const Struct = { deepFieldUpdate: ( node, { input, params, path: [nextNodeKey, ...remainingPath], via: toFieldValue } ) => ({ ...node, [nextNodeKey]: remainingPath.length > 0 ? Struct.deepFieldUpdate( Struct.typeMatch(node[nextNodeKey]) || Array.isArray(node[nextNodeKey]) ? node[nextNodeKey] : { ...((node[nextNodeKey] ?? null) !== null ? { __archivedLeaf__: node[nextNodeKey] } : {}), }, { input, path: remainingPath, via: toFieldValue } ) : toFieldValue({ input, lastKnownValue: node[nextNodeKey], params, }), }), isEqual: (input1, input2) => Struct.typeMatch(input1) && Struct.typeMatch(input2) ? JSON.stringify(Struct.toOrdered(input1)) === JSON.stringify(Struct.toOrdered(input2)) : false, toOrdered: (input) => Object.keys(input) .sort() .reduce((output, key) => ({ ...output, [key]: input[key] }), {}), pick: (object, subsetKeys) => Object.fromEntries( Object.entries(object ?? {}).filter(([key, _]) => subsetKeys.includes(key) ) ), typeMatch: (input) => input !== null && typeof input === "object" && !Array.isArray(input), }; return { Struct };