diff --git a/src/auth/operations/forgotPassword.ts b/src/auth/operations/forgotPassword.ts
index 5699cc59f7e..86b83b1a1dd 100644
--- a/src/auth/operations/forgotPassword.ts
+++ b/src/auth/operations/forgotPassword.ts
@@ -1,11 +1,12 @@
 import crypto from 'crypto';
+import { AfterForgotPasswordHook, BeforeOperationHook } from '../../collections/config/types';
 import { APIError } from '../../errors';
 
 async function forgotPassword(incomingArgs) {
   const { config, sendEmail: email } = this;
 
   if (!Object.prototype.hasOwnProperty.call(incomingArgs.data, 'email')) {
-    throw new APIError('Missing email.');
+    throw new APIError('Missing email.', 400);
   }
 
   let args = incomingArgs;
@@ -14,7 +15,7 @@ async function forgotPassword(incomingArgs) {
   // beforeOperation - Collection
   // /////////////////////////////////////
 
-  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook, hook) => {
+  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook: BeforeOperationHook, hook: BeforeOperationHook) => {
     await priorHook;
 
     args = (await hook({
@@ -38,7 +39,7 @@ async function forgotPassword(incomingArgs) {
   // Forget password
   // /////////////////////////////////////
 
-  let token = crypto.randomBytes(20);
+  let token: string | Buffer = crypto.randomBytes(20);
   token = token.toString('hex');
 
   const user = await Model.findOne({ email: data.email.toLowerCase() });
@@ -90,7 +91,7 @@ async function forgotPassword(incomingArgs) {
   // afterForgotPassword - Collection
   // /////////////////////////////////////
 
-  await collectionConfig.hooks.afterForgotPassword.reduce(async (priorHook, hook) => {
+  await collectionConfig.hooks.afterForgotPassword.reduce(async (priorHook: AfterForgotPasswordHook, hook: AfterForgotPasswordHook) => {
     await priorHook;
     await hook({ args });
   }, Promise.resolve());
diff --git a/src/auth/operations/login.ts b/src/auth/operations/login.ts
index 5a56a2bb07b..9deb06d1fc9 100644
--- a/src/auth/operations/login.ts
+++ b/src/auth/operations/login.ts
@@ -3,6 +3,7 @@ import { AuthenticationError, LockedAuth } from '../../errors';
 import getCookieExpiration from '../../utilities/getCookieExpiration';
 import isLocked from '../isLocked';
 import removeInternalFields from '../../utilities/removeInternalFields';
+import { BeforeLoginHook, BeforeOperationHook } from '../../collections/config/types';
 
 async function login(incomingArgs) {
   const { config, operations, secret } = this;
@@ -13,7 +14,7 @@ async function login(incomingArgs) {
   // beforeOperation - Collection
   // /////////////////////////////////////
 
-  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook, hook) => {
+  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook: BeforeOperationHook, hook: BeforeOperationHook) => {
     await priorHook;
 
     args = (await hook({
diff --git a/src/auth/operations/refresh.ts b/src/auth/operations/refresh.ts
index cd533166dfb..5a2cea9c181 100644
--- a/src/auth/operations/refresh.ts
+++ b/src/auth/operations/refresh.ts
@@ -1,4 +1,5 @@
 import jwt from 'jsonwebtoken';
+import { BeforeOperationHook } from '../../collections/config/types';
 import { Forbidden } from '../../errors';
 import getCookieExpiration from '../../utilities/getCookieExpiration';
 
@@ -9,7 +10,7 @@ async function refresh(incomingArgs) {
   // beforeOperation - Collection
   // /////////////////////////////////////
 
-  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook, hook) => {
+  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook: BeforeOperationHook, hook: BeforeOperationHook) => {
     await priorHook;
 
     args = (await hook({
diff --git a/src/collections/config/types.ts b/src/collections/config/types.ts
index f1519d414d8..50799d32b52 100644
--- a/src/collections/config/types.ts
+++ b/src/collections/config/types.ts
@@ -1,14 +1,9 @@
-import { Access, Hook } from '../../config/types';
+/* eslint-disable no-use-before-define */
+/* eslint-disable @typescript-eslint/no-explicit-any */
+import { Access } from '../../config/types';
 import { Field } from '../../fields/config/types';
 import { PayloadRequest } from '../../express/types/payloadRequest';
 
