diff --git a/pmb/helpers/apk.py b/pmb/helpers/apk.py
index 29bf1c81..858ad975 100644
--- a/pmb/helpers/apk.py
+++ b/pmb/helpers/apk.py
@@ -102,7 +102,7 @@ def _prepare_fifo() -> Path:
     return fifo
 
 
-def _create_command_with_progress(command, fifo):
+def _create_command_with_progress(command: list[str], fifo: Path) -> list[str]:
     """Build a full apk command from a subcommand, set up to redirect progress into a fifo.
 
     :param command: apk subcommand in list form
@@ -132,7 +132,7 @@ def _compute_progress(line: str) -> float:
     return cur / tot if tot > 0 else 0
 
 
-def _apk_with_progress(command: Sequence[str]) -> None:
+def _apk_with_progress(command: list[str]) -> None:
     """Run an apk subcommand while printing a progress bar to STDOUT.
 
     :param command: apk subcommand in list form
diff --git a/pmb/helpers/apk_static.py b/pmb/helpers/apk_static.py
index 6bc4115d..c31fc4cc 100644
--- a/pmb/helpers/apk_static.py
+++ b/pmb/helpers/apk_static.py
@@ -55,7 +55,7 @@ def read_signature_info(tar: tarfile.TarFile) -> tuple[str, str]:
     return (sigfilename, sigkey_path)
 
 
-def extract_temp(tar, sigfilename):
+def extract_temp(tar: tarfile.TarFile, sigfilename: str) -> dict[str, dict]:
     """
     Extract apk.static and signature as temporary files.
     """
@@ -64,19 +64,25 @@ def extract_temp(tar, sigfilename):
         "sig": {"filename": sigfilename, "temp_path": None},
     }
     for ftype in ret.keys():
-        member = tar.getmember(ret[ftype]["filename"])
+        filename = ret[ftype]["filename"]
+        if filename is None:
+            raise AssertionError
+        member = tar.getmember(filename)
 
         fd, path = tempfile.mkstemp(ftype, "pmbootstrap")
         handle = open(fd, "wb")
         ret[ftype]["temp_path"] = path
-        shutil.copyfileobj(tar.extractfile(member), handle)
+        extracted_file = tar.extractfile(member)
+        if extracted_file is None:
+            raise AssertionError
+        shutil.copyfileobj(extracted_file, handle)
 
         logging.debug(f"extracted: {path}")
         handle.close()
     return ret
 
 
-def verify_signature(files, sigkey_path):
+def verify_signature(files: dict[str, dict], sigkey_path: str) -> None:
     """
     Verify the signature with openssl.
 
diff --git a/pmb/helpers/pmaports.py b/pmb/helpers/pmaports.py
index d2621927..f95fcb73 100644
--- a/pmb/helpers/pmaports.py
+++ b/pmb/helpers/pmaports.py
@@ -188,8 +188,31 @@ def show_pkg_not_found_systemd_hint(package: str, with_extra_repos: WithExtraRep
         )
 
 
+@overload
+def find(
+    package: str,
+    must_exist: Literal[True] = ...,
+    subpackages: bool = ...,
+    with_extra_repos: WithExtraRepos = ...,
+) -> Path: ...
+
+
+@overload
+def find(
+    package: str,
+    must_exist: bool = ...,
+    subpackages: bool = ...,
+    with_extra_repos: WithExtraRepos = ...,
+) -> Path | None: ...
+
+
 @Cache("package", "subpackages", "with_extra_repos")
-def find(package, must_exist=True, subpackages=True, with_extra_repos="default"):
+def find(
+    package: str,
+    must_exist: bool = True,
+    subpackages: bool = True,
+    with_extra_repos: WithExtraRepos = "default",
+) -> Path | None:
     """Find the directory in pmaports that provides a package or subpackage.
     If you want the parsed APKBUILD instead, use pmb.helpers.pmaports.get().
 
