export declare function isBlank(value: unknown): boolean;
export declare function mergeOptions(obj1: object, ...objs: unknown[]): any;
/**
 * Assign target object proeprties to source object proeprties, support property type:
 * * Plain Object
 * * Array
 * * Other
 * @deprecated 不应该产生新对象结果，应该直接修改 source 对象
 *
 * @param source
 * @param target
 * @param dpth The depth of merge
 * @returns
 */
export declare function assignDeepOmitBlank(source: object, target: object, dpth?: number): any;
export declare function omitBlank<T>(obj: T): T;
/**
 * @description
 *
 * Represents a type that a Component or other object is instances of.
 *
 * An example of a `Type` is `MyCustomComponent` class, which in JavaScript is represented by
 * the `MyCustomComponent` constructor function.
 *
 * @publicApi
 */
export declare const Type: FunctionConstructor;
export declare function isType(v: any): v is Type<any>;
/**
 * @description
 *
 * Represents an abstract class `T`, if applied to a concrete class it would stop being
 * instantiable.
 *
 * @publicApi
 */
export interface AbstractType<T> extends Function {
    prototype: T;
}
export interface Type<T> extends Function {
    new (...args: any[]): T;
}
export type Mutable<T extends {
    [x: string]: any;
}, K extends string> = {
    [P in K]: T[P];
};
/**
 * Returns a writable type version of type.
 *
 * USAGE:
 * Given:
 * ```
 * interface Person {readonly name: string}
 * ```
 *
 * We would like to get a read/write version of `Person`.
 * ```
 * const WritablePerson = Writable<Person>;
 * ```
 *
 * The result is that you can do:
 *
 * ```
 * const readonlyPerson: Person = {name: 'Marry'};
 * readonlyPerson.name = 'John'; // TypeError
 * (readonlyPerson as WritablePerson).name = 'John'; // OK
 *
 * // Error: Correctly detects that `Person` did not have `age` property.
 * (readonlyPerson as WritablePerson).age = 30;
 * ```
 */
export type Writable<T> = {
    -readonly [K in keyof T]: T[K];
};
export type DeepPartial<T> = T extends object ? {
    [P in keyof T]?: DeepPartial<T[P]>;
} : T;