Choose an SDK · FluentCI Docs

Use one plugin runtime with language-specific composition, type checking, and error handling.

One runtime, different source languages

A source module is compiled to Wasm before the CLI invokes its jobs. Choose a language for its composition and tooling model; the guest runtime still calls host commands through the engine. SDK coverage and exact API names differ.

SDK	Selector	Composition	Default source entry
ClojureScript	`clojurescript`	Immutable tagged maps, `->`, checked `.cljc`	`src/main/plugin.cljc`
PureScript	`purescript`	Typed functions, `#`, `Either`	`src/Main.purs`
Rust	`rust`	Rust functions and Extism PDK exports	`src/lib.rs`
TypeScript	`typescript`	Fluent builders and argv arrays	`entry.ts`
Python	`python`	Decorated exports and chained builders	`plugin.py`
Gleam	`gleam`	`	>`and`Result`
Elixir	`elixir`	`defplugin` DSL and `	>`
ReScript	`rescript`	Typed builders, `->`, `result`	`src/Greeting.res`

Scaffold a module

fluentci init --sdk clojurescript
fluentci modules add checks --sdk purescript

init creates a workspace configuration and starter module. modules add extends an existing workspace. init --standalone --sdk SDK creates a reusable package in the current directory instead. Existing files are preserved.

Build and run

fluentci run main hello
fluentci modules main --json

The CLI selects the module's SDK build pipeline and verifies its artifact. Source builds need compiler tools even during discovery. An existing .wasm module can be run without rebuilding that source, but its host commands still need their dependencies.

JavaScript-targeting SDKs use esbuild and extism-js to package exports. Python uses its Extism Python build path. Elixir generates a Rust/Wasm plugin rather than embedding a BEAM VM. Rust builds a cdylib for the Wasm target in release mode.

Keep export layers aligned

When adding a job, update the language export and any JavaScript or interface wrapper used by that starter. An ordinary helper function is not necessarily a Wasm export. Check fluentci modules MODULE --json after rebuilding.

Each guide below shows a pipeline sample and the corresponding starter's build requirements. Some starters initially print only a greeting; replace their source with the sample when following a guide.