-export type ImageSize = {
-  name: string,
-  width: number,
-  height: number,
-  crop: string, // comes from sharp package
-};
-
 export type Collection = {
   slug: string;
   labels?: {
@@ -22,18 +17,17 @@ export type Collection = {
     components?: any;
   };
   hooks?: {
-    beforeOperation?: Hook[];
-    beforeValidate?: Hook[];
-    beforeChange?: Hook[];
-    afterChange?: Hook[];
-    beforeRead?: Hook[];
-    afterRead?: Hook[];
-    beforeDelete?: Hook[];
-    afterDelete?: Hook[];
-    beforeLogin?: Hook[];
-    afterLogin?: Hook[];
-    afterForgotPassword?: Hook[];
-    forgotPassword?: Hook[];
+    beforeOperation?: BeforeOperationHook[];
+    beforeValidate?: BeforeValidateHook[];
+    beforeChange?: BeforeChangeHook[];
+    afterChange?: AfterChangeHook[];
+    beforeRead?: BeforeReadHook[];
+    afterRead?: AfterReadHook[];
+    beforeDelete?: BeforeDeleteHook[];
+    afterDelete?: AfterDeleteHook[];
+    beforeLogin?: BeforeLoginHook[];
+    afterLogin?: AfterLoginHook[];
+    afterForgotPassword?: AfterForgotPasswordHook[];
   };
   access?: {
     create?: Access;
@@ -59,11 +53,11 @@ export type Collection = {
     }
     | boolean;
     forgotPassword?: {
-      generateEmailHTML?: (args?: {token?: string, email?: string, req?: PayloadRequest}) => string,
-      generateEmailSubject?: (args?: {req?: PayloadRequest}) => string,
+      generateEmailHTML?: (args?: { token?: string, email?: string, req?: PayloadRequest }) => string,
+      generateEmailSubject?: (args?: { req?: PayloadRequest }) => string,
     }
   };
-  config: {[key: string]: any};
+  config: { [key: string]: any };
   upload: {
     imageSizes: ImageSize[];
     staticURL: string;
@@ -71,3 +65,83 @@ export type Collection = {
     adminThumbnail?: string;
   };
 };
+
+export type ImageSize = {
+  name: string,
+  width: number,
+  height: number,
+  crop: string, // comes from sharp package
+};
+
+// Hooks
+
+export type HookOperationType =
+  | 'create'
+  | 'read'
+  | 'update'
+  | 'delete'
+  | 'refresh'
+  | 'login'
+  | 'forgotPassword';
+
+export type BeforeOperationHook = (args?: {
+  args?: any;
+  operation: HookOperationType;
+}) => any;
+
+export type BeforeValidateHook = (args?: {
+  data?: any;
+  req?: PayloadRequest;
+  operation: 'create' | 'update';
+  originalDoc?: any; // undefined on 'create' operation
+}) => any;
+
+export type BeforeChangeHook = (args?: {
+  data: any;
+  req: PayloadRequest;
+  operation: 'create' | 'update'
+  originalDoc?: any; // undefined on 'create' operation
+}) => any;
+
+export type AfterChangeHook = (args?: {
+  doc: any;
+  req: PayloadRequest;
+  operation: 'create' | 'update';
+}) => any;
+
+export type BeforeReadHook = (args?: {
+  doc: any;
+  req: PayloadRequest;
+  query: { [key: string]: any };
+}) => any;
+
+export type AfterReadHook = (args?: {
+  doc: any;
+  req: PayloadRequest;
+  query: { [key: string]: any };
+}) => any;
+
+export type BeforeDeleteHook = (args?: {
+  req: PayloadRequest;
+  id: string;
+}) => any;
+
+export type AfterDeleteHook = (args?: {
+  req: PayloadRequest;
+  id: string;
+  doc: any;
+}) => any;
+
+export type BeforeLoginHook = (args?: {
+  req: PayloadRequest;
+}) => any;
+
+export type AfterLoginHook = (args?: {
+  req: PayloadRequest;
+  user: any;
+  token: string;
+}) => any;
+
+export type AfterForgotPasswordHook = (args?: {
+  args?: any;
+}) => any;
diff --git a/src/collections/init.ts b/src/collections/init.ts
index e004dc4cefa..fb083935153 100644
--- a/src/collections/init.ts
+++ b/src/collections/init.ts
@@ -2,13 +2,17 @@ import mongoose from 'mongoose';
 import express from 'express';
 import passport from 'passport';
 import passportLocalMongoose from 'passport-local-mongoose';
-const LocalStrategy = require('passport-local').Strategy;
+import Passport from 'passport-local';
+import { UpdateQuery } from 'mongodb';
 import apiKeyStrategy from '../auth/strategies/apiKey';
 import buildSchema from './buildSchema';
 import bindCollectionMiddleware from './bindCollection';
+import { Collection } from './config/types';
 
-function registerCollections() {
-  this.config.collections = this.config.collections.map((collection) => {
+const LocalStrategy = Passport.Strategy;
+
+export default function registerCollections(): void {
+  this.config.collections = this.config.collections.map((collection: Collection) => {
     const formattedCollection = collection;
 
     const schema = buildSchema(formattedCollection, this.config);
@@ -32,7 +36,8 @@ function registerCollections() {
             }, cb);
           }
 
