Validator ajv6 (rjsf-team#2891)

* Added new package for validator-ajv6
- Refactored `packages/core/src/validate.js` into this new package

* - Switched to the new `@rjsf/utils` library and types

* - Finished types conversion to @rjsf/utils
- Began adding tests

* - Completed conversion for validator class-based tests. Just need to get to 100%
1

* - Finished 100% test coverage and documentation of the `AJV6Validator`

* - Completed the documentation of the remaining methods and types for the library

* - Responded to self-review feedback and also fixed tests to hopefully get it to pass

* - Fixed the build (this time hopefully)

* - Switched to just passing `stack` instead of the whole empty object

* - Added hacky run of tests from within the utils directory

* - Fixed a few little things

* - Fixed bug in custom validation, including adding a test to detect it

* - Removed schema utils test for `stubExistingAdditionalPropertiesTest()` as it no longer exists

* - Fixed self-review feedback and the import in the `test/createAjvInstance.test.ts`
- Also bumped all the packages that made sense

packages/validator-ajv6/.eslintrc

@@ -0,0 +1,29 @@
+{
+  "parser": "@typescript-eslint/parser",
+  "rules": {
+    "curly": [2],
+    "linebreak-style": [2, "unix"],
+    "semi": [2, "always"],
+    "comma-dangle": [0],
+    "no-unused-vars": [2, {
+      "vars": "all",
+      "args": "none",
+      "ignoreRestSiblings": true
+    }],
+    "no-console": [0],
+    "object-curly-spacing": [2, "always"],
+    "keyword-spacing": ["error"],
+    "no-prototype-builtins": "warn",
+    "@typescript-eslint/no-empty-function": "warn",
+    "@typescript-eslint/no-var-requires": "warn"
+  },
+  "env": {
+    "es6": true,
+    "browser": true,
+    "node": true
+  },
+  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+  "plugins": [
+    "@typescript-eslint"
+  ]
+}

