diff --git a/plugin_example/slither_my_plugin/__init__.py b/plugin_example/slither_my_plugin/__init__.py
index eabdb147e..9379ac833 100644
--- a/plugin_example/slither_my_plugin/__init__.py
+++ b/plugin_example/slither_my_plugin/__init__.py
@@ -1,8 +1,13 @@
+from typing import Tuple, List, Type
+
 from slither_my_plugin.detectors.example import Example
 
+from slither.detectors.abstract_detector import AbstractDetector
+from slither.printers.abstract_printer import AbstractPrinter
+
 
-def make_plugin():
+def make_plugin() -> Tuple[List[Type[AbstractDetector]], List[Type[AbstractPrinter]]]:
     plugin_detectors = [Example]
-    plugin_printers = []
+    plugin_printers: List[Type[AbstractPrinter]] = []
 
     return plugin_detectors, plugin_printers
diff --git a/slither/__main__.py b/slither/__main__.py
index 4cf148f13..98320c76a 100644
--- a/slither/__main__.py
+++ b/slither/__main__.py
@@ -10,11 +10,11 @@ import os
 import pstats
 import sys
 import traceback
-from typing import Tuple, Optional, List, Dict
+from typing import Tuple, Optional, List, Dict, Type, Union, Any, Sequence
 
 from pkg_resources import iter_entry_points, require
 
-from crytic_compile import cryticparser
+from crytic_compile import cryticparser, CryticCompile
 from crytic_compile.platform.standard import generate_standard_export
 from crytic_compile.platform.etherscan import SUPPORTED_NETWORK
 from crytic_compile import compile_all, is_supported
@@ -55,10 +55,10 @@ logger = logging.getLogger("Slither")
 
 
 def process_single(
-    target: str,
+    target: Union[str, CryticCompile],
     args: argparse.Namespace,
-    detector_classes: List[AbstractDetector],
-    printer_classes: List[AbstractPrinter],
+    detector_classes: List[Type[AbstractDetector]],
+    printer_classes: List[Type[AbstractPrinter]],
 ) -> Tuple[Slither, List[Dict], List[Dict], int]:
     """
     The core high-level code for running Slither static analysis.
@@ -80,8 +80,8 @@ def process_single(
 def process_all(
     target: str,
     args: argparse.Namespace,
-    detector_classes: List[AbstractDetector],
-    printer_classes: List[AbstractPrinter],
+    detector_classes: List[Type[AbstractDetector]],
+    printer_classes: List[Type[AbstractPrinter]],
 ) -> Tuple[List[Slither], List[Dict], List[Dict], int]:
     compilations = compile_all(target, **vars(args))
     slither_instances = []
@@ -109,8 +109,8 @@ def process_all(
 
 def _process(
     slither: Slither,
-    detector_classes: List[AbstractDetector],
-    printer_classes: List[AbstractPrinter],
+    detector_classes: List[Type[AbstractDetector]],
+    printer_classes: List[Type[AbstractPrinter]],
 ) -> Tuple[Slither, List[Dict], List[Dict], int]:
     for detector_cls in detector_classes:
         slither.register_detector(detector_cls)
@@ -137,13 +137,14 @@ def _process(
     return slither, results_detectors, results_printers, analyzed_contracts_count
 
 
+# TODO: delete me?
 def process_from_asts(
     filenames: List[str],
     args: argparse.Namespace,
-    detector_classes: List[AbstractDetector],
-    printer_classes: List[AbstractPrinter],
-):
-    all_contracts = []
+    detector_classes: List[Type[AbstractDetector]],
+    printer_classes: List[Type[AbstractPrinter]],
+) -> Tuple[Slither, List[Dict], List[Dict], int]:
+    all_contracts: List[str] = []
 
     for filename in filenames:
         with open(filename, encoding="utf8") as file_open:
@@ -162,13 +163,15 @@ def process_from_asts(
 ###################################################################################
 
 
-def get_detectors_and_printers():
+def get_detectors_and_printers() -> Tuple[
+    List[Type[AbstractDetector]], List[Type[AbstractPrinter]]
+]:
 
-    detectors = [getattr(all_detectors, name) for name in dir(all_detectors)]
-    detectors = [d for d in detectors if inspect.isclass(d) and issubclass(d, AbstractDetector)]
+    detectors_ = [getattr(all_detectors, name) for name in dir(all_detectors)]
+    detectors = [d for d in detectors_ if inspect.isclass(d) and issubclass(d, AbstractDetector)]
 
-    printers = [getattr(all_printers, name) for name in dir(all_printers)]
-    printers = [p for p in printers if inspect.isclass(p) and issubclass(p, AbstractPrinter)]
+    printers_ = [getattr(all_printers, name) for name in dir(all_printers)]
+    printers = [p for p in printers_ if inspect.isclass(p) and issubclass(p, AbstractPrinter)]
 
     # Handle plugins!
     for entry_point in iter_entry_points(group="slither_analyzer.plugin", name=None):
@@ -194,8 +197,8 @@ def get_detectors_and_printers():
 
 # pylint: disable=too-many-branches
 def choose_detectors(
-    args: argparse.Namespace, all_detector_classes: List[AbstractDetector]
-) -> List[AbstractDetector]:
+    args: argparse.Namespace, all_detector_classes: List[Type[AbstractDetector]]
+) -> List[Type[AbstractDetector]]:
     # If detectors are specified, run only these ones
 
     detectors_to_run = []
@@ -245,8 +248,8 @@ def choose_detectors(
 
 
 def choose_printers(
-    args: argparse.Namespace, all_printer_classes: List[AbstractPrinter]
-) -> List[AbstractPrinter]:
+    args: argparse.Namespace, all_printer_classes: List[Type[AbstractPrinter]]
+) -> List[Type[AbstractPrinter]]:
     printers_to_run = []
 
     # disable default printer
@@ -273,13 +276,16 @@ def choose_printers(
 ###################################################################################
 
 
-def parse_filter_paths(args):
+def parse_filter_paths(args: argparse.Namespace) -> List[str]:
     if args.filter_paths:
         return args.filter_paths.split(",")
     return []
 
 
-def parse_args(detector_classes, printer_classes):  # pylint: disable=too-many-statements
+# pylint: disable=too-many-statements
+def parse_args(
+    detector_classes: List[Type[AbstractDetector]], printer_classes: List[Type[AbstractPrinter]]
+) -> argparse.Namespace:
 
     usage = "slither target [flag]\n"
     usage += "\ntarget can be:\n"
@@ -622,7 +628,9 @@ class ListDetectors(argparse.Action):  # pylint: disable=too-few-public-methods
 
 
 class ListDetectorsJson(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, *args, **kwargs):  # pylint: disable=signature-differs
+    def __call__(
+        self, parser: Any, *args: Any, **kwargs: Any
+    ) -> None:  # pylint: disable=signature-differs
         detectors, _ = get_detectors_and_printers()
         detector_types_json = output_detectors_json(detectors)
         print(json.dumps(detector_types_json))
@@ -630,22 +638,38 @@ class ListDetectorsJson(argparse.Action):  # pylint: disable=too-few-public-meth
 
 
 class ListPrinters(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, *args, **kwargs):  # pylint: disable=signature-differs
+    def __call__(
+        self, parser: Any, *args: Any, **kwargs: Any
+    ) -> None:  # pylint: disable=signature-differs
         _, printers = get_detectors_and_printers()
         output_printers(printers)
         parser.exit()
 
 
 class OutputMarkdown(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, args, values, option_string=None):
+    def __call__(
+        self,
+        parser: Any,
+        args: Any,
+        values: Optional[Union[str, Sequence[Any]]],
+        option_string: Any = None,
+    ) -> None:
         detectors, printers = get_detectors_and_printers()
+        assert isinstance(values, str)
         output_to_markdown(detectors, printers, values)
         parser.exit()
 
 
 class OutputWiki(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, args, values, option_string=None):
+    def __call__(
+        self,
+        parser: Any,
+        args: Any,
+        values: Optional[Union[str, Sequence[Any]]],
+        option_string: Any = None,
+    ) -> None:
         detectors, _ = get_detectors_and_printers()
+        assert isinstance(values, str)
         output_wiki(detectors, values)
         parser.exit()
 
