Refactor DI container for better structure and clarity

- Moved `TSinjex` class to `classes` directory for better organization.
- Updated imports across the codebase to reflect the new location of `TSinjex`.
- Introduced `Identifier` type to standardize dependency identifiers.
- Enhanced JSDoc comments for improved clarity and consistency.
- Adjusted error messages for `DependencyResolutionError` to provide clearer information.
- Updated and expanded decorator and function types to use `Identifier` type.

src/functions/register.ts

@@ -1,33 +1,37 @@
-import { TSinjex } from '../TSinjex';
+import { Identifier } from 'src/types/Identifier';
+import { TSinjex } from '../classes/TSinjex';
 
 /**
  * Register a dependency.
- * @param identifier The identifier of the dependency.
+ * @param identifier The identifier used to register the class in the DI container.
+ * @see {@link Identifier} for more information on identifiers..
  * @param dependency The dependency to register.
  */
-export function register<T>(identifier: string, dependency: T): void;
+export function register<T>(identifier: Identifier, dependency: T): void;
 
 /**
  * Register a dependency.
- * @param identifier The identifier of the dependency.
+ * @param identifier The identifier used to register the class in the DI container.
+ * @see {@link Identifier} for more information on identifiers.
  * @param dependency The dependency to register.
  * @param deprecated A warning is logged when the dependency is resolved.
  */
 export function register<T>(
-    identifier: string,
+    identifier: Identifier,
     dependency: T,
     deprecated?: true,
 ): void;
 
 /**
  * Register a dependency.
- * @param identifier The identifier of the dependency.
+ * @param identifier The identifier used to register the class in the DI container.
+ * @see {@link Identifier} for more information on identifiers.
  * @param dependency The dependency to register.
  * @param deprecated If true, the dependency is deprecated => a warning
  * is logged when the dependency is resolved.
  */
 export function register<T>(
-    identifier: string,
+    identifier: Identifier,
     dependency: T,
     deprecated?: boolean,
 ): void {

src/functions/resolve.ts

@@ -1,32 +1,39 @@
+import { Identifier } from 'src/types/Identifier';
+import { TSinjex } from '../classes/TSinjex';
 import { DependencyResolutionError } from '../interfaces/Exceptions';
-import { TSinjex } from '../TSinjex';
 
 /**
  * Resolve a dependency.
- * @param identifier The identifier of the dependency.
+ * @param identifier The identifier used to register the class in the DI container.
+ * @see {@link Identifier} for more information on identifiers.
  * @returns The resolved dependency.
  * @throws A {@link DependencyResolutionError} if the dependency is not found.
  */
-export function resolve<T>(identifier: string): T;
+export function resolve<T>(identifier: Identifier): T;
 
 /**
  * Resolve a dependency
- * @param identifier The identifier of the dependency.
+ * @param identifier The identifier used to register the class in the DI container.
+ * @see {@link Identifier} for more information on identifiers.
  * @param necessary The dependency is **not** necessary.
  * @returns The resolved dependency or undefined if the dependency is not found.
  */
-export function resolve<T>(identifier: string, necessary: false): T | undefined;
+export function resolve<T>(
+    identifier: Identifier,
+    necessary: false,
+): T | undefined;
 
 /**
  * Resolve a dependency.
- * @param identifier The identifier of the dependency.
+ * @param identifier The identifier used to register the class in the DI container.
+ * @see {@link Identifier} for more information on identifiers.
  * @param necessary If true, throws an error if the dependency is not found.
  * @returns The resolved dependency or undefined if the dependency is not necessary
  * and not found, or throws an error if the dependency is necessary and not found.
  * @throws A {@link DependencyResolutionError} if the dependency is not found and necessary.
  */
 export function resolve<T>(
-    identifier: string,
+    identifier: Identifier,
     necessary?: boolean,
 ): T | undefined {
     return TSinjex.getInstance().resolve<T>(identifier, necessary);