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src/core/ioc.ts

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+import type { IntoDependencies } from '../types/ioc';
+import { Service as $Service, Services as $Services } from '@sern/ioc/global'
+import { Container } from '@sern/ioc';
+import * as  __Services from './structures/default-services';
+import type { Logging } from './interfaces';
+import { __init_container, useContainerRaw } from '@sern/ioc/global';
+import { EventEmitter } from 'node:events';
+
+export function disposeAll(logger: Logging|undefined) {
+   useContainerRaw() 
+        ?.disposeAll()
+        .then(() => logger?.info({ message: 'Cleaning container and crashing' }));
+}
+
+type Insertable = | ((container: Dependencies) => object)
+                  | object
+
+const dependencyBuilder = (container: Container) => {
+    return {
+        /**
+          * Insert a dependency into your container.
+          * Supply the correct key and dependency
+          */
+        add(key: keyof Dependencies, v: Insertable) {
+            if(typeof v !== 'function') {
+                container.addSingleton(key, v)
+            } else {
+                //@ts-ignore
+                container.addWiredSingleton(key, (cntr) => v(cntr))
+            }
+        },
+        /**
+          * @param key the key of the dependency
+          * @param v The dependency to swap out.
+          * Swap out a preexisting dependency.
+          */
+        swap(key: keyof Dependencies, v: Insertable) {
+            container.swap(key, v);
+        },
+   };
+};
+
+type ValidDependencyConfig =
+    (c: ReturnType<typeof dependencyBuilder>) => any
+
+/**
+  * makeDependencies constructs a dependency injection container for sern handler to use.
+  * This is required to start the handler, and is to be called before Sern.init.
+  * @example
+  * ```ts
+  * await makeDependencies(({ add }) => {
+  *     add('@sern/client', new Client({ intents, partials }) 
+  * })
+  * ```
+  */
+export async function makeDependencies (conf: ValidDependencyConfig) {
+    const container = await __init_container({ autowire: false });
+    //We only include logger if it does not exist 
+    const includeLogger = !container.hasKey('@sern/logger');
+
+    if(includeLogger) {
+        container.addSingleton('@sern/logger', new __Services.DefaultLogging);
+    }
+    container.addSingleton('@sern/errors', new __Services.DefaultErrorHandling);
+    container.addSingleton('@sern/modules', new Map);
+    container.addSingleton('@sern/emitter', new EventEmitter)
+    container.addWiredSingleton('@sern/cron', 
+                         (deps) => new __Services.Cron(deps as unknown as Dependencies))
+    conf(dependencyBuilder(container));
+    await container.ready();
+}
+
+
+/**
+ * The new Service api, a cleaner alternative to useContainer
+ * To obtain intellisense, ensure a .d.ts file exists in the root of compilation.
+ * Usually our scaffolding tool takes care of this.
+ * Note: this method only works AFTER your container has been initiated
+ * @since 3.0.0
+ * @example
+ * ```ts
+ * const client = Service('@sern/client');
+ * ```
+ * @param key a key that corresponds to a dependency registered.
+ *
+ */
+export function Service<const T extends keyof Dependencies>(key: T) {
+    return $Service(key) as Dependencies[T]
+}
+/**
+ * @since 3.0.0
+ * The plural version of {@link Service}
+ * @returns array of dependencies, in the same order of keys provided
+ */
+export function Services<const T extends (keyof Dependencies)[]>(...keys: [...T]) {
+    return $Services<T, IntoDependencies<T>>(...keys)
+}
+
+/**
+ * @deprecated
+ * Creates a singleton object.
+ * @param cb
+ */
+export function single<T>(cb: () => T) { 
+    console.log('The `single` function is deprecated and has no effect')
+    return cb(); 
+}
+
+/**
+ * @deprecated
+ * @since 2.0.0
+ * Creates a transient object
+ * @param cb
+ */
+export function transient<T>(cb: () => () => T) { 
+    console.log('The `transient` function is deprecated and has no effect')
+    return cb()(); 
+}
+