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/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/TreeInputParser.spec.ts

@@ -3,7 +3,6 @@ import { parseTreeInput } from '@/presentation/components/Scripts/View/Tree/Tree
 import { TreeInputNodeData } from '@/presentation/components/Scripts/View/Tree/TreeView/Bindings/TreeInputNodeData';
 import { TreeNodeManager } from '@/presentation/components/Scripts/View/Tree/TreeView/Node/TreeNodeManager';
 import { TreeInputNodeDataStub } from '@tests/unit/shared/Stubs/TreeInputNodeDataStub';
-import { itEachAbsentObjectValue } from '@tests/unit/shared/TestCases/AbsentTests';
 
 describe('parseTreeInput', () => {
   it('throws if input data is not an array', () => {
@@ -16,18 +15,6 @@ describe('parseTreeInput', () => {
     expect(act).to.throw(expectedError);
   });
 
-  describe('throws if input data is absent', () => {
-    itEachAbsentObjectValue((absentValue) => {
-      // arrange
-      const expectedError = 'missing input';
-      const invalidInput = absentValue;
-      // act
-      const act = () => parseTreeInput(invalidInput);
-      // assert
-      expect(act).to.throw(expectedError);
-    });
-  });
-
   it('returns an empty array if given an empty array', () => {
     // arrange
     const input = [];

tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/TreeNodeInitializerAndUpdater.spec.ts

@@ -6,11 +6,12 @@ import { createTreeNodeParserStub } from '@tests/unit/shared/Stubs/TreeNodeParse
 import { TreeNodeStub } from '@tests/unit/shared/Stubs/TreeNodeStub';
 import { TreeInputNodeDataStub } from '@tests/unit/shared/Stubs/TreeInputNodeDataStub';
 import { QueryableNodes } from '@/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/Query/QueryableNodes';
+import { TreeInputNodeData } from '@/presentation/components/Scripts/View/Tree/TreeView/Bindings/TreeInputNodeData';
 
 describe('TreeNodeInitializerAndUpdater', () => {
   describe('updateRootNodes', () => {
     it('should throw an error if no data is provided', () => {
-      itEachAbsentCollectionValue((absentValue) => {
+      itEachAbsentCollectionValue<TreeInputNodeData>((absentValue) => {
         // arrange
         const expectedError = 'missing data';
         const initializer = new TreeNodeInitializerAndUpdaterBuilder()
@@ -19,7 +20,7 @@ describe('TreeNodeInitializerAndUpdater', () => {
         const act = () => initializer.updateRootNodes(absentValue);
         // expect
         expect(act).to.throw(expectedError);
-      });
+      }, { excludeUndefined: true, excludeNull: true });
     });
 
     it('should update nodes when valid data is provided', () => {