Refactor to enforce strictNullChecks

This commit applies `strictNullChecks` to the entire codebase to improve
maintainability and type safety. Key changes include:

- Remove some explicit null-checks where unnecessary.
- Add necessary null-checks.
- Refactor static factory functions for a more functional approach.
- Improve some test names and contexts for better debugging.
- Add unit tests for any additional logic introduced.
- Refactor `createPositionFromRegexFullMatch` to its own function as the
  logic is reused.
- Prefer `find` prefix on functions that may return `undefined` and
  `get` prefix for those that always return a value.

tests/integration/infrastructure/RuntimeSanity/SanityChecks.spec.ts

@@ -28,7 +28,11 @@ function generateTestOptions(): ISanityCheckOptions[] {
   return generateBooleanPermutations(defaultOptions);
 }
 
-function generateBooleanPermutations<T>(object: T): T[] {
+function generateBooleanPermutations<T>(object: T | undefined): T[] {
+  if (!object) {
+    return [];
+  }
+
   const keys = Object.keys(object) as (keyof T)[];
 
   if (keys.length === 0) {
@@ -47,7 +51,7 @@ function generateBooleanPermutations<T>(object: T): T[] {
 
   const remainingKeys = Object.fromEntries(
     keys.slice(1).map((key) => [key, object[key]]),
-  ) as unknown as T;
+  ) as unknown as T | undefined;
 
   const subPermutations = generateBooleanPermutations(remainingKeys);
 

tests/integration/infrastructure/RuntimeSanity/Validators/ValidatorTestRunner.ts

@@ -4,9 +4,6 @@ import { ISanityValidator } from '@/infrastructure/RuntimeSanity/Common/ISanityV
 export function itNoErrorsOnCurrentEnvironment(
   factory: () => ISanityValidator,
 ) {
-  if (!factory) {
-    throw new Error('missing factory');
-  }
   it('it does report errors on current environment', () => {
     // arrange
     const validator = factory();

tests/integration/presentation/electron/preload/WindowVariablesProvider.spec.ts

@@ -23,7 +23,7 @@ function checkAllowedType(value: unknown) {
   if (Array.isArray(value)) {
     return value.every(checkAllowedType);
   }
-  if (type === 'object' && value !== null) {
+  if (type === 'object' && value !== null && value !== undefined) {
     return (
       // Every key should be a string
       Object.keys(value).every((key) => typeof key === 'string')