Log all user settings to enable measurement of experiment impacts (#11354)

packages/core/src/utils/safeJsonStringify.ts

@@ -11,6 +11,8 @@
  * @param space - Optional space parameter for formatting (defaults to no formatting)
  * @returns JSON string with circular references replaced by [Circular]
  */
+import type { Config } from '../config/config.js';
+
 export function safeJsonStringify(
   obj: unknown,
   space?: string | number,
@@ -30,3 +32,37 @@ export function safeJsonStringify(
     space,
   );
 }
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function removeEmptyObjects(data: any): object {
+  const cleanedObject: { [key: string]: unknown } = {};
+  for (const k in data) {
+    const v = data[k];
+    if (v !== null && v !== undefined && typeof v === 'boolean') {
+      cleanedObject[k] = v;
+    }
+  }
+
+  return cleanedObject;
+}
+
+/**
+ * Safely stringifies an object to JSON, retaining only non-null, Boolean-valued members.
+ *
+ * @param obj - The object to stringify
+ * @returns JSON string with circular references skipped and only non-null, Boolean member values retained.
+ */
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export function safeJsonStringifyBooleanValuesOnly(obj: any): string {
+  let configSeen = false;
+  return JSON.stringify(removeEmptyObjects(obj), (key, value) => {
+    if ((value as Config) !== null && !configSeen) {
+      configSeen = true;
+      return value;
+    }
+    if (typeof value === 'boolean') {
+      return value;
+    }
+    return '';
+  });
+}