feat(core): add Electron runtime, services, and app composition

src/main/runtime/field-grouping-resolver.ts

@@ -0,0 +1,29 @@
+import type { KikuFieldGroupingChoice } from '../../types';
+
+type FieldGroupingResolver = ((choice: KikuFieldGroupingChoice) => void) | null;
+
+export function createGetFieldGroupingResolverHandler(deps: {
+  getResolver: () => FieldGroupingResolver;
+}) {
+  return (): FieldGroupingResolver => deps.getResolver();
+}
+
+export function createSetFieldGroupingResolverHandler(deps: {
+  setResolver: (resolver: FieldGroupingResolver) => void;
+  nextSequence: () => number;
+  getSequence: () => number;
+}) {
+  return (resolver: FieldGroupingResolver): void => {
+    if (!resolver) {
+      deps.setResolver(null);
+      return;
+    }
+
+    const sequence = deps.nextSequence();
+    const wrappedResolver = (choice: KikuFieldGroupingChoice): void => {
+      if (sequence !== deps.getSequence()) return;
+      resolver(choice);
+    };
+    deps.setResolver(wrappedResolver);
+  };
+}