import type { RawValues, SourceType } from '../../types';
export declare abstract class ConfigSource {
    /**
     * Wrapped .loadRaw() method which should be implemented in
     * derived class and enforces basic validation and error transforming.
     *
     * NOTE: Guarantees that only ConfigSourceException can't be thrown
     * @returns Promise<Vars>
     */
    load(): Promise<RawValues>;
    /**
     * Flattens raw configuration and validates that each property is
     * either primitive or array of primitives.
     *
     * @param obj Raw configuration object obtained from source
     * @param prefix recursive calls chain path in for of string
     * @returns Vars
     */
    private flattenEndValidate;
    abstract name(): string;
    abstract type(): SourceType;
    abstract loadRaw(): Promise<unknown>;
}