import type { StringRecord } from '@appium/types';
/**
 * Creates a shallow object where undefined keys from `target` are filled
 * from `defaultsObj`.
 *
 * @param target - The object with priority values.
 * @param defaultsObj - The object providing fallback values.
 * @returns A new object containing merged defaulted values.
 */
export declare function defaults<T extends Record<string, any>, U extends Record<string, any>>(target: T, defaultsObj: U): T & U;
/**
 * Performs deep strict equality comparison.
 *
 * @param a - First value.
 * @param b - Second value.
 * @returns True when both values are deeply equal.
 */
export declare function deepEqual(a: unknown, b: unknown): boolean;
/**
 * Validates that all parameters in the provided object have non-nil values.
 * Throws an error if any parameters are missing (null or undefined).
 *
 * @template T - The type of the parameters object.
 * @param params - An object containing parameters to validate.
 * @returns The same parameters object if all values are valid.
 * @throws Error if any parameters are missing, listing all missing parameter names.
 */
export declare function checkParams<T extends StringRecord>(params: T): T;
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