/**
 * Pure function - doesn't mutate either parameter!
 * Uses the default options and overrides with the options provided by the user
 * @param defaultOptions the defaults
 * @param userOptions the user opts
 * @returns the options with defaults
 */
export declare function applyDefault<TUser extends any[], TDefault extends TUser>(defaultOptions: TDefault, userOptions: TUser | null): TDefault;
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