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# Lustre
A framework for building create web apps – powered by Gleam and React!
---
[](https://hex.pm/packages/lustre)
[](https://hexdocs.pm/lustre/)
```gleam
import gleam/int
import lustre
import lustre/element.{button, div, p, text}
import lustre/event.{on_click}
import lustre/cmd
pub fn main() {
let app = lustre.application(#(0, cmd.none()), update, render)
lustre.start(app, "#app")
}
pub type Action {
Incr
Decr
}
fn update(state, action) {
case action {
Incr -> #(state + 1, cmd.none())
Decr -> #(state - 1, cmd.none())
}
}
fn render(state) {
div(
[],
[
button([on_click(Decr)], [text("-")]),
p([], [text(int.to_string(state))]),
button([on_click(Incr)], [text("+")]),
],
)
}
```
---
❗️ This package relies on Gleam's JavaScript FFI and is intended to be run in
the browser. **It will not work if your are targetting Node.js or Erlang.**
---
## Installation
If available on Hex, this package can be added to your Gleam project:
```sh
gleam add lustre
```
and its documentation can be found at <https://hexdocs.pm/lustre>. You will also
need to install `react` and `react-dom` from npm:
```sh
npm i react react-dom
```
---
## Development
First, make sure you have both Gleam and Node.js installed, then:
```bash
npm i
npm start
```
This sets up `chokidar` to watch our gleam source code and runs the compiler
whenever we make a change. It also starts a server that will serve the examples
located in `test/example/`.
|
