Updated code to typescript.

.editorconfig

@@ -10,8 +10,10 @@ end_of_line = lf
 indent_size = 2
 indent_style = space
 insert_final_newline = false
-max_line_length = 80
+max_line_length = 120
 trim_trailing_whitespace = true
 
 [*.md]
 trim_trailing_whitespace = false
+indent_size = 4
+indent_style = space

.github/workflows/tests.yml

@@ -0,0 +1,35 @@
+name: tests
+
+on:
+  push:
+    branches:
+      - master
+
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version:
+          - 10.x
+          - 12.x
+          - 14.x
+          - 16.x
+          - 18.x
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - run: npm clean-install
+      - run: npm run test

.gitignore

@@ -29,4 +29,6 @@ node_modules
 
 # OS specific ignores
 .directory
-.idea
+.idea
+
+/lib

.mocharc.json

@@ -0,0 +1,10 @@
+{
+  "timeout"  : 15000,
+  "recursive": true,
+  "require"  : [
+    "ts-node/register",
+    "source-map-support/register"
+  ],
+  "reporter" : "progress",
+  "sort"     : true
+}

CHANGELOG.md

@@ -1,22 +1,28 @@
-## Release notes
+### Release Notes
 
-### 1.0.0
+#### 2.0.0
 
-* As module was very stable, bumped version to `1.0.0` so is marked as
+- (@DanielOverdevestPZH) Make plugin compatible with latest Sequelize v6. 
+- (@honzahommer) Added `readOnly` shortcut as alternative for `noUpdate.readOnly`.
+- Updated code to typescript.
+
+#### 1.0.0
+
+- As module was very stable, bumped version to `1.0.0` so is marked as
   **stable** for registries.
 
-### 0.2.0
+#### 0.2.0
 
-* Added `readOnly` option.
+- Added `readOnly` option.
 
-### 0.1.2
+#### 0.1.2
 
-* Removed strong tag from package name.
+- Removed strong tag from package name.
 
-### 0.1.1
+#### 0.1.1
 
-* Added keywords to `package.json`.
+- Added keywords to `package.json`.
 
-### 0.1.0
+#### 0.1.0
 
-* Initial release.
+- Initial release.

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) Diosney Sarmiento
+Copyright (c) 2016-Present Diosney Sarmiento
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,42 +1,61 @@
 # node-sequelize-noupdate-attributes
 
-A very simple [Sequelize](https://github.com/sequelize/sequelize) plugin which adds **no update** and **readonly** attributes support.
+A [Sequelize](https://sequelize.org) plugin which adds **no update** and **readonly** attributes support to models.
 
-## Prerequisites
+[![donate](https://shields.io/badge/ko--fi-donate-ff5f5f?logo=ko-fi&style=for-the-badgeKo-fi)](https://ko-fi.com/diosney)
+[![tests](https://github.com/diosney/node-sequelize-noupdate-attributes/actions/workflows/tests.yml/badge.svg?branch=master)](https://github.com/diosney/node-sequelize-noupdate-attributes/actions/workflows/tests.yml)
+[![npm](https://img.shields.io/npm/v/sequelize-noupdate-attributes)](https://www.npmjs.com/package/sequelize-noupdate-attributes)
 
-Have previously installed the `sequelize` package in the project.
+> **Note:** Starting from version `2.0.0`, the plugin supports Sequelize `v6`.
+> <br>Ensure to have at least the `v6.16.0` since there are some typings and functions, like `.getAttributes()`, that
+> weren't available from `v6.1.0`.
 
-## Install
+## Installation
+
+Ensure the `sequelize` package has been previously installed in the project.
 
 ```sh
 npm install --save sequelize-noupdate-attributes
 ```
 
