/**
 * Convert an arbitrary key to snake_case. Handles camelCase, PascalCase,
 * `dot.separated`, and runs of capitals (`ERA` -> `era`, `homeRBI` -> `home_rbi`).
 */
export declare function snakeCase(key: string): string;
/**
 * json_normalize equivalent: flatten an array of (possibly nested) row objects
 * into rectangular rows with deep `_`-joined, snake_cased keys. Array-valued
 * cells are stringified. Non-array / empty input returns `[]`.
 */
export declare function normalize(rows: any[]): Record<string, any>[];
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