@@ -678,7 +702,7 @@ class FormatterCryticCompile(logging.Formatter):
 ###################################################################################
 
 
-def main():
+def main() -> None:
     # Codebase with complex domninators can lead to a lot of SSA recursive call
     sys.setrecursionlimit(1500)
 
@@ -689,8 +713,9 @@ def main():
 
 # pylint: disable=too-many-statements,too-many-branches,too-many-locals
 def main_impl(
-    all_detector_classes: List[AbstractDetector], all_printer_classes: List[AbstractPrinter]
-):
+    all_detector_classes: List[Type[AbstractDetector]],
+    all_printer_classes: List[Type[AbstractPrinter]],
+) -> None:
     """
     :param all_detector_classes: A list of all detectors that can be included/excluded.
     :param all_printer_classes: A list of all printers that can be included.
@@ -756,8 +781,8 @@ def main_impl(
     crytic_compile_error.propagate = False
     crytic_compile_error.setLevel(logging.INFO)
 
-    results_detectors = []
-    results_printers = []
+    results_detectors: List[Dict] = []
+    results_printers: List[Dict] = []
     try:
         filename = args.filename
 
@@ -806,6 +831,7 @@ def main_impl(
             if "compilations" in args.json_types:
                 compilation_results = []
                 for slither_instance in slither_instances:
+                    assert slither_instance.crytic_compile
                     compilation_results.append(
                         generate_standard_export(slither_instance.crytic_compile)
                     )
@@ -856,7 +882,7 @@ def main_impl(
 
     except Exception:  # pylint: disable=broad-except
         output_error = traceback.format_exc()
-        logging.error(traceback.print_exc())
+        traceback.print_exc()
         logging.error(f"Error in {args.filename}")  # pylint: disable=logging-fstring-interpolation
         logging.error(output_error)
 
@@ -879,7 +905,7 @@ def main_impl(
     if outputting_zip:
         output_to_zip(args.zip, output_error, json_results, args.zip_type)
 
-    if args.perf:
+    if args.perf and cp:
         cp.disable()
         stats = pstats.Stats(cp).sort_stats("cumtime")
         stats.print_stats()
diff --git a/slither/core/declarations/structure.py b/slither/core/declarations/structure.py
index 39b1948ee..8f6d8c50a 100644
--- a/slither/core/declarations/structure.py
+++ b/slither/core/declarations/structure.py
@@ -8,10 +8,10 @@ if TYPE_CHECKING:
 
 
 class Structure(SourceMapping):
-    def __init__(self, compilation_unit: "SlitherCompilationUnit"):
+    def __init__(self, compilation_unit: "SlitherCompilationUnit") -> None:
         super().__init__()
         self._name: Optional[str] = None
-        self._canonical_name = None
+        self._canonical_name: Optional[str] = None
         self._elems: Dict[str, "StructureVariable"] = {}
         # Name of the elements in the order of declaration
         self._elems_ordered: List[str] = []
@@ -19,25 +19,27 @@ class Structure(SourceMapping):
 
     @property
     def canonical_name(self) -> str:
+        assert self._canonical_name
         return self._canonical_name
 
     @canonical_name.setter
-    def canonical_name(self, name: str):
+    def canonical_name(self, name: str) -> None:
         self._canonical_name = name
 
     @property
     def name(self) -> str:
+        assert self._name
         return self._name
 
     @name.setter
-    def name(self, new_name: str):
+    def name(self, new_name: str) -> None:
         self._name = new_name
 
     @property
     def elems(self) -> Dict[str, "StructureVariable"]:
         return self._elems
 
-    def add_elem_in_order(self, s: str):
+    def add_elem_in_order(self, s: str) -> None:
         self._elems_ordered.append(s)
 
     @property
@@ -47,5 +49,5 @@ class Structure(SourceMapping):
             ret.append(self._elems[e])
         return ret
 
-    def __str__(self):
+    def __str__(self) -> str:
         return self.name
diff --git a/slither/core/expressions/tuple_expression.py b/slither/core/expressions/tuple_expression.py
index 7f14601f4..1fd8fc795 100644
--- a/slither/core/expressions/tuple_expression.py
+++ b/slither/core/expressions/tuple_expression.py
@@ -4,7 +4,7 @@ from slither.core.expressions.expression import Expression
 
 
 class TupleExpression(Expression):
-    def __init__(self, expressions):
+    def __init__(self, expressions: List[Expression]) -> None:
         assert all(isinstance(x, Expression) for x in expressions if x)
         super().__init__()
         self._expressions = expressions
@@ -13,6 +13,6 @@ class TupleExpression(Expression):
     def expressions(self) -> List[Expression]:
         return self._expressions
 
-    def __str__(self):
+    def __str__(self) -> str:
         expressions_str = [str(e) for e in self.expressions]
         return "(" + ",".join(expressions_str) + ")"
diff --git a/slither/core/source_mapping/source_mapping.py b/slither/core/source_mapping/source_mapping.py
index 7ceabd568..ee5211c7c 100644
--- a/slither/core/source_mapping/source_mapping.py
+++ b/slither/core/source_mapping/source_mapping.py
@@ -162,13 +162,15 @@ def _convert_source_mapping(
 
 
 class SourceMapping(Context, metaclass=ABCMeta):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         #        self._source_mapping: Optional[Dict] = None
         self.source_mapping: Source = Source()
         self.references: List[Source] = []
 
-    def set_offset(self, offset: Union["Source", str], compilation_unit: "SlitherCompilationUnit"):
+    def set_offset(
+        self, offset: Union["Source", str], compilation_unit: "SlitherCompilationUnit"
+    ) -> None:
         if isinstance(offset, Source):
             self.source_mapping.start = offset.start
             self.source_mapping.length = offset.length
@@ -184,6 +186,6 @@ class SourceMapping(Context, metaclass=ABCMeta):
 
     def add_reference_from_raw_source(
         self, offset: str, compilation_unit: "SlitherCompilationUnit"
-    ):
+    ) -> None:
         s = _convert_source_mapping(offset, compilation_unit)
         self.references.append(s)
diff --git a/slither/slither.py b/slither/slither.py
index 59bbf8a5f..dcfc0ad7e 100644
--- a/slither/slither.py
+++ b/slither/slither.py
@@ -1,5 +1,5 @@
 import logging
-from typing import Union, List, ValuesView
+from typing import Union, List, ValuesView, Type, Dict
 
 from crytic_compile import CryticCompile, InvalidCompilation
 
@@ -19,7 +19,9 @@ logger_detector = logging.getLogger("Detectors")
 logger_printer = logging.getLogger("Printers")
 
