import type { OperatorDefinition } from '../../definition_types';
/**
 * Returns `true` if the value is `NULL`, `false` otherwise.
 *
 * Note: If a field is only in some documents it will be `NULL` in the documents that did not contain it.
 *
 * @example
 * FROM employees
 * | WHERE birth_date IS NULL
 */
declare const definition: OperatorDefinition;
export default definition;
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