feat: Add support for regular before, after and error hooks (#92)

This pulls over the code for Regular hooks from this PR: feathersjs/feathers#2483

Co-authored-by: marshall_thompson2 <marshall_thompson2@apple.com>
Co-authored-by: daffl <daff@neyeon.com>

packages/hooks/src/base.ts

@@ -1,4 +1,4 @@
-import { Middleware } from './compose';
+import { AsyncMiddleware } from './compose';
 import { copyToSelf, copyProperties } from './utils';
 
 export const HOOKS: string = Symbol('@feathersjs/hooks') as any;
@@ -30,7 +30,7 @@ export type HookDefaultsInitializer = (self?: any, args?: any[], context?: HookC
 export class HookManager {
   _parent?: this|null = null;
   _params: string[]|null = null;
-  _middleware: Middleware[]|null = null;
+  _middleware: AsyncMiddleware[]|null = null;
   _props: HookContextData|null = null;
   _defaults?: HookDefaultsInitializer;
 
@@ -40,13 +40,13 @@ export class HookManager {
     return this;
   }
 
-  middleware (middleware?: Middleware[]) {
+  middleware (middleware?: AsyncMiddleware[]) {
     this._middleware = middleware?.length ? middleware : null;
 
     return this;
   }
 
-  getMiddleware (): Middleware[]|null {
+  getMiddleware (): AsyncMiddleware[]|null {
     const previous = this._parent?.getMiddleware();
 
     if (previous && this._middleware) {
@@ -56,7 +56,7 @@ export class HookManager {
     return previous || this._middleware;
   }
 
-  collectMiddleware (self: any, _args: any[]): Middleware[] {
+  collectMiddleware (self: any, _args: any[]): AsyncMiddleware[] {
     const otherMiddleware = getMiddleware(self);
     const middleware = this.getMiddleware();
 
@@ -178,7 +178,7 @@ export class HookManager {
   }
 }
 
-export type HookOptions = HookManager|Middleware[]|null;
+export type HookOptions = HookManager|AsyncMiddleware[]|null;
 
 export function convertOptions (options: HookOptions = null) {
   if (!options) {
@@ -200,13 +200,13 @@ export function setManager<T> (target: T, manager: HookManager) {
   return target;
 }
 
-export function getMiddleware (target: any): Middleware[]|null {
+export function getMiddleware (target: any): AsyncMiddleware[]|null {
   const manager = getManager(target);
 
   return manager ? manager.getMiddleware() : null;
 }
 
-export function setMiddleware<T> (target: T, middleware: Middleware[]) {
+export function setMiddleware<T> (target: T, middleware: AsyncMiddleware[]) {
   const manager = new HookManager().middleware(middleware);
 
   return setManager(target, manager);

packages/hooks/src/compose.ts

@@ -1,9 +1,10 @@
 // TypeScript port of koa-compose (https://github.com/koajs/compose)
 export type NextFunction = () => Promise<any>;
 
-export type Middleware<T = any> = (context: T, next: NextFunction) => Promise<any>;
+export type AsyncMiddleware<T = any> = (context: T, next: NextFunction) => Promise<any>;
+export type Middleware<T = any> = AsyncMiddleware<T>;
 
-export function compose<T = any> (middleware: Middleware<T>[]) {
+export function compose<T = any> (middleware: AsyncMiddleware<T>[]) {
   if (!Array.isArray(middleware)) {
     throw new TypeError('Middleware stack must be an array!');
   }
@@ -14,7 +15,7 @@ export function compose<T = any> (middleware: Middleware<T>[]) {
     }
   }
 
-  return function (this: any, context: T, next?: Middleware<T>) {
+  return function (this: any, context: T, next?: AsyncMiddleware<T>) {
     // last called middleware #
     let index: number = -1;
 
@@ -27,7 +28,7 @@ export function compose<T = any> (middleware: Middleware<T>[]) {
 
       index = i;
 
-      let fn: Middleware|undefined = middleware[i];
+      let fn: AsyncMiddleware|undefined = middleware[i];
 
       if (i === middleware.length) {
         fn = next;

packages/hooks/src/hooks.ts

@@ -1,4 +1,4 @@
-import { compose, Middleware } from './compose';
+import { compose, AsyncMiddleware } from './compose';
 import {
   HookContext, setManager, HookContextData, HookOptions, convertOptions, setMiddleware
 } from './base';
@@ -23,7 +23,7 @@ export function functionHooks <F> (fn: F, managerOrMiddleware: HookOptions) {
     // Initialize the context
     const context = manager.initializeContext(this, args, base);
     // Assemble the hook chain
-    const hookChain: Middleware[] = [
+    const hookChain: AsyncMiddleware[] = [
       // Return `ctx.result` or the context
       (ctx, next) => next().then(() => returnContext ? ctx : ctx.result)
     ];
@@ -68,7 +68,7 @@ export type HookMap<O = any> = {
   [L in keyof O]?: HookOptions;
 }
 
-export function objectHooks (_obj: any, hooks: HookMap|Middleware[]) {
+export function objectHooks (_obj: any, hooks: HookMap|AsyncMiddleware[]) {
   const obj = typeof _obj === 'function' ? _obj.prototype : _obj;
 
   if (Array.isArray(hooks)) {