/**
 * ## Object Decorator
 *
 * Property decorator that validates a property value is a plain object.
 * This is a fundamental object validation decorator that ensures the value
 * is actually a plain object before applying other object-specific validations.
 *
 * ### Usage
 * ```typescript
 * class UserProfile {
 *   @IsObject()
 *   metadata: Record<string, any>;
 * }
 * ```
 *
 * ### Validation Behavior
 * - **Passes**: When value is a plain object (including empty objects)
 * - **Fails**: When value is not a plain object (null, undefined, array, string, number, class instances, etc.)
 *
 * ### Error Messages
 * - Default: `"[PropertyName]: Must be an object"`
 * - I18n key: `"validator.object"`
 *
 * ### Related Decorators
 * - Often used as prerequisite for: `@ValidateNested`, `@ObjectKeys`, `@ObjectValues`, etc.
 *
 * @returns A property decorator function
 * @public
 */
export declare const IsObject: () => PropertyDecorator;
declare module '../types' {
    interface ValidatorRuleParamTypes<Context = unknown> {
        /**
         * ## Object Rule Parameters
         *
         * Validates that a value is a plain object.
         * This rule takes no parameters and checks if the input value is a plain JavaScript object.
         *
         * ### Type Definition
         * ```typescript
         * Object: [];
         * ```
         *
         * ### Usage
         * ```typescript
         * // As a decorator
         * class MyClass {
         *   @IsObject()
         *   config: Record<string, any>;
         * }
         *
         * // As a validation rule
         * const result = await Validator.validate({
         *   value: { key: 'value' },
         *   rules: ['Object']
         * });
         * ```
         *
         * ### Validation Behavior
         * - **Valid objects**: `{}`, `{key: 'value'}`, `Object.create(null)`
         * - **Invalid values**: `null`, `undefined`, `[]`, `'string'`, `42`, class instances
         *
         * ### Error Messages
         * - I18n key: `"validator.object"`
         * - Default: `"This field must be an object"`
         *
         * @public
         */
        Object: [];
    }
}