Add flashes with StumulusJS

app/javascript/controllers/application.js

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+import { Application } from "@hotwired/stimulus"
+
+const application = Application.start()
+
+// Configure Stimulus development experience
+application.debug = false
+window.Stimulus   = application
+
+export { application }

app/javascript/controllers/index.js

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+import { application } from "controllers/application"
+
+// Eager load all controllers defined in the import map under controllers/**/*_controller
+import { eagerLoadControllersFrom } from "@hotwired/stimulus-loading"
+eagerLoadControllersFrom("controllers", application)

app/javascript/controllers/removals_controller.js

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+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  remove() {
+    this.element.remove()
+  }
+}