-          const updates = { $inc: { loginAttempts: 1 } };
+          type LoginSchema = { loginAttempts: number; };
+          const updates: UpdateQuery<LoginSchema> = { $inc: { loginAttempts: 1 } };
           // Lock the account if at max attempts and not already locked
           if (this.loginAttempts + 1 >= maxLoginAttempts && !this.isLocked) {
             updates.$set = { lockUntil: Date.now() + lockTime };
@@ -151,5 +156,3 @@ function registerCollections() {
     return formattedCollection;
   });
 }
-
-export default registerCollections;
diff --git a/src/collections/operations/create.ts b/src/collections/operations/create.ts
index fc8d96647b9..44a576227ab 100644
--- a/src/collections/operations/create.ts
+++ b/src/collections/operations/create.ts
@@ -12,6 +12,7 @@ import getImageSize from '../../uploads/getImageSize';
 import imageMIMETypes from '../../uploads/imageMIMETypes';
 
 import sendVerificationEmail from '../../auth/sendVerificationEmail';
+import { AfterChangeHook, BeforeOperationHook, BeforeValidateHook } from '../config/types';
 
 async function create(incomingArgs) {
   const { performFieldOperations, config } = this;
@@ -22,7 +23,7 @@ async function create(incomingArgs) {
   // beforeOperation - Collection
   // /////////////////////////////////////
 
-  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook, hook) => {
+  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook: BeforeOperationHook, hook: BeforeOperationHook) => {
     await priorHook;
 
     args = (await hook({
@@ -73,7 +74,7 @@ async function create(incomingArgs) {
   // beforeValidate - Collections
   // /////////////////////////////////////
 
-  await collectionConfig.hooks.beforeValidate.reduce(async (priorHook, hook) => {
+  await collectionConfig.hooks.beforeValidate.reduce(async (priorHook: BeforeValidateHook, hook: BeforeValidateHook) => {
     await priorHook;
 
     data = (await hook({
@@ -214,7 +215,7 @@ async function create(incomingArgs) {
   // afterChange - Collection
   // /////////////////////////////////////
 
-  await collectionConfig.hooks.afterChange.reduce(async (priorHook, hook) => {
+  await collectionConfig.hooks.afterChange.reduce(async (priorHook: AfterChangeHook, hook: AfterChangeHook) => {
     await priorHook;
 
     result = await hook({
diff --git a/src/collections/operations/delete.ts b/src/collections/operations/delete.ts
index 6e5d7d34ab8..32955b2ab14 100644
--- a/src/collections/operations/delete.ts
+++ b/src/collections/operations/delete.ts
@@ -5,6 +5,7 @@ import removeInternalFields from '../../utilities/removeInternalFields';
 import { NotFound, Forbidden, ErrorDeletingFile } from '../../errors';
 import executeAccess from '../../auth/executeAccess';
 import fileExists from '../../uploads/fileExists';
+import { BeforeOperationHook } from '../config/types';
 
 async function deleteQuery(incomingArgs) {
   let args = incomingArgs;
@@ -13,7 +14,7 @@ async function deleteQuery(incomingArgs) {
   // beforeOperation - Collection
   // /////////////////////////////////////
 
-  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook, hook) => {
+  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook: BeforeOperationHook, hook: BeforeOperationHook) => {
     await priorHook;
 
     args = (await hook({
diff --git a/src/collections/operations/find.ts b/src/collections/operations/find.ts
index 321394d6525..cdacf3075be 100644
--- a/src/collections/operations/find.ts
+++ b/src/collections/operations/find.ts
@@ -1,5 +1,6 @@
 import executeAccess from '../../auth/executeAccess';
 import removeInternalFields from '../../utilities/removeInternalFields';
+import { BeforeOperationHook, BeforeReadHook } from '../config/types';
 
 async function find(incomingArgs) {
   let args = incomingArgs;
@@ -8,7 +9,7 @@ async function find(incomingArgs) {
   // beforeOperation - Collection
   // /////////////////////////////////////
 
-  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook, hook) => {
+  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook: BeforeOperationHook, hook: BeforeOperationHook) => {
     await priorHook;
 
     args = (await hook({
diff --git a/src/collections/operations/findByID.ts b/src/collections/operations/findByID.ts
index e4c14b3a390..f52b404f2b3 100644
--- a/src/collections/operations/findByID.ts
+++ b/src/collections/operations/findByID.ts
@@ -1,5 +1,6 @@
-/* eslint-disable no-underscore-dangle */
 import memoize from 'micro-memoize';
+import { BeforeOperationHook } from '../config/types';
+/* eslint-disable no-underscore-dangle */
 import removeInternalFields from '../../utilities/removeInternalFields';
 import { Forbidden, NotFound } from '../../errors';
 import executeAccess from '../../auth/executeAccess';
@@ -11,7 +12,7 @@ async function findByID(incomingArgs) {
   // beforeOperation - Collection
   // /////////////////////////////////////
 