 
-def _check_common_things(thing_name, cls, base_cls, instances_list):
+def _check_common_things(
+    thing_name: str, cls: Type, base_cls: Type, instances_list: List[Type[AbstractDetector]]
+) -> None:
 
     if not issubclass(cls, base_cls) or cls is base_cls:
         raise Exception(
@@ -178,7 +180,7 @@ class Slither(SlitherCore):  # pylint: disable=too-many-instance-attributes
     def detectors_optimization(self):
         return [d for d in self.detectors if d.IMPACT == DetectorClassification.OPTIMIZATION]
 
-    def register_detector(self, detector_class):
+    def register_detector(self, detector_class: Type[AbstractDetector]) -> None:
         """
         :param detector_class: Class inheriting from `AbstractDetector`.
         """
@@ -188,7 +190,7 @@ class Slither(SlitherCore):  # pylint: disable=too-many-instance-attributes
             instance = detector_class(compilation_unit, self, logger_detector)
             self._detectors.append(instance)
 
-    def register_printer(self, printer_class):
+    def register_printer(self, printer_class: Type[AbstractPrinter]) -> None:
         """
         :param printer_class: Class inheriting from `AbstractPrinter`.
         """
@@ -197,7 +199,7 @@ class Slither(SlitherCore):  # pylint: disable=too-many-instance-attributes
         instance = printer_class(self, logger_printer)
         self._printers.append(instance)
 
-    def run_detectors(self):
+    def run_detectors(self) -> List[Dict]:
         """
         :return: List of registered detectors results.
         """
diff --git a/slither/slithir/operations/call.py b/slither/slithir/operations/call.py
index cff2767cd..07304fa99 100644
--- a/slither/slithir/operations/call.py
+++ b/slither/slithir/operations/call.py
@@ -1,8 +1,10 @@
+from typing import Optional, List
+
 from slither.slithir.operations.operation import Operation
 
 
 class Call(Operation):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
         self._arguments = []
 
@@ -14,14 +16,14 @@ class Call(Operation):
     def arguments(self, v):
         self._arguments = v
 
-    def can_reenter(self, _callstack=None):  # pylint: disable=no-self-use
+    def can_reenter(self, _callstack: Optional[List] = None) -> bool:  # pylint: disable=no-self-use
         """
         Must be called after slithIR analysis pass
         :return: bool
         """
         return False
 
-    def can_send_eth(self):  # pylint: disable=no-self-use
+    def can_send_eth(self) -> bool:  # pylint: disable=no-self-use
         """
         Must be called after slithIR analysis pass
         :return: bool
diff --git a/slither/slithir/tmp_operations/tmp_call.py b/slither/slithir/tmp_operations/tmp_call.py
index e9562b1c1..fb6641139 100644
--- a/slither/slithir/tmp_operations/tmp_call.py
+++ b/slither/slithir/tmp_operations/tmp_call.py
@@ -63,14 +63,14 @@ class TmpCall(OperationWithLValue):  # pylint: disable=too-many-instance-attribu
     def call_id(self):
         return self._callid
 
-    @property
-    def read(self):
-        return [self.called]
-
     @call_id.setter
     def call_id(self, c):
         self._callid = c
 
+    @property
+    def read(self):
+        return [self.called]
+
     @property
     def called(self):
         return self._called
diff --git a/slither/slithir/tmp_operations/tmp_new_elementary_type.py b/slither/slithir/tmp_operations/tmp_new_elementary_type.py
index 357c063a7..d7a4f5e1b 100644
--- a/slither/slithir/tmp_operations/tmp_new_elementary_type.py
+++ b/slither/slithir/tmp_operations/tmp_new_elementary_type.py
@@ -1,21 +1,23 @@
+from typing import List
+
 from slither.slithir.operations.lvalue import OperationWithLValue
 from slither.core.solidity_types.elementary_type import ElementaryType
 
 
 class TmpNewElementaryType(OperationWithLValue):
-    def __init__(self, new_type, lvalue):
+    def __init__(self, new_type: ElementaryType, lvalue):
         assert isinstance(new_type, ElementaryType)
         super().__init__()
-        self._type = new_type
+        self._type: ElementaryType = new_type
         self._lvalue = lvalue
 
     @property
-    def read(self):
+    def read(self) -> List:
         return []
 
     @property
-    def type(self):
+    def type(self) -> ElementaryType:
         return self._type
 
-    def __str__(self):
+    def __str__(self) -> str:
         return f"{self.lvalue} = new {self._type}"
diff --git a/slither/tools/demo/__main__.py b/slither/tools/demo/__main__.py
index 37d265bb1..5bc2c7c8e 100644
--- a/slither/tools/demo/__main__.py
+++ b/slither/tools/demo/__main__.py
@@ -9,7 +9,7 @@ logging.getLogger("Slither").setLevel(logging.INFO)
 logger = logging.getLogger("Slither-demo")
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     """
     Parse the underlying arguments for the program.
     :return: Returns the arguments for the program.
@@ -26,7 +26,7 @@ def parse_args():
     return parser.parse_args()
 
 
-def main():
+def main() -> None:
     args = parse_args()
 
     # Perform slither analysis on the given filename
diff --git a/slither/tools/erc_conformance/__main__.py b/slither/tools/erc_conformance/__main__.py
index 45e57b55c..ef594a7c6 100644
--- a/slither/tools/erc_conformance/__main__.py
+++ b/slither/tools/erc_conformance/__main__.py
@@ -1,6 +1,7 @@
 import argparse
 import logging
 from collections import defaultdict
+from typing import Any, Dict, List
 
 from crytic_compile import cryticparser
 from slither import Slither
@@ -26,7 +27,7 @@ logger.propagate = False
 ADDITIONAL_CHECKS = {"ERC20": check_erc20, "ERC1155": check_erc1155}
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     """
     Parse the underlying arguments for the program.
     :return: Returns the arguments for the program.
@@ -63,20 +64,20 @@ def parse_args():
     return parser.parse_args()
 
 
-def _log_error(err, args):
+def _log_error(err: Any, args: argparse.Namespace) -> None:
     if args.json:
         output_to_json(args.json, str(err), {"upgradeability-check": []})
 
     logger.error(err)
 
 
-def main():
+def main() -> None:
     args = parse_args()
 
     # Perform slither analysis on the given filename
     slither = Slither(args.project, **vars(args))
 
-    ret = defaultdict(list)
+    ret: Dict[str, List] = defaultdict(list)
 
     if args.erc.upper() in ERCS:
 
diff --git a/slither/tools/erc_conformance/erc/ercs.py b/slither/tools/erc_conformance/erc/ercs.py
index ef459eef9..a6b9050ae 100644
--- a/slither/tools/erc_conformance/erc/ercs.py
+++ b/slither/tools/erc_conformance/erc/ercs.py
@@ -1,7 +1,10 @@
 import logging
+from typing import Dict, List, Optional, Set
 
+from slither.core.declarations import Contract
 from slither.slithir.operations import EventCall
 from slither.utils import output
+from slither.utils.erc import ERC, ERC_EVENT
 from slither.utils.type import (
     export_nested_types_from_variable,
     export_return_type_from_variable,
@@ -11,7 +14,7 @@ logger = logging.getLogger("Slither-conformance")
 
 
 # pylint: disable=too-many-locals,too-many-branches,too-many-statements
-def _check_signature(erc_function, contract, ret):
+def _check_signature(erc_function: ERC, contract: Contract, ret: Dict) -> None:
     name = erc_function.name
     parameters = erc_function.parameters
     return_type = erc_function.return_type
@@ -146,7 +149,7 @@ def _check_signature(erc_function, contract, ret):
                     ret["missing_event_emmited"].append(missing_event_emmited.data)
 
