import type { AggregatedResult } from '@jest/test-result';
/**
 * Verifies that coverage is reported for all files and, if not, will return an error message
 * @param results The jest test run result
 * @param fileNamesWithMutantCoverage the file names for which coverage was reported
 */
export declare function verifyAllTestFilesHaveCoverage(results: AggregatedResult, fileNamesWithMutantCoverage: Set<string>): string | undefined;
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