-  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook, hook) => {
+  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook: BeforeOperationHook, hook: BeforeOperationHook) => {
     await priorHook;
 
     args = (await hook({
diff --git a/src/collections/operations/update.ts b/src/collections/operations/update.ts
index f28a426c49f..b79ef4b5c79 100644
--- a/src/collections/operations/update.ts
+++ b/src/collections/operations/update.ts
@@ -1,6 +1,7 @@
 import httpStatus from 'http-status';
 import deepmerge from 'deepmerge';
 import path from 'path';
+import { BeforeOperationHook, BeforeChangeHook, BeforeValidateHook } from '../config/types';
 
 import removeInternalFields from '../../utilities/removeInternalFields';
 import overwriteMerge from '../../utilities/overwriteMerge';
@@ -12,6 +13,7 @@ import getSafeFilename from '../../uploads/getSafeFilename';
 
 import resizeAndSave from '../../uploads/imageResizer';
 
+
 async function update(incomingArgs) {
   let args = incomingArgs;
 
@@ -19,7 +21,7 @@ async function update(incomingArgs) {
   // beforeOperation - Collection
   // /////////////////////////////////////
 
-  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook, hook) => {
+  await args.collection.config.hooks.beforeOperation.reduce(async (priorHook: BeforeOperationHook, hook: BeforeOperationHook) => {
     await priorHook;
 
     args = (await hook({
@@ -111,7 +113,7 @@ async function update(incomingArgs) {
   // beforeValidate - Collection
   // /////////////////////////////////////
 
-  await collectionConfig.hooks.beforeValidate.reduce(async (priorHook, hook) => {
+  await collectionConfig.hooks.beforeValidate.reduce(async (priorHook: BeforeValidateHook, hook: BeforeValidateHook) => {
     await priorHook;
 
     data = (await hook({
@@ -140,7 +142,7 @@ async function update(incomingArgs) {
   // beforeChange - Collection
   // /////////////////////////////////////
 
-  await collectionConfig.hooks.beforeChange.reduce(async (priorHook, hook) => {
+  await collectionConfig.hooks.beforeChange.reduce(async (priorHook: BeforeChangeHook, hook: BeforeChangeHook) => {
     await priorHook;
 
     data = (await hook({
diff --git a/src/config/types.ts b/src/config/types.ts
index 5dada444455..2bd6976a8e9 100644
--- a/src/config/types.ts
+++ b/src/config/types.ts
@@ -47,17 +47,18 @@ export type Access = (args?: any) => boolean;
 
 export type Config = {
   admin?: {
-    user?: string
+    user?: string;
     meta?: {
-      titleSuffix?: string
-      ogImage?: string
-      favicon?: string
+      titleSuffix?: string;
+      ogImage?: string;
+      favicon?: string;
     }
-    disable?: boolean
+    disable?: boolean;
+    indexHTML?: string;
   };
   collections?: Collection[];
   globals?: Global[];
-  serverURL?: string;
+  serverURL: string;
   cookiePrefix?: string;
   csrf?: string[];
   cors?: string[];
@@ -68,7 +69,7 @@ export type Config = {
     graphQL?: string;
     graphQLPlayground?: string;
   };
-  express: {
+  express?: {
     json: {
       limit?: number
     }
diff --git a/src/globals/operations/update.ts b/src/globals/operations/update.ts
index 3256a63baa7..9b1f9acca0e 100644
--- a/src/globals/operations/update.ts
+++ b/src/globals/operations/update.ts
@@ -2,6 +2,7 @@ import deepmerge from 'deepmerge';
 import overwriteMerge from '../../utilities/overwriteMerge';
 import executeAccess from '../../auth/executeAccess';
 import removeInternalFields from '../../utilities/removeInternalFields';
+import { AfterChangeHook, BeforeValidateHook } from '../../collections/config/types';
 
 async function update(args) {
   const { globals: { Model } } = this;
@@ -53,7 +54,7 @@ async function update(args) {
   // 3. Execute before validate collection hooks
   // /////////////////////////////////////
 
-  await globalConfig.hooks.beforeValidate.reduce(async (priorHook, hook) => {
+  await globalConfig.hooks.beforeValidate.reduce(async (priorHook: BeforeValidateHook, hook: BeforeValidateHook) => {
     await priorHook;
 
     data = (await hook({
@@ -123,7 +124,7 @@ async function update(args) {
   // 9. Execute after global hook
   // /////////////////////////////////////
 
-  await globalConfig.hooks.afterChange.reduce(async (priorHook, hook) => {
+  await globalConfig.hooks.afterChange.reduce(async (priorHook: AfterChangeHook, hook: AfterChangeHook) => {
     await priorHook;
 
     global = await hook({