diff --git a/helpers.inc.php b/helpers.inc.php
index 81c188a..1153e64 100644
--- a/helpers.inc.php
+++ b/helpers.inc.php
@@ -2,43 +2,43 @@
 namespace taskman;
 use Exception;
 
-function is_release()
+function is_release() : bool
 {
   return get("GAME_IS_DEV") == 0;
 }
 
-function is_dev()
+function is_dev() : bool
 {
   return !is_release();
 }
 
-function is_dev_no_env()
+function is_dev_no_env() : bool
 {
   return is_dev() && !getenv("GAME_ENV");
 }
 
-function is_win()
+function is_win() : bool
 {
   return !(DIRECTORY_SEPARATOR == '/');
 }
 
-function is_linux()
+function is_linux() : bool
 {
   return PHP_OS == 'Linux';
 }
 
-function stderr($msg)
+function stderr(string $msg)
 {
   fwrite(STDERR, $msg);
 }
 
-function fatal($msg)
+function fatal(string $msg)
 {
   fwrite(STDERR, $msg);
   exit(1);
 }
 
-function make_tmp_file_name($file_name)
+function make_tmp_file_name(string $file_name) : string
 {
   $meta = stream_get_meta_data(tmpfile());
   $tmp_dir = dirname($meta['uri']);
@@ -46,7 +46,7 @@ function make_tmp_file_name($file_name)
   return $tmp_file;
 }
 
-function get_tmp_build_path($file)
+function get_tmp_build_path(string $file) : string
 {
   global $GAME_ROOT;
 
@@ -55,7 +55,7 @@ function get_tmp_build_path($file)
   return normalize_path("$GAME_ROOT/build/tmp/$name");
 }
 
-function find_recursive($dir, $ext)
+function find_recursive(string $dir, string $ext) : array
 {
   if(is_win())
     $cmd = "dir /s /b " . normalize_path("$dir/*$ext");
@@ -65,7 +65,7 @@ function find_recursive($dir, $ext)
   return $out;
 }
 
-function find_files($dir, array $fnmatch_patterns = array())
+function find_files(string $dir, array $fnmatch_patterns = []) : array
 {
   $results = array();
   $files = scandir($dir);
@@ -89,7 +89,7 @@ function find_files($dir, array $fnmatch_patterns = array())
 
 
 //obsolete, use find_files instead
-function scan_files_rec(array $dirs, array $only_extensions = array(), $mode = 1)
+function scan_files_rec(array $dirs, array $only_extensions = [], int $mode = 1) : array
 {
   $files = array();
   foreach($dirs as $dir)
@@ -124,7 +124,7 @@ function scan_files_rec(array $dirs, array $only_extensions = array(), $mode = 1
   return $files;
 }
 
-function normalize_path($path, $unix=null/*null means try to guess*/)
+function normalize_path(string $path, ?bool $unix = null/*null means try to guess*/) : string 
 {
   if(is_null($unix)) 
     $unix = !is_win();
@@ -147,7 +147,7 @@ function normalize_path($path, $unix=null/*null means try to guess*/)
   return $res;
 }
 
-function normalize_sed_path($path)
+function normalize_sed_path(string $path) : string
 {
   $path = normalize_path($path);
   if(is_win())
@@ -157,18 +157,18 @@ function normalize_sed_path($path)
 
 //NOTE: Escaping multibyte unicode chars as \uXXXX impacts decoding performance drastically
 //so we unescape them while encoding json
-function json_encode_unescaped($arr)
+function json_encode_unescaped(array $arr) : string
 {
   array_walk_recursive($arr, function (&$item, $key) { if (is_string($item)) $item = mb_encode_numericentity($item, array (0x80, 0xffff, 0, 0xffff), 'UTF-8'); });
   return mb_decode_numericentity(json_encode($arr), array (0x80, 0xffff, 0, 0xffff), 'UTF-8');
 }
 
-function json_make_pretty($json)
+function json_make_pretty(string $json) : string
 {
   return prettyJSON($json);
 }
 
-function need_to_regen($file, array $deps, $debug = false)
+function need_to_regen(string $file, array $deps, bool $debug = false) : bool
 {
   if(!is_file($file))
   {
@@ -191,7 +191,7 @@ function need_to_regen($file, array $deps, $debug = false)
   return false;
 }
 
-function need_to_regen_any(array $files, array $deps, $debug = false)
+function need_to_regen_any(array $files, array $deps, bool $debug = false) : bool
 {
   $earliest_file = null;
   $earliest_time = 2e32;
@@ -218,7 +218,7 @@ function need_to_regen_any(array $files, array $deps, $debug = false)
   return need_to_regen($earliest_file, $deps, $debug);
 }
 