 
-def _check_events(erc_event, contract, ret):
+def _check_events(erc_event: ERC_EVENT, contract: Contract, ret: Dict[str, List]) -> None:
     name = erc_event.name
     parameters = erc_event.parameters
     indexes = erc_event.indexes
@@ -180,7 +183,13 @@ def _check_events(erc_event, contract, ret):
                 ret["missing_event_index"].append(missing_event_index.data)
 
 
-def generic_erc_checks(contract, erc_functions, erc_events, ret, explored=None):
+def generic_erc_checks(
+    contract: Contract,
+    erc_functions: List[ERC],
+    erc_events: List[ERC_EVENT],
+    ret: Dict[str, List],
+    explored: Optional[Set[Contract]] = None,
+) -> None:
 
     if explored is None:
         explored = set()
diff --git a/slither/tools/flattening/__main__.py b/slither/tools/flattening/__main__.py
index 977b84896..bf9856fe8 100644
--- a/slither/tools/flattening/__main__.py
+++ b/slither/tools/flattening/__main__.py
@@ -18,7 +18,7 @@ logger = logging.getLogger("Slither")
 logger.setLevel(logging.INFO)
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     """
     Parse the underlying arguments for the program.
     :return: Returns the arguments for the program.
@@ -106,7 +106,7 @@ def parse_args():
     return parser.parse_args()
 
 
-def main():
+def main() -> None:
     args = parse_args()
 
     slither = Slither(args.filename, **vars(args))
diff --git a/slither/tools/kspec_coverage/__main__.py b/slither/tools/kspec_coverage/__main__.py
index b6ce0f81b..19933e0fe 100644
--- a/slither/tools/kspec_coverage/__main__.py
+++ b/slither/tools/kspec_coverage/__main__.py
@@ -16,7 +16,7 @@ logger.handlers[0].setFormatter(formatter)
 logger.propagate = False
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     """
     Parse the underlying arguments for the program.
     :return: Returns the arguments for the program.
@@ -56,7 +56,7 @@ def parse_args():
     return parser.parse_args()
 
 
-def main():
+def main() -> None:
     # ------------------------------
     #       Usage: slither-kspec-coverage contract kspec
     #       Example: slither-kspec-coverage contract.sol kspec.md
diff --git a/slither/tools/kspec_coverage/kspec_coverage.py b/slither/tools/kspec_coverage/kspec_coverage.py
index 569a35cf1..f8c2d8cf2 100755
--- a/slither/tools/kspec_coverage/kspec_coverage.py
+++ b/slither/tools/kspec_coverage/kspec_coverage.py
@@ -1,8 +1,10 @@
+import argparse
+
 from slither.tools.kspec_coverage.analysis import run_analysis
 from slither import Slither
 
 
-def kspec_coverage(args):
+def kspec_coverage(args: argparse.Namespace) -> None:
 
     contract = args.contract
     kspec = args.kspec
diff --git a/slither/tools/mutator/__main__.py b/slither/tools/mutator/__main__.py
index 442b4849d..78b86d681 100644
--- a/slither/tools/mutator/__main__.py
+++ b/slither/tools/mutator/__main__.py
@@ -2,6 +2,7 @@ import argparse
 import inspect
 import logging
 import sys
+from typing import Type, List, Any
 
 from crytic_compile import cryticparser
 
@@ -22,7 +23,7 @@ logger.setLevel(logging.INFO)
 ###################################################################################
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
         description="Experimental smart contract mutator. Based on https://arxiv.org/abs/2006.11597",
         usage="slither-mutate target",
@@ -48,14 +49,16 @@ def parse_args():
     return parser.parse_args()
 
 
-def _get_mutators():
-    detectors = [getattr(all_mutators, name) for name in dir(all_mutators)]
-    detectors = [c for c in detectors if inspect.isclass(c) and issubclass(c, AbstractMutator)]
+def _get_mutators() -> List[Type[AbstractMutator]]:
+    detectors_ = [getattr(all_mutators, name) for name in dir(all_mutators)]
+    detectors = [c for c in detectors_ if inspect.isclass(c) and issubclass(c, AbstractMutator)]
     return detectors
 
 
 class ListMutators(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, *args, **kwargs):  # pylint: disable=signature-differs
+    def __call__(
+        self, parser: Any, *args: Any, **kwargs: Any
+    ) -> None:  # pylint: disable=signature-differs
         checks = _get_mutators()
         output_mutators(checks)
         parser.exit()
diff --git a/slither/tools/possible_paths/__main__.py b/slither/tools/possible_paths/__main__.py
index 29cd05c46..b993d266a 100644
--- a/slither/tools/possible_paths/__main__.py
+++ b/slither/tools/possible_paths/__main__.py
@@ -5,6 +5,7 @@ from argparse import ArgumentParser, Namespace
 
 from crytic_compile import cryticparser
 from slither import Slither
+from slither.core.declarations import FunctionContract
 from slither.utils.colors import red
 from slither.tools.possible_paths.possible_paths import (
     find_target_paths,
@@ -58,7 +59,11 @@ def main() -> None:
     # Print out all target functions.
     print("Target functions:")
     for target in targets:
-        print(f"- {target.contract_declarer.name}.{target.full_name}")
+        if isinstance(target, FunctionContract):
+            print(f"- {target.contract_declarer.name}.{target.full_name}")
+        else:
+            pass
+            # TODO implement me
     print("\n")
 
     # Obtain all paths which reach the target functions.
diff --git a/slither/tools/possible_paths/possible_paths.py b/slither/tools/possible_paths/possible_paths.py
index 9e52ed6b7..6e836e76a 100644
--- a/slither/tools/possible_paths/possible_paths.py
+++ b/slither/tools/possible_paths/possible_paths.py
@@ -1,8 +1,15 @@
+from typing import List, Tuple, Union, Optional, Set
+
+from slither import Slither
+from slither.core.declarations import Function, FunctionContract
+from slither.core.slither_core import SlitherCore
+
+
 class ResolveFunctionException(Exception):
     pass
 
 
-def resolve_function(slither, contract_name, function_name):
+def resolve_function(slither: SlitherCore, contract_name: str, function_name: str) -> Function:
     """
     Resolves a function instance, given a contract name and function.
     :param contract_name: The name of the contract the function is declared in.
@@ -32,7 +39,9 @@ def resolve_function(slither, contract_name, function_name):
     return target_function
 
 
-def resolve_functions(slither, functions):
+def resolve_functions(
+    slither: Slither, functions: List[Union[str, Tuple[str, str]]]
+) -> List[Function]:
     """
     Resolves the provided function descriptors.
     :param functions: A list of tuples (contract_name, function_name) or str (of form "ContractName.FunctionName")
@@ -40,7 +49,7 @@ def resolve_functions(slither, functions):
     :return: Returns a list of resolved functions.
     """
     # Create the resolved list.
-    resolved = []
+    resolved: List[Function] = []
 
     # Verify that the provided argument is a list.
     if not isinstance(functions, list):
@@ -72,24 +81,31 @@ def resolve_functions(slither, functions):
     return resolved
 
 
-def all_function_definitions(function):
+def all_function_definitions(function: Function) -> List[Function]:
     """
     Obtains a list of representing this function and any base definitions
     :param function: The function to obtain all definitions at and beneath.
     :return: Returns a list composed of the provided function definition and any base definitions.
     """
-    return [function] + [
+    # TODO implement me
+    if not isinstance(function, FunctionContract):
+        return []
+    ret: List[Function] = [function]
+    ret += [
         f
         for c in function.contract.inheritance
         for f in c.functions_and_modifiers_declared
         if f.full_name == function.full_name
     ]
+    return ret
 
