/**
 * The operator of a where filter.
 */
export declare type WhereFilterOp = "==" | "!=" | "<" | "<=" | ">" | ">=" | "array-contains" | "array-contains-any" | "in" | "not-in";
/**
 * Determines the where-filter to be applied.
 */
export declare type WhereClause = [string, WhereFilterOp, any];
/**
 * Sort by the specified field, optionally in descending order instead of ascending.
 */
export declare type OrderByClause = [string, ("asc" | "desc")?];
/**
 * The maximum number of items to return.
 */
export declare type Limit = number;