-function fnmatch_patterns($file, array $fnmatch_patterns)
+function fnmatch_patterns(string $file, array $fnmatch_patterns) : bool
 {
   foreach($fnmatch_patterns as $pattern)
   {
@@ -236,10 +236,8 @@ function fnmatch_patterns($file, array $fnmatch_patterns)
 //1 - force write always, 
 //2 - write only if content differs
 //3 - write only if content differs, don't even touch if they are same
-function gen_file($tpl_file, $result_file, $deps = array(), $force = 0, $perms = 0640)
+function gen_file(string $tpl_file, string $result_file, $deps = array(), $force = 0, int $perms = 0640)
 {
-  global $GAME_ROOT;
-
   $deps[] = $tpl_file;
   if($force > 0 || need_to_regen($result_file, $deps))
   {
@@ -393,14 +391,14 @@ function recurse_copy(
   closedir($dir);
 } 
 
-function shell($cmd, &$out=null)
+function shell(string $cmd, &$out = null)
 {
   shell_try($cmd, $ret, $out);
   if($ret != 0)
     throw new Exception("Shell execution error(exit code $ret)");
 }
 
-function shell_try($cmd, &$ret=null, &$out=null)
+function shell_try(string $cmd, &$ret = null, &$out = null)
 {
   msg(" shell: $cmd\n");
   msg(" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n");
@@ -411,7 +409,7 @@ function shell_try($cmd, &$ret=null, &$out=null)
     _execute_proc_cmd($cmd, $ret, $out);
 }
 
-function shell_get($cmd, $as_string = true)
+function shell_get(string $cmd, bool $as_string = true)
 {
   exec($cmd, $out, $code);
   if($code !== 0)
@@ -419,7 +417,7 @@ function shell_get($cmd, $as_string = true)
   return $as_string ? implode("", $out) : $out;
 }
 
-function _execute_proc_cmd($cmd, &$ret, &$out)
+function _execute_proc_cmd(string $cmd, &$ret, &$out)
 {
   //TODO: do we really need to redirect error stream?
   $proc = popen("$cmd 2>&1", 'r');
@@ -442,7 +440,7 @@ function _execute_proc_cmd($cmd, &$ret, &$out)
   $ret = pclose($proc);
 }
 
-function _ensure_copy_file($src, $dst, $copy_mode = COPY_MODE_BUILTIN, $mtime_check = false)
+function _ensure_copy_file(string $src, string $dst, int $copy_mode = COPY_MODE_BUILTIN, bool $mtime_check = false)
 {
   if($mtime_check && file_exists($dst) && filemtime($src) <= filemtime($dst))
     return;
@@ -467,7 +465,7 @@ function _ensure_copy_file($src, $dst, $copy_mode = COPY_MODE_BUILTIN, $mtime_ch
     throw new Exception("Unrecognized copy mode $copy_mode");
 }
 
-function ensure_identical($src, $dst, $excludes = array()) 
+function ensure_identical(string $src, string $dst, $excludes = array()) 
 {
   msg_dbg("deleting files missing in $src from $dst ...\n");
 
@@ -509,7 +507,7 @@ function ensure_identical($src, $dst, $excludes = array())
   closedir($dir);
 } 
 
-function ensure_symlink($src, $dst, $dir_perms = 0777)
+function ensure_symlink(string $src, string $dst, int $dir_perms = 0777)
 {
   if(!is_file($src) && !is_dir($src))
     throw new Exception("Bad file or dir '$src'");
@@ -525,7 +523,7 @@ function ensure_symlink($src, $dst, $dir_perms = 0777)
     throw new Exception("Could not create symlink");
 }
 
-function ensure_rm($what)
+function ensure_rm(string $what)
 {
   if(is_dir($what) && !is_link($what))
     rrmdir($what);
@@ -533,7 +531,7 @@ function ensure_rm($what)
     unlink($what);
 }
 
-function ensure_mkdir($dir, $perms = 0775)
+function ensure_mkdir(string $dir, int $perms = 0775)
 {
   if(is_dir($dir))
     return;
@@ -547,7 +545,7 @@ function ensure_mkdir($dir, $perms = 0775)
     throw new Exception("Could not chmod " . decoct($perms) . " dir '$dir'");
 }
 
-function ensure_var_dir($dir)
+function ensure_var_dir(string $dir)
 {
   ensure_mkdir($dir, 0777);
   $items = fmatch("$dir/*");
@@ -561,7 +559,7 @@ function ensure_var_dir($dir)
   }
 }
 