 
-def __find_target_paths(slither, target_function, current_path=None):
+def __find_target_paths(
+    slither: SlitherCore, target_function: Function, current_path: Optional[List[Function]] = None
+) -> Set[Tuple[Function, ...]]:
     current_path = current_path if current_path else []
     # Create our results list
-    results = set()
+    results: Set[Tuple[Function, ...]] = set()
 
     # Add our current function to the path.
     current_path = [target_function] + current_path
@@ -106,9 +122,12 @@ def __find_target_paths(slither, target_function, current_path=None):
                 continue
 
             # Find all function calls in this function (except for low level)
-            called_functions = [f for (_, f) in function.high_level_calls + function.library_calls]
-            called_functions += function.internal_calls
-            called_functions = set(called_functions)
+            called_functions_list = [
+                f for (_, f) in function.high_level_calls if isinstance(f, Function)
+            ]
+            called_functions_list += [f for (_, f) in function.library_calls]
+            called_functions_list += [f for f in function.internal_calls if isinstance(f, Function)]
+            called_functions = set(called_functions_list)
 
             # If any of our target functions are reachable from this function, it's a result.
             if all_target_functions.intersection(called_functions):
@@ -123,14 +142,16 @@ def __find_target_paths(slither, target_function, current_path=None):
     return results
 
 
-def find_target_paths(slither, target_functions):
+def find_target_paths(
+    slither: SlitherCore, target_functions: List[Function]
+) -> Set[Tuple[Function, ...]]:
     """
     Obtains all functions which can lead to any of the target functions being called.
     :param target_functions: The functions we are interested in reaching.
     :return: Returns a list of all functions which can reach any of the target_functions.
     """
     # Create our results list
-    results = set()
+    results: Set[Tuple[Function, ...]] = set()
 
     # Loop for each target function
     for target_function in target_functions:
diff --git a/slither/tools/properties/__main__.py b/slither/tools/properties/__main__.py
index 91c990669..10837bb4b 100644
--- a/slither/tools/properties/__main__.py
+++ b/slither/tools/properties/__main__.py
@@ -1,6 +1,7 @@
 import argparse
 import logging
 import sys
+from typing import Any
 
 from crytic_compile import cryticparser
 
@@ -26,7 +27,7 @@ logger.handlers[0].setFormatter(formatter)
 logger.propagate = False
 
 
-def _all_scenarios():
+def _all_scenarios() -> str:
     txt = "\n"
     txt += "#################### ERC20 ####################\n"
     for k, value in ERC20_PROPERTIES.items():
@@ -35,29 +36,33 @@ def _all_scenarios():
     return txt
 
 
-def _all_properties():
+def _all_properties() -> MyPrettyTable:
     table = MyPrettyTable(["Num", "Description", "Scenario"])
     idx = 0
     for scenario, value in ERC20_PROPERTIES.items():
         for prop in value.properties:
-            table.add_row([idx, prop.description, scenario])
+            table.add_row([str(idx), prop.description, scenario])
             idx = idx + 1
     return table
 
 
 class ListScenarios(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, *args, **kwargs):  # pylint: disable=signature-differs
+    def __call__(
+        self, parser: Any, *args: Any, **kwargs: Any
+    ) -> None:  # pylint: disable=signature-differs
         logger.info(_all_scenarios())
         parser.exit()
 
 
 class ListProperties(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, *args, **kwargs):  # pylint: disable=signature-differs
+    def __call__(
+        self, parser: Any, *args: Any, **kwargs: Any
+    ) -> None:  # pylint: disable=signature-differs
         logger.info(_all_properties())
         parser.exit()
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     """
     Parse the underlying arguments for the program.
     :return: Returns the arguments for the program.
@@ -120,7 +125,7 @@ def parse_args():
     return parser.parse_args()
 
 
-def main():
+def main() -> None:
     args = parse_args()
 
     # Perform slither analysis on the given filename
diff --git a/slither/tools/properties/platforms/truffle.py b/slither/tools/properties/platforms/truffle.py
index dc83eb273..7d2f3d9b6 100644
--- a/slither/tools/properties/platforms/truffle.py
+++ b/slither/tools/properties/platforms/truffle.py
@@ -15,7 +15,7 @@ PATTERN_TRUFFLE_MIGRATION = re.compile("^[0-9]*_")
 logger = logging.getLogger("Slither")
 
 
-def _extract_caller(p: PropertyCaller):
+def _extract_caller(p: PropertyCaller) -> List[str]:
     if p == PropertyCaller.OWNER:
         return ["owner"]
     if p == PropertyCaller.SENDER:
@@ -28,7 +28,7 @@ def _extract_caller(p: PropertyCaller):
     return ["user"]
 
 
-def _helpers():
+def _helpers() -> str:
     """
     Generate two functions:
     - catchRevertThrowReturnFalse: check if the call revert/throw or return false
@@ -75,7 +75,7 @@ def generate_unit_test(  # pylint: disable=too-many-arguments,too-many-branches
     output_dir: Path,
     addresses: Addresses,
     assert_message: str = "",
-):
+) -> Path:
     """
     Generate unit tests files
     :param test_contract:
@@ -134,7 +134,7 @@ def generate_unit_test(  # pylint: disable=too-many-arguments,too-many-branches
     return output_dir
 
 
-def generate_migration(test_contract: str, output_dir: Path, owner_address: str):
+def generate_migration(test_contract: str, output_dir: Path, owner_address: str) -> None:
     """
     Generate migration file
     :param test_contract:
diff --git a/slither/tools/properties/utils.py b/slither/tools/properties/utils.py
index bdc5bdd68..5a0153211 100644
--- a/slither/tools/properties/utils.py
+++ b/slither/tools/properties/utils.py
@@ -12,7 +12,7 @@ def write_file(
     content: str,
     allow_overwrite: bool = True,
     discard_if_exist: bool = False,
-):
+) -> None:
     """
     Write the content into output_dir/filename
     :param output_dir:
diff --git a/slither/tools/similarity/__main__.py b/slither/tools/similarity/__main__.py
index 21ba88681..86673fccd 100755
--- a/slither/tools/similarity/__main__.py
+++ b/slither/tools/similarity/__main__.py
@@ -17,7 +17,7 @@ logger = logging.getLogger("Slither-simil")
 modes = ["info", "test", "train", "plot"]
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
         description="Code similarity detection tool. For usage, see https://github.com/crytic/slither/wiki/Code-Similarity-detector"
     )
@@ -78,7 +78,7 @@ def parse_args():
 ###################################################################################
 
 
-def main():
+def main() -> None:
     args = parse_args()
 
     default_log = logging.INFO
diff --git a/slither/tools/similarity/encode.py b/slither/tools/similarity/encode.py
index c69de91b8..9889644fb 100644
--- a/slither/tools/similarity/encode.py
+++ b/slither/tools/similarity/encode.py
@@ -74,7 +74,7 @@ def parse_target(target):
     return None
 