 ## Usage
 
-Add the plugin to the sequelize instance and then set the noupdate
-properties in your models, as shown in the basic example below:
+### How to Import
+
+If you are using Javascript, you can import using the regular CommonJS `require` as follows:
+
+    const sequelizeNoUpdateAttributes  = require('sequelize-noupdate-attributes');
+
+If you are using Typescript, you can use the `require` calls, or just the Ecmascript modules import:
+
+    import sequelizeNoUpdateAttributes from 'sequelize-noupdate-attributes';
+
+### How to Use
+
+Add the plugin to the `sequelize` instance, then set the `noUpdate` or `readOnly` properties in your models
+as demonstrated in the examples below:
 
 ```js
-var sequelizeNoUpdateAttributes = require('sequelize-noupdate-attributes');
+const sequelizeNoUpdateAttributes = require('sequelize-noupdate-attributes');
 
-var sequelize = new Sequelize('database', 'user', 'password');
-sequelizeNoUpdateAttributes(sequelize); // Note that is the `sequelize` instance the passed reference.
+const sequelize = new Sequelize('sqlite::memory:');
+// Note that the passed reference is the `sequelize` instance.
+sequelizeNoUpdateAttributes(sequelize);
 
-var Post = sequelize.define('Post', {
+const Post = sequelize.define('Post', {
   content: {
-    type    : Sequelize.STRING,
+    type    : DataTypes.STRING,
     noUpdate: true
   }
 });
 ```
 
-What this do is to mark the `content` attribute so if an update is done, then:
+What this does is to mark the `content` attribute so if an update is done, then:
 
-* if the field previous value is null, it will accept the change
-* if the field previous value is not null, it will trigger a `SequelizeValidationErrorItem` error.
+* if the field's previous value is `null`, it will accept the change
+* if the field's previous value is not `null`, it will trigger a `ValidationErrorItem` error.
 
-so, the `content` field becomes a **readonly** after its becomes not null.
+so, the `content` field becomes **readonly** after its becomes not `null`.
 
 Works too with foreign key fields in associations:
 
@@ -45,27 +64,28 @@ models.Post.belongsTo(models.Person, {
   as        : 'Creator',
   foreignKey: {
     allowNull: false,
-    noUpdate : true    // Will mark the `CreatorId` field to be `noUpdate`d.
+    noUpdate : true    // It will mark the `CreatorId` field to be `noUpdate`.
   }
 });
 ```
 
-### Readonly attributes
+### Readonly Attributes
 
-If you do want truly **readonly** attributes with no modifications at all
+If you want truly **readonly** attributes with no modifications at all
 being allowed, you can use the `readonly` option as shown below:
 
 ```js
-var Post = sequelize.define('Post', {
+const Post = sequelize.define('Post', {
   content: {
-    type    : Sequelize.STRING,
+    type    : DataTypes.STRING,
     readOnly: true
   }
 });
 
-var Post = sequelize.define('Post', {
+// Or
+const Post = sequelize.define('Post', {
   content: {
-    type    : Sequelize.STRING,
+    type    : DataTypes.STRING,
     noUpdate: {
       readOnly: true
     }
@@ -74,23 +94,37 @@ var Post = sequelize.define('Post', {
 ```
 
 which effectively disables any modification on the `content` attribute,
-no matter if the previous value was null or not, though exception is
+no matter if the previous value was `null` or not, though the exception is
 when the record is new.
 
+If by any chance both `readonly` and `noUpdate` are present, `readOnly` takes precedence if is truthy.
+
+## Notes
+
+- The plugin does its work by registering a custom `beforeValidate` hook named `noUpdateAttributes`.
+
+- If the plugin triggers a validation error, it will be a Sequelize `ValidationError` instance containing an `errors` 
+  property of type `ValidationErrorItem[]`. 
+
+  Each `ValidationErrorItem` instance will have an attribute called `validatorKey`, which, in the case of a plugin
+  validation error, will be` 'noUpdateAttribute'` (`NoUpdateAttributesValidatorKeys.NoUpdateAttribute`).
+
 ## Issues
 
-The source is available for download from [GitHub](https://github.com/diosney/node-sequelize-noupdate-attributes)
-and there is a [issue tracker](https://github.com/diosney/node-sequelize-noupdate-attributes/issues) so you can report bugs there.
+The source code can be accessed on [GitHub](https://github.com/diosney/node-sequelize-noupdate-attributes).
+<br>
+If you encounter any bugs or need a new feature, please report them on the
+[issue tracker](https://github.com/diosney/node-sequelize-noupdate-attributes/issues).
 
 ## Tests
 
-To run the tests just execute `npm test`.
+Just run `npm test`.
 
 ## License
 
 The MIT License (MIT)
 
-Copyright (c) Diosney Sarmiento
+Copyright (c) 2016-Present Diosney Sarmiento
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal