import type { TEnvPreprocess } from './types';
/** Chains preprocess functions in order. Returns undefined early if any step returns undefined. */
export declare function pipePreprocess<GValue>(firstPreprocess: TEnvPreprocess<GValue>, ...preprocesses: TEnvPreprocess<GValue>[]): TEnvPreprocess<GValue>;
/** Treats blank strings and nullish values as undefined. Throws for non-string, non-nullish values. */
export declare function emptyStringAsUndefined(value: unknown): string | undefined;
/** Removes one trailing slash from string values. Throws for non-string, non-nullish values. */
export declare function stripTrailingSlash(value: unknown): string | undefined;
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