DEV: workflow node expression editor using CodeMirror

frontend/discourse/app/components/d-modal.gjs

@@ -201,7 +201,7 @@ export default class DModal extends Component {
       event.preventDefault();
     }
 
-    if (event.key === "Escape" && this.dismissable) {
+    if (event.key === "Escape" && this.dismissable && !event.defaultPrevented) {
       event.stopPropagation();
       this.closeModal(CLOSE_INITIATED_BY_ESC);
     }

frontend/discourse/app/lib/load-codemirror.js

@@ -0,0 +1,9 @@
+import { waitForPromise } from "@ember/test-waiters";
+
+export default async function loadCodemirrorEditor() {
+  return (
+    await waitForPromise(
+      import("discourse/static/codemirror/components/codemirror-editor")
+    )
+  ).default;
+}

frontend/discourse/app/static/codemirror/build-extensions.js

@@ -0,0 +1,17 @@
+import * as cmAutocomplete from "@codemirror/autocomplete";
+import * as cmLanguage from "@codemirror/language";
+import * as cmState from "@codemirror/state";
+import * as cmView from "@codemirror/view";
+import * as lezerHighlight from "@lezer/highlight";
+import { expressionUtils } from "./expression-utils";
+
+export function buildCmParams() {
+  return {
+    cmAutocomplete,
+    cmLanguage,
+    cmState,
+    cmView,
+    lezerHighlight,
+    utils: expressionUtils,
+  };
+}