 
-def load_and_encode(infile, vmodel, ext=None, nsamples=None, **kwargs):
+def load_and_encode(infile: str, vmodel, ext=None, nsamples=None, **kwargs):
     r = {}
     if infile.endswith(".npz"):
         r = load_cache(infile, nsamples=nsamples)
diff --git a/slither/tools/similarity/info.py b/slither/tools/similarity/info.py
index 95aadea6a..c9f9753d1 100644
--- a/slither/tools/similarity/info.py
+++ b/slither/tools/similarity/info.py
@@ -1,3 +1,4 @@
+import argparse
 import logging
 import sys
 import os.path
@@ -10,7 +11,7 @@ logging.basicConfig()
 logger = logging.getLogger("Slither-simil")
 
 
-def info(args):
+def info(args: argparse.Namespace) -> None:
 
     try:
 
diff --git a/slither/tools/similarity/plot.py b/slither/tools/similarity/plot.py
index bbdeec2cf..f11e92129 100644
--- a/slither/tools/similarity/plot.py
+++ b/slither/tools/similarity/plot.py
@@ -1,3 +1,4 @@
+import argparse
 import logging
 import random
 import sys
@@ -23,7 +24,7 @@ except ImportError:
 logger = logging.getLogger("Slither-simil")
 
 
-def plot(args):  # pylint: disable=too-many-locals
+def plot(args: argparse.Namespace) -> None:  # pylint: disable=too-many-locals
 
     if decomposition is None or plt is None:
         logger.error(
diff --git a/slither/tools/similarity/train.py b/slither/tools/similarity/train.py
index a0d06c944..ccadf4926 100755
--- a/slither/tools/similarity/train.py
+++ b/slither/tools/similarity/train.py
@@ -1,3 +1,4 @@
+import argparse
 import logging
 import os
 import sys
@@ -10,7 +11,7 @@ from slither.tools.similarity.model import train_unsupervised
 logger = logging.getLogger("Slither-simil")
 
 
-def train(args):  # pylint: disable=too-many-locals
+def train(args: argparse.Namespace) -> None:  # pylint: disable=too-many-locals
 
     try:
         last_data_train_filename = "last_data_train.txt"
diff --git a/slither/tools/slither_format/__main__.py b/slither/tools/slither_format/__main__.py
index a3d63d922..85c0a3917 100644
--- a/slither/tools/slither_format/__main__.py
+++ b/slither/tools/slither_format/__main__.py
@@ -23,7 +23,7 @@ available_detectors = [
 ]
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     """
     Parse the underlying arguments for the program.
     :return: Returns the arguments for the program.
@@ -90,7 +90,7 @@ def parse_args():
     return parser.parse_args()
 
 
-def main():
+def main() -> None:
     # ------------------------------
     #       Usage: python3 -m slither_format filename
     #       Example: python3 -m slither_format contract.sol
diff --git a/slither/tools/slither_format/slither_format.py b/slither/tools/slither_format/slither_format.py
index 794307100..c165b3fbb 100644
--- a/slither/tools/slither_format/slither_format.py
+++ b/slither/tools/slither_format/slither_format.py
@@ -1,5 +1,9 @@
 import logging
 from pathlib import Path
+from typing import Type, List, Dict
+
+from slither import Slither
+from slither.detectors.abstract_detector import AbstractDetector
 from slither.detectors.variables.unused_state_variables import UnusedStateVars
 from slither.detectors.attributes.incorrect_solc import IncorrectSolc
 from slither.detectors.attributes.constant_pragma import ConstantPragma
@@ -13,7 +17,7 @@ from slither.utils.colors import yellow
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger("Slither.Format")
 
-all_detectors = {
+all_detectors: Dict[str, Type[AbstractDetector]] = {
     "unused-state": UnusedStateVars,
     "solc-version": IncorrectSolc,
     "pragma": ConstantPragma,
@@ -25,7 +29,7 @@ all_detectors = {
 }
 
 
-def slither_format(slither, **kwargs):  # pylint: disable=too-many-locals
+def slither_format(slither: Slither, **kwargs: Dict) -> None:  # pylint: disable=too-many-locals
     """'
     Keyword Args:
         detectors_to_run (str): Comma-separated list of detectors, defaults to all
@@ -85,9 +89,11 @@ def slither_format(slither, **kwargs):  # pylint: disable=too-many-locals
 ###################################################################################
 
 
-def choose_detectors(detectors_to_run, detectors_to_exclude):
+def choose_detectors(
+    detectors_to_run: str, detectors_to_exclude: str
+) -> List[Type[AbstractDetector]]:
     # If detectors are specified, run only these ones
-    cls_detectors_to_run = []
+    cls_detectors_to_run: List[Type[AbstractDetector]] = []
     exclude = detectors_to_exclude.split(",")
     if detectors_to_run == "all":
         for key, detector in all_detectors.items():
@@ -114,7 +120,7 @@ def choose_detectors(detectors_to_run, detectors_to_exclude):
 ###################################################################################
 
 
-def print_patches(number_of_slither_results, patches):
+def print_patches(number_of_slither_results: int, patches: Dict) -> None:
     logger.info("Number of Slither results: " + str(number_of_slither_results))
     number_of_patches = 0
     for file in patches:
@@ -130,7 +136,7 @@ def print_patches(number_of_slither_results, patches):
             logger.info("Location end: " + str(patch["end"]))
 
 
-def print_patches_json(number_of_slither_results, patches):
+def print_patches_json(number_of_slither_results: int, patches: Dict) -> None:
     print("{", end="")
     print('"Number of Slither results":' + '"' + str(number_of_slither_results) + '",')
     print('"Number of patchlets":' + '"' + str(len(patches)) + '"', ",")
diff --git a/slither/tools/upgradeability/__main__.py b/slither/tools/upgradeability/__main__.py
index 6cc953015..d772029d0 100644
--- a/slither/tools/upgradeability/__main__.py
+++ b/slither/tools/upgradeability/__main__.py
@@ -3,10 +3,13 @@ import inspect
 import json
 import logging
 import sys
+from typing import List, Any, Type, Dict, Tuple, Union, Sequence, Optional
 
 from crytic_compile import cryticparser
 
+
 from slither import Slither
+from slither.core.declarations import Contract
 from slither.exceptions import SlitherException
 from slither.utils.colors import red
 from slither.utils.output import output_to_json
@@ -24,7 +27,7 @@ logger: logging.Logger = logging.getLogger("Slither")
 logger.setLevel(logging.INFO)
 
 
-def parse_args():
+def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
         description="Slither Upgradeability Checks. For usage information see https://github.com/crytic/slither/wiki/Upgradeability-Checks.",
         usage="slither-check-upgradeability contract.sol ContractName",
@@ -93,21 +96,27 @@ def parse_args():
 ###################################################################################
 
