be found at: https://github.com/gmlewis/spin-moonbit-sdk-examples

To run an example, type:

$ cd examples/hello-world
$ spin up --build

then from another terminal, hit the endpoint with curl:

$ curl -i localhost:3000/hello
HTTP/1.1 200 OK
content-type: text/plain
transfer-encoding: chunked
date: Sat, 17 Aug 2024 00:15:14 GMT

Hello, World!

Each example contains a README. Please refer to the README for additional commands and setup instructions. It might also be required to issue an update command: moon update to retrieve the latest dependencies.

#Regenerating the bindings

The WIT bindings under interface/, gen/, and ffi/ are generated, not hand-written. To regenerate them after editing anything under wit/:

$ cd wit
$ ./run-wit-bindgen.sh

That script is a thin wrapper around cmd/wit-translate, which drives wit-bindgen (installed via cargo install wit-bindgen-cli) and then reshapes its output into the layout documented inside that Go program. Note that wit-bindgen still emits the long-deprecated moon.mod.json / moon.pkg.json manifests; the wrapper lets the current moon compiler migrate those to moon.mod / moon.pkg rather than reimplementing the migration.

#Status

The code has been updated to support compiler:

$ moon version --all
moon 0.1.20260904 (94521db 2026-09-04) ~/.moon/bin/moon
moonc v0.10.12+1634b282e (2026-09-07) ~/.moon/bin/moonc
moonrun 0.1.20260904 (94521db 2026-09-04) ~/.moon/bin/moonrun


and generator:

```bash
$ wit-bindgen --version
wit-bindgen-cli 0.62.0 (c604ee01c 2026-09-10)

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