packages/validator-ajv6/.gitignore

@@ -0,0 +1 @@
+.rts2_**

packages/validator-ajv6/README.md

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+[![Build Status][build-shield]][build-url]
+[![npm][npm-shield]][npm-url]
+[![npm downloads][npm-dl-shield]][npm-dl-url]
+[![Contributors][contributors-shield]][contributors-url]
+[![Apache 2.0 License][license-shield]][license-url]
+
+<!-- PROJECT LOGO -->
+<br />
+<p align="center">
+  <a href="https://github.com/rjsf-team/react-jsonschema-form">
+    <img src="https://raw.githubusercontent.com/rjsf-team/react-jsonschema-form/59a8206e148474bea854bbb004f624143fbcbac8/packages/validator-ajv6/logo.png" alt="Logo" width="120" height="120">
+  </a>
+
+  <h3 align="center">@rjsf/validator-ajv6</h3>
+
+  <p align="center">
+  AJV-6 based validator plugin for <a href="https://github.com/rjsf-team/react-jsonschema-form/"><code>react-jsonschema-form</code></a>.
+    <br />
+    <a href="https://react-jsonschema-form.readthedocs.io/en/latest/"><strong>Explore the docs »</strong></a>
+    <br />
+    <br />
+    <a href="https://rjsf-team.github.io/react-jsonschema-form/">View Playground</a>
+    ·
+    <a href="https://github.com/rjsf-team/react-jsonschema-form/issues">Report Bug</a>
+    ·
+    <a href="https://github.com/rjsf-team/react-jsonschema-form/issues">Request Feature</a>
+  </p>
+</p>
+
+<!-- TABLE OF CONTENTS -->
+
+## Table of Contents
+
+- [About The Project](#about-the-project)
+- [Getting Started](#getting-started)
+  - [Prerequisites](#prerequisites)
+  - [Installation](#installation)
+- [Usage](#usage)
+- [Roadmap](#roadmap)
+- [Contributing](#contributing)
+- [Contact](#contact)
+
+<!-- ABOUT THE PROJECT -->
+
+## About The Project
+
+Exports `validator-ajv6` plugin for `react-jsonschema-form`.
+
+### Built With
+
+- [react-jsonschema-form](https://github.com/rjsf-team/react-jsonschema-form/)
+- [AJV](https://github.com/ajv-validator/ajv/)
+- [TypeScript](https://www.typescriptlang.org/)
+
+<!-- GETTING STARTED -->
+
+## Getting Started
+
+### Prerequisites
+
+#### React JsonSchema Form Utils
+
+- `@rjsf/utils >= 5.0.0`
+
+```bash
+yarn add @rjsf/core
+```
+
+### Installation
+
+```bash
+yarn add @rjsf/validator-ajv6
+```
+
+<!-- USAGE EXAMPLES -->
+
+## Usage
+
+```jsx
+import Form from '@rjsf/core';
+import validator from '@rjsf/validator-ajv6';
+
+const schema = {
+  type: 'string',
+};
+
+<Form schema={schema} validator={validator} />
+```
+
+or, using a more complex example using custom validator with custom formats
+
+```jsx
+import Form from '@rjsf/core';
+import { customizeValidator } from '@rjsf/validator-ajv6';
+
+const customFormats = {
+  'phone-us': /\(?\d{3}\)?[\s-]?\d{3}[\s-]?\d{4}$/
+};
+
+const validator = customizeValidator({
+  customFormats,
+});
+
+const schema = {
+  type: 'string',
+  format: 'phone-us'
+};
+
+<Form schema={schema} validator={validator} />
+```
+
+or, using a more complex example using a custom with additional meta schema
+
+```jsx
+import Form from '@rjsf/core';
+import { customizeValidator } from '@rjsf/validator-ajv6';
+
+const metaSchemaDraft04 = require("ajv/lib/refs/json-schema-draft-04.json");
+
+const validator = customizeValidator({
+  additionalMetaSchemas: [metaSchemaDraft04],
+});
+
+const schema = {
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  type: 'string',
+};
+
+<Form schema={schema} validator={validator} />
+```
+
+Finally, you can combine both additional meta schemas and custom formats.
+
+```jsx
+import Form from '@rjsf/core';
+import { customizeValidator } from '@rjsf/validator-ajv6';
+
+const metaSchemaDraft04 = require("ajv/lib/refs/json-schema-draft-04.json");
+
+const customFormats = {
+  'phone-us': /\(?\d{3}\)?[\s-]?\d{3}[\s-]?\d{4}$/
+};
+
+const validator = customizeValidator({
+  additionalMetaSchemas: [metaSchemaDraft04],
+  customFormats,
+});
+
+const schema = {
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  type: 'string',
+  format: 'phone-us'
+};
+
+<Form schema={schema} validator={validator} />
+```
+
+<!-- ROADMAP -->
+
+## Roadmap
+
+See the [open issues](https://github.com/rjsf-team/react-jsonschema-form/issues) for a list of proposed features (and known issues).
+
+<!-- CONTRIBUTING -->
+
+## Contributing
+
+Read our [contributors' guide](https://react-jsonschema-form.readthedocs.io/en/latest/contributing/) to get started.
+
+<!-- CONTACT -->
+
+## Contact
+
+rjsf team: [https://github.com/orgs/rjsf-team/people](https://github.com/orgs/rjsf-team/people)
+
+GitHub repository: [https://github.com/rjsf-team/react-jsonschema-form](https://github.com/rjsf-team/react-jsonschema-form)
+
+<!-- MARKDOWN LINKS & IMAGES -->
+<!-- https://www.markdownguide.org/basic-syntax/#reference-style-links -->
+
+[build-shield]: https://github.com/rjsf-team/react-jsonschema-form/workflows/CI/badge.svg
+[build-url]: https://github.com/rjsf-team/react-jsonschema-form/actions
+[contributors-shield]: https://img.shields.io/github/contributors/rjsf-team/react-jsonschema-form.svg
+[contributors-url]: https://github.com/rjsf-team/react-jsonschema-form/graphs/contributors
+[license-shield]: https://img.shields.io/badge/license-Apache%202.0-blue.svg?style=flat-square
+[license-url]: https://choosealicense.com/licenses/apache-2.0/
+[npm-shield]: https://img.shields.io/npm/v/@rjsf/material-ui/latest.svg?style=flat-square
+[npm-url]: https://www.npmjs.com/package/@rjsf/material-ui
+[npm-dl-shield]: https://img.shields.io/npm/dm/@rjsf/material-ui.svg?style=flat-square
+[npm-dl-url]: https://www.npmjs.com/package/@rjsf/material-ui
+[product-screenshot]: https://raw.githubusercontent.com/rjsf-team/react-jsonschema-form/e2e1181d1020f18cad0c80c661ddae28edb9794e/packages/material-ui/screenshot5.png

packages/validator-ajv6/babel.config.js

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+const defaultConfig = require('../../babel.config')
+
+module.exports = defaultConfig