-function compare_files_timestamp($file_a, $file_b)
+function compare_files_timestamp(string $file_a, string $file_b) : int
 {
   $file_a_timestamp = file_exists($file_a) ? filemtime($file_a) : 0;
   $file_b_timestamp = file_exists($file_b) ? filemtime($file_b) : 0;
@@ -571,15 +569,15 @@ function compare_files_timestamp($file_a, $file_b)
     return -1;
 }
 
-function fmatch($pat)
+function fmatch(string $path) : array
 {
-  $res = glob($pat);
+  $res = glob($path);
   if(!is_array($res))
     return array();
   return $res;
 }
 
-function rrmdir($dir, $remove_top_dir = true) 
+function rrmdir(string $dir, bool $remove_top_dir = true) 
 {
   if(is_dir($dir))
   {
@@ -605,28 +603,7 @@ function rrmdir($dir, $remove_top_dir = true)
   }
 } 
 
-function run_apple_script($script)
-{
-  $vm = popen("osascript", "w");
-  fwrite($vm, $script);
-  // run script will always exit with status 1 
-  pclose($vm);
-}
-
-function client_xcode_build($scheme, $config = 'Debug', $sdk = 'iphonesimulator4.3')
-{
-  global $GAME_ROOT;
-
-  $xcode_filter = ". $GAME_ROOT/utils/xcodefilter.sh";
-
-  ensure_mkdir("$GAME_ROOT/build/client");
-  shell(_(
-    "cd $GAME_ROOT/client && " . 
-    "$xcode_filter xcodebuild -workspace %XCODE_WKSPACE% -scheme $scheme -configuration $config -sdk $sdk SYMROOT=$GAME_ROOT/build/client"
-  )); 
-}
-
-function git_get_info()
+function git_get_info() : array
 {
   global $GAME_ROOT;
 
@@ -654,29 +631,29 @@ function git_get_info()
   return array($rev_hash, $branch, $revision_number);
 }
 
-function git_get_rev_hash()
+function git_get_rev_hash() : string
 {
   list($rev_hash, $_, $__) = git_get_info();
   return $rev_hash;
 }
 
-function git_get_branch()
+function git_get_branch() : string
 {
   list($_, $branch, $__) = git_get_info();
   return $branch;
 }
 
-function git_get_rev_number()
+function git_get_rev_number() : string
 {
   list($_, $__, $rev_number) = git_get_info();
   return $rev_number;
 }
 
-function git_try_commit($files, $msg)
+function git_try_commit(string $paths, string $msg)
 {
   try
   {
-    exec("git add $files && git commit -m \"$msg\" && git pull && git push");
+    exec("git add $paths && git commit -m \"$msg\" && git pull && git push");
   }
   catch(Exception $e)
   {
@@ -684,7 +661,7 @@ function git_try_commit($files, $msg)
   }
 }
 
-function check_and_decode_jzon($json)
+function check_and_decode_jzon(string $json) : array
 {
   try
   {
@@ -723,7 +700,7 @@ function make_dir_md5($dir, $md5_file)
   ensure_write($md5_file, $md5);
 }
 
-function file_put_contents_atomic($filename, $content, $mode = 0644) 
+function file_put_contents_atomic(string $filename, string $content, int $mode = 0644) 
 { 
   $temp = tempnam(dirname($filename), 'atomic'); 
   if(!($f = @fopen($temp, 'wb'))) 
@@ -740,15 +717,15 @@ function file_put_contents_atomic($filename, $content, $mode = 0644)
   chmod($filename, $mode); 
 } 
 
-function gmgetdate($ts = null)
+function gmgetdate($ts = null) : array
 { 
   $k = array('seconds','minutes','hours','mday', 
       'wday','mon','year','yday','weekday','month',0); 
-  return(array_combine($k, explode(":", 
-          gmdate('s:i:G:j:w:n:Y:z:l:F:U',is_null($ts)?time():$ts)))); 
+  return array_combine($k, explode(":", 
+          gmdate('s:i:G:j:w:n:Y:z:l:F:U',is_null($ts)?time():$ts))); 
 } 
 
-function prettyJSON($json)
+function prettyJSON(string $json) : string
 {  
   $result = '';
   $level = 0;
@@ -829,12 +806,12 @@ function run_shell_in_project_dir($cmd)
   return $out[0];
 }
 
-function boolstr($b)
+function boolstr(bool $b) : string
 {
   return $b ? 'true' : 'false';
 }
 
-function create_js_template_literal($str)
+function create_js_template_literal(string $str) : string
 {
   $result = str_replace('\\', '\\\\', $str);  // replace  \ -> \\
   $result = str_replace('`', '\\`', $result); // replace  ` -> \`
@@ -842,7 +819,7 @@ function create_js_template_literal($str)
   return "`$result`";
 }
 
