// Type guards for values read from JSON, which arrive as `unknown`.
export type JsonObject = Record<string, unknown>;

// Any non-null object, arrays included: reading a missing key yields undefined.
export function isObject(value: unknown): value is JsonObject {
  return typeof value === "object" && value !== null;
}

// A plain mapping, which an array is not.
export function isMapping(value: unknown): value is JsonObject {
  return isObject(value) && !Array.isArray(value);
}