diff --git a/.github/workflows/pyright.yaml b/.github/workflows/pyright.yaml
new file mode 100644
index 0000000000..a717559ec5
--- /dev/null
+++ b/.github/workflows/pyright.yaml
@@ -0,0 +1,24 @@
+on: [ push, pull_request ]
+name: Pyright type checking
+jobs:
+    pyright:
+        runs-on: ubuntu-latest
+        container:
+            image: archlinux/archlinux:latest
+        steps:
+            - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+            - name: Prepare arch
+              run: |
+                pacman-key --init
+                pacman --noconfirm -Sy archlinux-keyring
+                pacman --noconfirm -Syyu
+                pacman --noconfirm -Sy python-pip python-pyparted pkgconfig gcc nodejs npm
+            - run: pip install --break-system-packages --upgrade pip
+            - name: Install Python dependencies
+              run: pip install --break-system-packages .[dev]
+            - name: Install Node.js dependencies
+              run: npm install
+            - name: Display Pyright version
+              run: npx --no -- pyright --version
+            - name: Run Pyright
+              run: npx --no -- pyright
diff --git a/.gitignore b/.gitignore
index 9e30144f3b..376bdbd535 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,4 +39,5 @@ requirements.txt
 /.gitconfig
 /actions-runner
 /cmd_output.txt
+node_modules/
 uv.lock
diff --git a/archinstall/lib/models/device.py b/archinstall/lib/models/device.py
index 7dc940392e..fb056d0db6 100644
--- a/archinstall/lib/models/device.py
+++ b/archinstall/lib/models/device.py
@@ -317,10 +317,6 @@ class Size:
 	unit: Unit
 	sector_size: SectorSize
 
-	def __post_init__(self) -> None:
-		if not isinstance(self.sector_size, SectorSize):
-			raise ValueError('sector size must be of type SectorSize')
-
 	def json(self) -> _SizeSerialization:
 		return {
 			'value': self.value,
@@ -352,7 +348,9 @@ def convert(
 			norm = self._normalize()
 			return Size(norm, Unit.B, self.sector_size).convert(target_unit, sector_size)
 		else:
-			if target_unit == Unit.sectors and sector_size is not None:
+			if target_unit == Unit.sectors:
+				assert sector_size is not None
+
 				norm = self._normalize()
 				sectors = math.ceil(norm / sector_size.value)
 				return Size(sectors, Unit.sectors, sector_size)
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000000..23122e3f35
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,44 @@
+{
+  "name": "archinstall",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "devDependencies": {
+        "pyright": "1.1.405"
+      }
+    },
+    "node_modules/fsevents": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
+      "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
+    "node_modules/pyright": {
+      "version": "1.1.405",
+      "resolved": "https://registry.npmjs.org/pyright/-/pyright-1.1.405.tgz",
+      "integrity": "sha512-hgy12kLZ1oAMtl9LTsByHftg3AD6Pouwu5rBsQlqYQqCCdGBgaQm9XDAPDap7ayWe9W+NWrUwO7Zy1K7uXoE2A==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "pyright": "index.js",
+        "pyright-langserver": "langserver.index.js"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000000..5b45d5b650
--- /dev/null
+++ b/package.json
@@ -0,0 +1,5 @@
+{
+  "devDependencies": {
+    "pyright": "1.1.405"
+  }
+}
diff --git a/pyproject.toml b/pyproject.toml
index 40e6a3cb92..dc8d45f977 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -136,6 +136,7 @@ testpaths = ["tests"]
 ignore-paths = [
     "^build/",
     "^docs/",
+    "^node_modules/",
 ]
 load-plugins = ["pylint_pydantic"]
 persistent = false
@@ -230,3 +231,30 @@ ignore = [
 
 [tool.ruff.lint.mccabe]
 max-complexity = 40
+
+[tool.pyright]
+pythonVersion = "3.12"
+typeCheckingMode = "strict"
+exclude = [
+    "**/node_modules",
+    "**/__pycache__",
+    "**/.*",
+    "build/",
+]
+reportArgumentType = false
+reportAttributeAccessIssue = false
+reportMatchNotExhaustive = false
+reportMissingTypeStubs = false
+reportPrivateUsage = false
+reportTypedDictNotRequiredAccess = false
+reportUnknownArgumentType = false
+reportUnknownLambdaType = false
+reportUnknownMemberType = false
+reportUnknownVariableType = false
+reportUnnecessaryComparison = false
+
+# Additional flags that are not included in strict mode
+deprecateTypingAliases = true
+reportImplicitOverride = true
+reportImportCycles = false
+reportPropertyTypeMismatch = true