import { AppNameStrategyType, type Changes, type PropertyMetadata, type RawValues } from './types';
export declare enum SetResult {
    CREATED = 0,
    UPDATED = 1,
    UNCHANGED = 2
}
export declare class Vars {
    private readonly prefix;
    private readonly appNameStrategyType?;
    private readonly values;
    private readonly appNameStrategies;
    /**
     * We don't use class as context here because it is undefined if
     * tsc target is ES2022
     */
    private readonly logger;
    /**
     * Expecting prefix is already converted to upper snake case
     * @param prefix
     */
    constructor(prefix: string, appNameStrategyType?: AppNameStrategyType | undefined);
    set(key: string, value: unknown): [SetResult, string];
    merge(values: RawValues): Changes;
    extract<T>(propertyMetadata: PropertyMetadata<T>): T | undefined;
    private getEnvironmentValueWithAppNameStrategyFromConfig;
    private getEnvironmentValueWithPlatformAppNameStrategy;
}