diff --git a/pmb/helpers/run_core.py b/pmb/helpers/run_core.py
index ab8a8d94..7f0ab696 100644
--- a/pmb/helpers/run_core.py
+++ b/pmb/helpers/run_core.py
@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 import fcntl
 from pmb.core.context import get_context
-from pmb.types import PathString, Env, RunOutputType
+from pmb.types import PathString, Env, RunOutputType, RunReturnType
 from pmb.helpers import logging
 import os
 from pathlib import Path
@@ -72,7 +72,9 @@ def sanity_checks(
         raise RuntimeError("Can't use output_return with output: " + output)
 
 
-def background(cmd: str, working_dir: PathString | None = None) -> subprocess.Popen:
+def background(
+    cmd: PathString | Sequence[PathString], working_dir: PathString | None = None
+) -> subprocess.Popen:
     """Run a subprocess in background and redirect its output to the log."""
     ret = subprocess.Popen(
         cmd, stdout=pmb.helpers.logging.logfd, stderr=pmb.helpers.logging.logfd, cwd=working_dir
@@ -81,7 +83,9 @@ def background(cmd: str, working_dir: PathString | None = None) -> subprocess.Po
     return ret
 
 
-def pipe(cmd: str, working_dir: PathString | None = None) -> subprocess.Popen:
+def pipe(
+    cmd: PathString | Sequence[PathString], working_dir: PathString | None = None
+) -> subprocess.Popen:
     """Run a subprocess in background and redirect its output to a pipe."""
     ret = subprocess.Popen(
         cmd,
@@ -114,6 +118,16 @@ def pipe_read(
 ) -> None: ...
 
 
+@overload
+def pipe_read(
+    process: subprocess.Popen,
+    output_to_stdout: bool = ...,
+    output_log: bool = ...,
+    output_return: bool = ...,
+    output_return_buffer: list[bytes] | None = ...,
+) -> None: ...
+
+
 def pipe_read(
     process: subprocess.Popen,
     output_to_stdout: bool = False,
@@ -195,15 +209,15 @@ def kill_command(pid: int, sudo: bool) -> None:
 
 
 def foreground_pipe(
-    cmd,
-    working_dir=None,
-    output_to_stdout=False,
-    output_return=False,
-    output_log=True,
-    output_timeout=True,
-    sudo=False,
-    stdin=None,
-):
+    cmd: PathString | Sequence[PathString],
+    working_dir: Path | None = None,
+    output_to_stdout: bool = False,
+    output_return: bool = False,
+    output_log: bool = True,
+    output_timeout: bool = True,
+    sudo: bool = False,
+    stdin: int | None = None,
+) -> tuple[int, str]:
     """Run a subprocess in foreground with redirected output.
 
     Optionally kill it after being silent for too long.
@@ -270,7 +284,9 @@ def foreground_pipe(
     return (process.returncode, b"".join(output_buffer).decode("utf-8"))
 
 
-def foreground_tui(cmd: str, working_dir: PathString | None = None) -> int:
+def foreground_tui(
+    cmd: PathString | Sequence[PathString], working_dir: PathString | None = None
+) -> int:
     """Run a subprocess in foreground without redirecting any of its output.
 
     This is the only way text-based user interfaces (ncurses programs like
@@ -342,15 +358,15 @@ def add_proxy_env_vars(env: Env) -> None:
 
 
 def core(
-    log_message,
-    cmd,
-    working_dir=None,
-    output="log",
-    output_return=False,
-    check=None,
-    sudo=False,
-    disable_timeout=False,
-):
+    log_message: str,
+    cmd: Sequence[PathString],
+    working_dir: Path | None = None,
+    output: RunOutputType = "log",
+    output_return: bool = False,
+    check: bool | None = None,
+    sudo: bool = False,
+    disable_timeout: bool = False,
+) -> RunReturnType:
     """Run a command and create a log entry.
 
