diff --git a/lib/config.py b/lib/config.py
index 9714928..1219bf7 100644
--- a/lib/config.py
+++ b/lib/config.py
@@ -44,7 +44,7 @@ specified by an environment variable is not an integer, it is ignored.
 from __future__ import print_function
 import os
 
-from pygments.styles import get_all_styles
+from pygments.styles import get_all_styles          # type: ignore
 #def get_all_styles():
 #    return []
 
diff --git a/lib/fmt/internal.py b/lib/fmt/internal.py
index a30ab95..945c676 100644
--- a/lib/fmt/internal.py
+++ b/lib/fmt/internal.py
@@ -5,8 +5,8 @@ Will be merged with panela later.
 
 import re
 
-from colorama import Fore, Back, Style
-import colored
+from colorama import Fore, Back, Style      # type: ignore
+import colored                              # type: ignore
 
 PALETTES = {
     0: {
diff --git a/lib/fmt/markdown.py b/lib/fmt/markdown.py
index e120a8c..5d8a050 100644
--- a/lib/fmt/markdown.py
+++ b/lib/fmt/markdown.py
@@ -8,8 +8,8 @@ Uses external pygments formatters for highlighting (passed as an argument).
 """
 
 import re
-import ansiwrap
-import colored
+import ansiwrap     # type: ignore
+import colored      # type: ignore
 
 def format_text(text, config=None, highlighter=None):
     """
diff --git a/lib/frontend/ansi.py b/lib/frontend/ansi.py
index 276d58b..fbeb28e 100644
--- a/lib/frontend/ansi.py
+++ b/lib/frontend/ansi.py
@@ -26,9 +26,9 @@ import os
 import sys
 import re
 
-import colored
-from pygments import highlight as pygments_highlight
-from pygments.formatters import Terminal256Formatter        # pylint: disable=no-name-in-module
+import colored                                              # type: ignore
+from pygments import highlight as pygments_highlight        # type: ignore
+from pygments.formatters import Terminal256Formatter        # type: ignore # pylint: disable=no-name-in-module
                                                             # pylint: disable=wrong-import-position
 sys.path.append(os.path.abspath(os.path.join(__file__, '..')))
 from config import CONFIG
diff --git a/lib/languages_data.py b/lib/languages_data.py
index fa65953..e13e469 100644
--- a/lib/languages_data.py
+++ b/lib/languages_data.py
@@ -6,7 +6,9 @@ from the project tree.
 
 """
 
-import pygments.lexers
+from typing import Dict
+
+import pygments.lexers                                  # type: ignore
 
 LEXER = {
     "assembly"  : pygments.lexers.NasmLexer,
@@ -85,7 +87,7 @@ LEXER = {
 }
 
 # canonical names are on the right side
-LANGUAGE_ALIAS = {
+LANGUAGE_ALIAS: Dict[str, str]  = {
     'asm'       :   'assembly',
     'assembler' :   'assembly',
     'c++'       :   'cpp',
@@ -108,7 +110,7 @@ LANGUAGE_ALIAS = {
     'm'         :   'octave',
 }
 
-VIM_NAME = {
+VIM_NAME: Dict[str, str]  = {
     'assembly'  :   'asm',
     'bash'      :   'sh',
     'coffeescript': 'coffee',
@@ -135,7 +137,7 @@ VIM_NAME = {
     'flask'     :   'python',
 }
 
-SO_NAME = {
+SO_NAME: Dict[str, str]  = {
     'coffee'    :   'coffeescript',
     'js'        :   'javascript',
     'python3'   :   'python-3.x',
@@ -149,10 +151,10 @@ SO_NAME = {
 # into canonical cheat.sh names
 #
 
-ATOM_FT_NAME = {
+ATOM_FT_NAME: Dict[str, str] = {
 }
 
-EMACS_FT_NAME = {
+EMACS_FT_NAME: Dict[str, str]  = {
     "asm-mode"             : "asm",
     "awk-mode"             : "awk",
     "sh-mode"              : "bash",
@@ -217,16 +219,16 @@ EMACS_FT_NAME = {
     # vim
 }
 
-SUBLIME_FT_NAME = {
+SUBLIME_FT_NAME: Dict[str, str]  = {
 }
 
-VIM_FT_NAME = {
+VIM_FT_NAME: Dict[str, str]  = {
     'asm':          'assembler',
     'javascript':   'js',
     'octave':       'matlab',
 }
 
-VSCODE_FT_NAME = {
+VSCODE_FT_NAME: Dict[str, str]  = {
 }
 
 def rewrite_editor_section_name(section_name):
diff --git a/requirements.txt b/requirements.txt
index d74ff77..885e58e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,3 +15,4 @@ pycld2
 colorama
 pyyaml
 python-Levenshtein
+pylint
diff --git a/tests/mypy.sh b/tests/mypy.sh
new file mode 100755
index 0000000..424b01b
--- /dev/null
+++ b/tests/mypy.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+SKIP_FILES=(
+  lib/adapter/adapter.py
+  lib/adapter/cmd.py
+  lib/adapter/latenz.py
+  lib/adapter/learnxiny.py
+  lib/adapter/question.py
+  lib/adapter/internal.py
+)
+
+contains_element () {
+  local e match="$1"
+  shift
+  for e; do [[ "$e" == "$match" ]] && return 0; done
+  return 1
+}
+
+_mypy() {
+  local file
+  local result=0
+  
+  # mypy lib/*.py lib/fmt/*.py lib/frontend/*.py
+
+  for file in lib/*.py lib/fmt/*.py lib/frontend/*.py lib/adapter/*.py
+  do
+    contains_element "$file" "${SKIP_FILES[@]}" && continue
+    mypy --follow-imports=skip "$file" || result=1
+  done
+
+  return "$result"    
+}
+
+_mypy