 
-def _get_checks():
-    detectors = [getattr(all_checks, name) for name in dir(all_checks)]
-    detectors = [c for c in detectors if inspect.isclass(c) and issubclass(c, AbstractCheck)]
+def _get_checks() -> List[Type[AbstractCheck]]:
+    detectors_ = [getattr(all_checks, name) for name in dir(all_checks)]
+    detectors: List[Type[AbstractCheck]] = [
+        c for c in detectors_ if inspect.isclass(c) and issubclass(c, AbstractCheck)
+    ]
     return detectors
 
 
 class ListDetectors(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, *args, **kwargs):  # pylint: disable=signature-differs
+    def __call__(
+        self, parser: Any, *args: Any, **kwargs: Any
+    ) -> None:  # pylint: disable=signature-differs
         checks = _get_checks()
         output_detectors(checks)
         parser.exit()
 
 
 class ListDetectorsJson(argparse.Action):  # pylint: disable=too-few-public-methods
-    def __call__(self, parser, *args, **kwargs):  # pylint: disable=signature-differs
+    def __call__(
+        self, parser: Any, *args: Any, **kwargs: Any
+    ) -> None:  # pylint: disable=signature-differs
         checks = _get_checks()
         detector_types_json = output_detectors_json(checks)
         print(json.dumps(detector_types_json))
@@ -116,48 +125,64 @@ class ListDetectorsJson(argparse.Action):  # pylint: disable=too-few-public-meth
 
 class OutputMarkdown(argparse.Action):  # pylint: disable=too-few-public-methods
     def __call__(
-        self, parser, args, values, option_string=None
-    ):  # pylint: disable=signature-differs
+        self,
+        parser: Any,
+        args: Any,
+        values: Optional[Union[str, Sequence[Any]]],
+        option_string: Any = None,
+    ) -> None:  # pylint: disable=signature-differs
         checks = _get_checks()
+        assert isinstance(values, str)
         output_to_markdown(checks, values)
         parser.exit()
 
 
 class OutputWiki(argparse.Action):  # pylint: disable=too-few-public-methods
     def __call__(
-        self, parser, args, values, option_string=None
-    ):  # pylint: disable=signature-differs
+        self,
+        parser: Any,
+        args: Any,
+        values: Optional[Union[str, Sequence[Any]]],
+        option_string: Any = None,
+    ) -> Any:  # pylint: disable=signature-differs
         checks = _get_checks()
+        assert isinstance(values, str)
         output_wiki(checks, values)
         parser.exit()
 
 
-def _run_checks(detectors):
-    results = [d.check() for d in detectors]
-    results = [r for r in results if r]
-    results = [item for sublist in results for item in sublist]  # flatten
+def _run_checks(detectors: List[AbstractCheck]) -> List[Dict]:
+    results_ = [d.check() for d in detectors]
+    results_ = [r for r in results_ if r]
+    results = [item for sublist in results_ for item in sublist]  # flatten
     return results
 
 
-def _checks_on_contract(detectors, contract):
-    detectors = [
+def _checks_on_contract(
+    detectors: List[Type[AbstractCheck]], contract: Contract
+) -> Tuple[List[Dict], int]:
+    detectors_ = [
         d(logger, contract)
         for d in detectors
         if (not d.REQUIRE_PROXY and not d.REQUIRE_CONTRACT_V2)
     ]
-    return _run_checks(detectors), len(detectors)
+    return _run_checks(detectors_), len(detectors)
 
 
-def _checks_on_contract_update(detectors, contract_v1, contract_v2):
-    detectors = [
+def _checks_on_contract_update(
+    detectors: List[Type[AbstractCheck]], contract_v1: Contract, contract_v2: Contract
+) -> Tuple[List[Dict], int]:
+    detectors_ = [
         d(logger, contract_v1, contract_v2=contract_v2) for d in detectors if d.REQUIRE_CONTRACT_V2
     ]
-    return _run_checks(detectors), len(detectors)
+    return _run_checks(detectors_), len(detectors)
 
 
-def _checks_on_contract_and_proxy(detectors, contract, proxy):
-    detectors = [d(logger, contract, proxy=proxy) for d in detectors if d.REQUIRE_PROXY]
-    return _run_checks(detectors), len(detectors)
+def _checks_on_contract_and_proxy(
+    detectors: List[Type[AbstractCheck]], contract: Contract, proxy: Contract
+) -> Tuple[List[Dict], int]:
+    detectors_ = [d(logger, contract, proxy=proxy) for d in detectors if d.REQUIRE_PROXY]
+    return _run_checks(detectors_), len(detectors)
 
 
 # endregion
@@ -168,8 +193,8 @@ def _checks_on_contract_and_proxy(detectors, contract, proxy):
 ###################################################################################
 
 # pylint: disable=too-many-statements,too-many-branches,too-many-locals
-def main():
-    json_results = {
+def main() -> None:
+    json_results: Dict = {
         "proxy-present": False,
         "contract_v2-present": False,
         "detectors": [],
diff --git a/slither/tools/upgradeability/utils/command_line.py b/slither/tools/upgradeability/utils/command_line.py
index 6ab3f82f9..88b61ceed 100644
--- a/slither/tools/upgradeability/utils/command_line.py
+++ b/slither/tools/upgradeability/utils/command_line.py
@@ -1,8 +1,10 @@
-from slither.tools.upgradeability.checks.abstract_checks import classification_txt
+from typing import List, Union, Dict, Type
+
+from slither.tools.upgradeability.checks.abstract_checks import classification_txt, AbstractCheck
 from slither.utils.myprettytable import MyPrettyTable
 
 
-def output_wiki(detector_classes, filter_wiki):
+def output_wiki(detector_classes: List[Type[AbstractCheck]], filter_wiki: str) -> None:
     # Sort by impact, confidence, and name
     detectors_list = sorted(
         detector_classes, key=lambda element: (element.IMPACT, element.ARGUMENT)
@@ -31,7 +33,7 @@ def output_wiki(detector_classes, filter_wiki):
         print(recommendation)
 
 
-def output_detectors(detector_classes):
+def output_detectors(detector_classes: List[Type[AbstractCheck]]) -> None:
     detectors_list = []
     for detector in detector_classes:
         argument = detector.ARGUMENT
@@ -48,7 +50,7 @@ def output_detectors(detector_classes):
     for (argument, help_info, impact, proxy, v2) in detectors_list:
         table.add_row(
             [
-                idx,
+                str(idx),
                 argument,
                 help_info,
                 classification_txt[impact],
@@ -60,8 +62,8 @@ def output_detectors(detector_classes):
     print(table)
 
 
-def output_to_markdown(detector_classes, _filter_wiki):
-    def extract_help(cls):
+def output_to_markdown(detector_classes: List[Type[AbstractCheck]], _filter_wiki: str) -> None:
+    def extract_help(cls: AbstractCheck) -> str:
         if cls.WIKI == "":
             return cls.HELP
         return f"[{cls.HELP}]({cls.WIKI})"
@@ -85,7 +87,9 @@ def output_to_markdown(detector_classes, _filter_wiki):
         idx = idx + 1
 
 
-def output_detectors_json(detector_classes):
+def output_detectors_json(
+    detector_classes: List[Type[AbstractCheck]],
+) -> List[Dict[str, Union[str, int]]]:
     detectors_list = []
     for detector in detector_classes:
         argument = detector.ARGUMENT
@@ -110,7 +114,7 @@ def output_detectors_json(detector_classes):
     # Sort by impact, confidence, and name
     detectors_list = sorted(detectors_list, key=lambda element: (element[2], element[0]))
     idx = 1
-    table = []
+    table: List[Dict[str, Union[str, int]]] = []
     for (
         argument,
         help_info,
diff --git a/slither/utils/command_line.py b/slither/utils/command_line.py
index d264e65ea..c2fef5eca 100644
--- a/slither/utils/command_line.py
+++ b/slither/utils/command_line.py
@@ -1,13 +1,17 @@
+import argparse
 import json
 import os
 import re
 import logging
 from collections import defaultdict
+from typing import Dict, List, Type, Union
+
 from crytic_compile.cryticparser.defaults import (
     DEFAULTS_FLAG_IN_CONFIG as DEFAULTS_FLAG_IN_CONFIG_CRYTIC_COMPILE,
 )
 
-from slither.detectors.abstract_detector import classification_txt
+from slither.detectors.abstract_detector import classification_txt, AbstractDetector
+from slither.printers.abstract_printer import AbstractPrinter
 from slither.utils.colors import yellow, red
 from slither.utils.myprettytable import MyPrettyTable
 
@@ -54,7 +58,7 @@ defaults_flag_in_config = {
 }
 
 
-def read_config_file(args):
+def read_config_file(args: argparse.Namespace) -> None:
     # No config file was provided as an argument
     if args.config_file is None:
         # Check wether the default config file is present
@@ -83,8 +87,12 @@ def read_config_file(args):
         logger.error(yellow("Falling back to the default settings..."))
 
