Import other modules into monorepo

src/di/factory/SingletonFactory.ts

@@ -0,0 +1,54 @@
+import { Factory } from './Factory'
+import { Collection } from '../../util'
+import {DependencyRequirement, PropertyDependency} from "../types";
+
+/**
+ * Container factory which returns its token as its value, without attempting
+ * to instantiate anything. This is used to register already-produced-singletons
+ * with the container.
+ *
+ * @example
+ * ```typescript
+ * class A {}
+ * const exactlyThisInstanceOfA = new A()
+ *
+ * const fact = new SingletonFactory(A, a)
+ *
+ * fact.produce([], [])  // => exactlyThisInstanceOfA
+ * ```
+ *
+ * @extends Factory
+ */
+export default class SingletonFactory extends Factory {
+    constructor(
+        /**
+         * Instantiated value of this factory.
+         * @type FunctionConstructor
+         */
+        protected token: FunctionConstructor,
+
+        /**
+         * String name of this singleton identifying it in the container.
+         * @type string
+         */
+        protected key: string,
+    ) {
+        super(token)
+    }
+
+    produce(dependencies: any[], parameters: any[]) {
+        return this.token
+    }
+
+    match(something: any) {
+        return something === this.key
+    }
+
+    getDependencyKeys(): Collection<DependencyRequirement> {
+        return new Collection<DependencyRequirement>()
+    }
+
+    getInjectedProperties(): Collection<PropertyDependency> {
+        return new Collection<PropertyDependency>()
+    }
+}