-function create_go_string_literal($str)
+function create_go_string_literal(string $str) : string
 {
   $result = str_replace('\\', '\\\\', $str);   // replace  \ -> \\
   $result = str_replace('"', '\\"', $result);  // replace  " -> \"
@@ -850,7 +827,7 @@ function create_go_string_literal($str)
   return '"' . $result . '"';
 }
 
-function convertFileFromDos2UnixFormat($file)
+function convertFileFromDos2UnixFormat(string $file)
 {
   $file_tmp = $file.".tmp";
 
@@ -863,7 +840,7 @@ function convertFileFromDos2UnixFormat($file)
   ensure_rm($file_tmp);
 }
 
-function removeCarriageReturn($file)
+function removeCarriageReturn(string $file)
 {
   $file_tmp = $file.".tmp";
 
@@ -876,14 +853,14 @@ function removeCarriageReturn($file)
   ensure_rm($file_tmp);
 }
 
-function replace_text_in_file($search_pattern, $replace_pattern, $from_file, $to_file)
+function replace_text_in_file(string $search_pattern, string $replace_pattern, string $from_file, string $to_file)
 {
   $file_content = ensure_read($from_file);
   $res = str_replace($search_pattern, $replace_pattern, $file_content);
   ensure_write($to_file, $res);
 }
 
-function gamectl_get_props_as_php_code()
+function gamectl_get_props_as_php_code() : string
 {
   $props = props();
   $props_str = "<?php\nnamespace taskman;\n";
@@ -927,7 +904,7 @@ function run_background_proc($bin, array $args = array(), $redirect_out = '', $r
   }
 }
 
-function run_background_gamectl_workers($task, array $worker_args)
+function run_background_gamectl_workers(string $task, array $worker_args) : array
 {
   global $GAME_ROOT;
 
@@ -1008,17 +985,17 @@ function run_background_gamectl_workers($task, array $worker_args)
   return $results;
 }
 
-function kb($str)
+function kb(string $data) : string
 {
-  return kb_len(strlen($str));
+  return kb_len(strlen($data));
 }
 
-function kb_len($len)
+function kb_len(int $len) : string
 {
   return round($len/1024,2) . "kb";
 }
 
-function gen_uuid_v4()
+function gen_uuid_v4() : string
 {
   $UUID_LENGTH_BYTES = 16;
   $data = random_bytes($UUID_LENGTH_BYTES);
@@ -1029,7 +1006,7 @@ function gen_uuid_v4()
   return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
 }
 
-function watch_running_process($pid, $log_file, $exit_matches = array(), $error_matches = array(), $verbose = true, $break_after_sec = -1, $ignored_errors = array(), $noted_warnings = array())
+function watch_running_process($pid, string $log_file, $exit_matches = array(), $error_matches = array(), bool $verbose = true, $break_after_sec = -1, $ignored_errors = array(), $noted_warnings = array())
 {
   $matches_any_fn = function($buffer, array $matches) 
   { 
@@ -1108,7 +1085,7 @@ function watch_running_process($pid, $log_file, $exit_matches = array(), $error_
   fclose($h);
 }
 
-function check_process($pid)
+function check_process($pid) : int
 {
   if(is_win())
   {
@@ -1123,12 +1100,12 @@ function check_process($pid)
   return $ret;
 }
 
-function which_dir($bin)
+function which_dir(string $bin) : string
 {
   return realpath(dirname(which_path($bin)));
 }
 
-function which_path($bin)
+function which_path(string $bin) : string
 {
   if(is_win())
   {
@@ -1142,7 +1119,7 @@ function which_path($bin)
   }
 }
 
-function arg_exists($args, $needle) 
+function arg_exists(array $args, string $needle) : bool 
 {
   $strict = true;
   return in_array($needle, $args, $strict);
@@ -1182,12 +1159,27 @@ function arg_opt_check_no_trailing(array $args)
 
 function are_you_sure()
 {
-  echo "Are you sure you want to proceed?(type YES): ";
-  $resp = trim(fread(STDIN, 10));
-  //var_dump($resp);
-  if($resp != "YES")
+  if(!are_you_sure_ask())
   {
     echo "exiting then\n";
     exit();
   }
 }
+
+function are_you_sure_ask() : bool
+{
+  echo "Are you sure you want to proceed?(type YES): ";
+  $resp = trim(fread(STDIN, 10));
+  return $resp == "YES";
+}
+
+function names_hash_changed(string $crc_file, array $names) : bool
+{
+  $ctx = hash_init('crc32');
+  foreach($names as $name)
+    hash_update($ctx, $name);
+  $names_crc = hash_final($ctx, true);
+  $changed = !file_exists($crc_file) || ensure_read($crc_file) != $names_crc;
+  ensure_write($crc_file, $names_crc);
+  return $changed;
+}