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Installation

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With npm or yarn

Add the @appsignal/stimulus and @appsignal/javascript packages to your package.json. Then, run yarn install/npm install. You can also add these packages to your package.json on the command line: 
yarn add @appsignal/javascript @appsignal/stimulus
npm install @appsignal/javascript @appsignal/stimulus

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With JSPM.io import maps

Using the JSPM.io import map generator, you can generate an import map for your application’s dependencies. Add @appsignal/javascript and @appsignal/stimulus to the dependencies list in the generator, then add the generated import map and ES module shims to your application’s code.

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With rails-importmap

Use the following command to add these packages to your Rails application’s import maps: 
./bin/importmap pin @appsignal/javascript @appsignal/stimulus

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Usage

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Application.handleError

The default Stimulus integration is a function that binds to the Application.handleError property. In a new app created using rails new $APP_NAME --webpack=stimulus, for example, your javascript/controllers/index.js file would look something like this: 
import { Application } from "stimulus";
import { definitionsFromContext } from "stimulus/webpack-helpers";

import { appsignal } from "./appsignal";
import { installErrorHandler } from "@appsignal/stimulus";

const application = Application.start();
installErrorHandler(appsignal, application);
const context = require.context("controllers", true, /_controller\.js$/);
application.load(definitionsFromContext(context));