checkPath.convert = makePosix

    // 'C:\\foo'     <- 'C:\\foo' has been converted to 'C:/'
    // 'd:\\foo'
    const REGIX_IS_WINDOWS_PATH_ABSOLUTE = /^[a-z]:\//i
    checkPath.isNotRelative = path =>
        REGIX_IS_WINDOWS_PATH_ABSOLUTE.test(path)
        || isNotRelative(path)