First check-in of the code from the Obsidian Prj project.

src/functions/Register.ts

@@ -0,0 +1,35 @@
+import { DIContainer } from 'src/DIContainer';
+
+/**
+ * Register a dependency.
+ * @param identifier The identifier of the dependency.
+ * @param dependency The dependency to register.
+ */
+export function Register<T>(identifier: string, dependency: T): void;
+
+/**
+ * Register a dependency.
+ * @param identifier The identifier of the dependency.
+ * @param dependency The dependency to register.
+ * @param deprecated A warning is logged when the dependency is resolved.
+ */
+export function Register<T>(
+    identifier: string,
+    dependency: T,
+    deprecated?: true,
+): void;
+
+/**
+ * Register a dependency.
+ * @param identifier The identifier of the dependency.
+ * @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,
+    dependency: T,
+    deprecated?: boolean,
+): void {
+    DIContainer.getInstance().register(identifier, dependency, deprecated);
+}

src/functions/Resolve.ts

@@ -0,0 +1,33 @@
+import { DIContainer } from '../DIContainer';
+import { DependencyResolutionError } from '../interfaces/Exceptions';
+
+/**
+ * Resolve a dependency.
+ * @param identifier The identifier of the dependency.
+ * @returns The resolved dependency.
+ * @throws A {@link DependencyResolutionError} if the dependency is not found.
+ */
+export function Resolve<T>(identifier: string): T;
+
+/**
+ * Resolve a dependency
+ * @param identifier The identifier of the dependency.
+ * @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;
+
+/**
+ * Resolve a dependency.
+ * @param identifier The identifier of the dependency.
+ * @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,
+    necessary?: boolean,
+): T | undefined {
+    return DIContainer.getInstance().resolve<T>(identifier, necessary);
+}