export function isExpressionField(field: any): boolean;
export function isAggregateField(field: any): boolean;
export function isValidField(field: any): boolean;
/**
 * Get the target field ID (recursively) from a Field clause. For Field clauses that use string Field names, this
 * returns the Field clause directly. FIXME !!!
 */
export function getFieldTargetId(field: any): any;
export function hasSourceField(fieldClause: any): any;
