import type { DeepPartial } from './util';
/**
  Function merge objects {a} and {b} by [keys]
  If key from {b} is not presented in {a} - it does nothing
  If both objects has key - result will get key from {b}
  if value is seems like object - then we run function recursive for value

  keys - which keys will be checked for objects
  a - left
  b - right
  customLogic (a[key], target[key]) : boolean -
    if it returns true - then get value from {b}, else from {a}
*/
export declare function mergeLeftKeys<T extends Record<string, any>>(keys: Array<keyof T>, source: T, target?: DeepPartial<T>, customLogic?: (key: keyof T, source: T, target: DeepPartial<T>) => boolean): T;