 
-def output_to_markdown(detector_classes, printer_classes, filter_wiki):
-    def extract_help(cls):
+def output_to_markdown(
+    detector_classes: List[Type[AbstractDetector]],
+    printer_classes: List[Type[AbstractPrinter]],
+    filter_wiki: str,
+) -> None:
+    def extract_help(cls: Union[Type[AbstractDetector], Type[AbstractPrinter]]) -> str:
         if cls.WIKI == "":
             return cls.HELP
         return f"[{cls.HELP}]({cls.WIKI})"
@@ -127,7 +135,7 @@ def output_to_markdown(detector_classes, printer_classes, filter_wiki):
         idx = idx + 1
 
 
-def get_level(l):
+def get_level(l: str) -> int:
     tab = l.count("\t") + 1
     if l.replace("\t", "").startswith(" -"):
         tab = tab + 1
@@ -136,7 +144,7 @@ def get_level(l):
     return tab
 
 
-def convert_result_to_markdown(txt):
+def convert_result_to_markdown(txt: str) -> str:
     # -1 to remove the last \n
     lines = txt[0:-1].split("\n")
     ret = []
@@ -154,16 +162,21 @@ def convert_result_to_markdown(txt):
     return "".join(ret)
 
 
-def output_results_to_markdown(all_results, checklistlimit: str):
+def output_results_to_markdown(all_results: List[Dict], checklistlimit: str) -> None:
     checks = defaultdict(list)
-    info = defaultdict(dict)
-    for results in all_results:
-        checks[results["check"]].append(results)
-        info[results["check"]] = {"impact": results["impact"], "confidence": results["confidence"]}
+    info: Dict = defaultdict(dict)
+    for results_ in all_results:
+        checks[results_["check"]].append(results_)
+        info[results_["check"]] = {
+            "impact": results_["impact"],
+            "confidence": results_["confidence"],
+        }
 
     print("Summary")
-    for check in checks:
-        print(f" - [{check}](#{check}) ({len(checks[check])} results) ({info[check]['impact']})")
+    for check_ in checks:
+        print(
+            f" - [{check_}](#{check_}) ({len(checks[check_])} results) ({info[check_]['impact']})"
+        )
 
     counter = 0
     for (check, results) in checks.items():
@@ -185,8 +198,7 @@ def output_results_to_markdown(all_results, checklistlimit: str):
             print(f"**More results were found, check [{checklistlimit}]({checklistlimit})**")
 
 
-def output_wiki(detector_classes, filter_wiki):
-    detectors_list = []
+def output_wiki(detector_classes: List[Type[AbstractDetector]], filter_wiki: str) -> None:
 
     # Sort by impact, confidence, and name
     detectors_list = sorted(
@@ -223,7 +235,7 @@ def output_wiki(detector_classes, filter_wiki):
         print(recommendation)
 
 
-def output_detectors(detector_classes):
+def output_detectors(detector_classes: List[Type[AbstractDetector]]) -> None:
     detectors_list = []
     for detector in detector_classes:
         argument = detector.ARGUMENT
@@ -242,12 +254,15 @@ def output_detectors(detector_classes):
     )
     idx = 1
     for (argument, help_info, impact, confidence) in detectors_list:
-        table.add_row([idx, argument, help_info, classification_txt[impact], confidence])
+        table.add_row([str(idx), argument, help_info, classification_txt[impact], confidence])
         idx = idx + 1
     print(table)
 
 
-def output_detectors_json(detector_classes):  # pylint: disable=too-many-locals
+# pylint: disable=too-many-locals
+def output_detectors_json(
+    detector_classes: List[Type[AbstractDetector]],
+) -> List[Dict]:
     detectors_list = []
     for detector in detector_classes:
         argument = detector.ARGUMENT
@@ -307,7 +322,7 @@ def output_detectors_json(detector_classes):  # pylint: disable=too-many-locals
     return table
 
 
-def output_printers(printer_classes):
+def output_printers(printer_classes: List[Type[AbstractPrinter]]) -> None:
     printers_list = []
     for printer in printer_classes:
         argument = printer.ARGUMENT
@@ -319,12 +334,12 @@ def output_printers(printer_classes):
     printers_list = sorted(printers_list, key=lambda element: (element[0]))
     idx = 1
     for (argument, help_info) in printers_list:
-        table.add_row([idx, argument, help_info])
+        table.add_row([str(idx), argument, help_info])
         idx = idx + 1
     print(table)
 
 
-def output_printers_json(printer_classes):
+def output_printers_json(printer_classes: List[Type[AbstractPrinter]]) -> List[Dict]:
     printers_list = []
     for printer in printer_classes:
         argument = printer.ARGUMENT
diff --git a/slither/utils/output.py b/slither/utils/output.py
index 6296e35d3..5db6492db 100644
--- a/slither/utils/output.py
+++ b/slither/utils/output.py
@@ -4,7 +4,7 @@ import json
 import logging
 import zipfile
 from collections import OrderedDict
-from typing import Optional, Dict, List, Union, Any, TYPE_CHECKING
+from typing import Optional, Dict, List, Union, Any, TYPE_CHECKING, Type
 from zipfile import ZipFile
 from pkg_resources import require
 
@@ -129,7 +129,7 @@ def _output_result_to_sarif(
 
 
 def output_to_sarif(
-    filename: Optional[str], results: Dict, detectors_classes: List["AbstractDetector"]
+    filename: Optional[str], results: Dict, detectors_classes: List[Type["AbstractDetector"]]
 ) -> None:
     """
 
diff --git a/slither/utils/output_capture.py b/slither/utils/output_capture.py
index 5282afb91..aec170d7f 100644
--- a/slither/utils/output_capture.py
+++ b/slither/utils/output_capture.py
@@ -28,7 +28,7 @@ class StandardOutputCapture:
     original_logger_handlers = None
 
     @staticmethod
-    def enable(block_original=True):
+    def enable(block_original: bool = True) -> None:
         """
         Redirects stdout and stderr to a capturable StringIO.
         :param block_original: If True, blocks all output to the original stream. If False, duplicates output.
@@ -54,7 +54,7 @@ class StandardOutputCapture:
             root_logger.handlers = [logging.StreamHandler(sys.stderr)]
 
     @staticmethod
-    def disable():
+    def disable() -> None:
         """
         Disables redirection of stdout/stderr, if previously enabled.
         :return: None
@@ -78,7 +78,7 @@ class StandardOutputCapture:
             StandardOutputCapture.original_logger_handlers = None
 
     @staticmethod
-    def get_stdout_output():
+    def get_stdout_output() -> str:
         """
         Obtains the output from the currently set stdout
         :return: Returns stdout output as a string
@@ -87,7 +87,7 @@ class StandardOutputCapture:
         return sys.stdout.read()
 
     @staticmethod
-    def get_stderr_output():
+    def get_stderr_output() -> str:
         """
         Obtains the output from the currently set stderr
         :return: Returns stderr output as a string