export declare enum grepEnvVars {
    /**
     * Expression for filtering tests
     * Will search trough tags / test title and all suite titles for the test
     */
    'GREP' = "GREP",
    /**
     * Session number to not have conflicts with all_tests files and filtered results
     */
    'GREP_SESSION' = "GREP_SESSION",
    /**
     * Whether to fail run when no tests are found, default true
     */
    'failOnNotFound' = "GREP_failOnNotFound",
    /**
     * Add UI control to filter test (only for interactive mode), default true
     */
    'addControlToUI' = "GREP_addControlToUI",
    /**
     * Show tags in test title, default true
     */
    'showTagsInTitle' = "GREP_showTagsInTitle",
    /**
     * Show excluded tests as pending, default true
     */
    'showExcludedTests' = "GREP_showExcludedTests",
    /**
     * Whether to run tests in prefilter mode,default false
     */
    'GREP_PRE_FILTER' = "GREP_PRE_FILTER",
    /**
     * Will be used to create file with all tests
     * When not set will be determined automatically depending on spec pattern
     */
    'GREP_TESTS_FOLDER' = "GREP_TESTS_FOLDER",
    /**
     * Will be used for filename with all tests
     * Should be file name that doesn't match regular spec pattern (ex. doesn't have '*.cy.ts'/'*.test.ts' extensions)
     * Default 'all-tests.ts'
     */
    'GREP_ALL_TESTS_NAME' = "GREP_ALL_TESTS_NAME",
    /**
     * Will be used to write result when prefilter mode
     * When prefiter is false will use tests from this file to run
     * Default `${config.projectRoot}/filtered_test_paths.json`
     */
    'GREP_RESULTS_FILE' = "GREP_RESULTS_FILE",
    /**
     * Whether to delete all tests file after prefilter
     * default true
     */
    'GREP_DELETE_ALL_FILE' = "GREP_DELETE_ALL_FILE"
}
/**
 * Check value equals true or 'true'
 * @param val
 */
export declare const isTrue: (val: string | boolean) => val is true | "true";