type ValueTransform = (value: unknown) => unknown;
export interface FieldNormalizer {
    /** Explicit `python_snake_case` → `tsCamelCase` overrides. */
    rename?: Record<string, string>;
    /** Optional per-source-key value transforms (run before rename). */
    transform?: Record<string, ValueTransform>;
    /** Source keys to drop silently (e.g. unsupported fields). */
    drop?: readonly string[];
}
/**
 * Python states a timeout in seconds where TypeScript uses milliseconds, so
 * the S3 family and the Hub configs rename `timeout` to `timeoutMs` and
 * convert through this. A non-number passes untouched for the schema to
 * refuse, rather than being multiplied into a different wrong number.
 */
export declare function secondsToMs(value: unknown): unknown;
export declare function snakeToCamel(snake: string): string;
/**
 * Translate a Python-style snake_case config blob to a TS camelCase one.
 *
 * Lookup order for each input key:
 *   1. `drop` — silently skipped.
 *   2. `rename` — used as the output key.
 *   3. Default — `snakeToCamel(key)`. Already-camelCase keys round-trip unchanged.
 *
 * Values pass through untouched unless `transform[key]` is set.
 */
export declare function normalizeFields(input: Record<string, unknown>, spec?: FieldNormalizer): Record<string, unknown>;
export {};
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