     This is a low level function not meant to be used directly. Use one of the
diff --git a/pmb/parse/arguments.py b/pmb/parse/arguments.py
index f9bb2789..4abbe311 100644
--- a/pmb/parse/arguments.py
+++ b/pmb/parse/arguments.py
@@ -1,10 +1,11 @@
 # Copyright 2023 Oliver Smith
 # SPDX-License-Identifier: GPL-3.0-or-later
 import argparse
+from collections.abc import Sequence
 import os
 from pathlib import Path
 import sys
-from typing import cast
+from typing import Any, cast
 
 from pmb.core.arch import Arch
 from pmb.core import Config
@@ -45,10 +46,16 @@ def toggle_other_boolean_flags(
     """
 
     class SetOtherDestinationsAction(argparse.Action):
-        def __init__(self, option_strings, dest, **kwargs):
+        def __init__(self, option_strings: list[str], dest: str, **kwargs: Any) -> None:
             super().__init__(option_strings, dest, nargs=0, const=value, default=value, **kwargs)
 
-        def __call__(self, parser, namespace, values, option_string=None):
+        def __call__(
+            self,
+            parser: argparse.ArgumentParser,
+            namespace: argparse.Namespace,
+            values: str | Sequence[Any] | None,
+            option_string: str | None = None,
+        ) -> None:
             for destination in other_destinations:
                 setattr(namespace, destination, value)
 
@@ -720,7 +727,7 @@ def arguments_kconfig(subparser: argparse._SubParsersAction) -> None:
     add_kernel_arg(migrate, nargs=1)
 
 
-def arguments_repo_bootstrap(subparser):
+def arguments_repo_bootstrap(subparser: argparse._SubParsersAction) -> argparse.ArgumentParser:
     arch_choices = Arch.supported()
 
     ret = subparser.add_parser("repo_bootstrap")
@@ -792,16 +799,26 @@ def arguments_ci(subparser: argparse._SubParsersAction) -> argparse.ArgumentPars
     return ret
 
 
-def package_completer(prefix, action, parser=None, parsed_args=None):
+def package_completer(
+    prefix: str,
+    action: str,
+    parser: argparse.ArgumentParser | None = None,
+    parsed_args: list[str] | None = None,
+) -> set[str]:
     packages = set(
         package for package in pmb.helpers.pmaports.get_list() if package.startswith(prefix)
     )
     return packages
 
 
-def kernel_completer(prefix, action, parser=None, parsed_args=None):
+def kernel_completer(
+    prefix: str,
+    action: str,
+    parser: argparse.ArgumentParser | None = None,
+    parsed_args: list[str] | None = None,
+) -> list[str]:
     """:returns: matched linux-* packages, with linux-* prefix and without"""
-    ret = []
+    ret: list[str] = []
 
     # Full package name, starting with "linux-"
     if len("linux-") < len(prefix) and prefix.startswith("linux-") or "linux-".startswith(prefix):
@@ -814,7 +831,9 @@ def kernel_completer(prefix, action, parser=None, parsed_args=None):
     return ret
 
 
-def add_packages_arg(subparser, name="packages", *args, **kwargs):
+def add_packages_arg(
+    subparser: argparse.ArgumentParser, name: str = "packages", *args: str, **kwargs: Any
+) -> None:
     arg = subparser.add_argument(name, *args, **kwargs)
     if "argcomplete" in sys.modules:
         arg.completer = package_completer  # type: ignore[attr-defined]
diff --git a/pmb/parse/version.py b/pmb/parse/version.py
index 44a6a08e..ea8a59f6 100644
--- a/pmb/parse/version.py
+++ b/pmb/parse/version.py
@@ -129,7 +129,7 @@ def parse_suffix(rest: str) -> tuple[str, int, bool]:
     return (rest, 0, True)
 
 
-def get_token(previous, rest):
+def get_token(previous: str, rest: str) -> tuple[str, int, str]:
     """
     This function does three things:
     * get the next token