import z from 'zod';
export declare class EnvService<T extends z.ZodType> {
    private static instance;
    private readonly validatedEnv;
    private constructor();
    static initialize<S extends z.ZodType>(schema: S): EnvService<S>;
    static getInstance<S extends z.ZodType>(): EnvService<S>;
    getAll(): z.infer<T>;
    get<K extends keyof z.infer<T>>(key: K): z.infer<T>[K];
}
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