This plugin is used to create Nx plugins! It contains generators for generating common plugin features like generators, executors, migrations and more.

Nx plugins are npm packages that contain generators and executors to extend a Nx workspace. Generators are blueprints to create new files from templates, and executors run those files. These plugins also update the `nx.json` when generating new libs or apps.

> A list of plugins that is maintained by Nrwl is found in the [Nrwl/nx repo](https://github.com/nrwl/nx/tree/master/packages). \
> A list of custom plugins created by the community is found in the [Community](/community) section.
> Plugins are written using Nx Devkit. **Read [Nx Devkit](/devkit/index) for more information.**

{% youtube
src="https://www.youtube.com/embed/fC1-4fAZDP4"
title="Nx Tutorial: Building Custom Plugins for Nx"
width="100%" /%}

> For a detailed video explaining the things covered here and more, check out [Creating and Publishing Your Own Nx Plugin](https://www.youtube.com/watch?v=vVT7Al01VZc).

## Generating a Plugin

To get started with building a Nx Plugin, run the following command:

```bash
npx create-nx-plugin my-org --pluginName my-plugin
```

This command creates a brand-new workspace, and sets up a pre-configured plugin with the specified name.

> Note, the command above will create a plugin the package name set to `@my-org/my-plugin`. You can pass `--importPath` to provide a different package name.

> If you do not want to create a new workspace, install the `@nrwl/nx-plugin` dependency in an already existing workspace with npm or yarn. Then run `nx g @nrwl/nx-plugin:plugin [pluginName]`.

A new plugin is created with a default generator, executor, and e2e app.

## Generator

The created generator contains boilerplate that will do the following:

- Normalize a schema (the options that the generator accepts)
- Update the `project.json`
- Add the plugin's project to the `nx.json` file
- Add files to the disk using templates

There will be an exported default function that will be the main entry for the generator.

### Generator options

The `schema.d.ts` file contains all the options that the generator supports. By default, it includes `directory`, `tags`, and `name` as the options. If more options need to be added, please update this file and the `schema.json` file.

{% callout type="note" title="More details" %}
The `schema.d.ts` file is used for type checking inside the implementation file. It should match the properties in `schema.json`.
{% /callout %}

### Adding more generators

To add more generators to the plugin, run the following command:
`nx generate @nrwl/nx-plugin:generator [generatorName] --project=[pluginName]`.

This will scaffold out a new generator and update the necessary files to support it.

### Generator Testing

The generator spec file includes boilerplate to help get started with testing. This includes setting up an empty workspace.

These tests should ensure that files within the tree (created with `createTreeWithEmptyWorkspace`) are in the correct place, and contain the right content.

Full E2Es are supported (and recommended) and will run everything on the file system like a user would.

## Executor

The default executor is set up to just emit a console log. Some examples of what an executor can do are:

- Support different languages, (Java, Go, Python, C#)
- Compile new UI framework components
- Deploy an app on a CDN
- Publish to NPM
- and many more!

### Adding more executors

To add more executors to the plugin, run the following command:
`nx generate @nrwl/nx-plugin:executor [executor] --project=[pluginName]`.

This will scaffold out a new generator and update the necessary files to support it.

### Executor testing

The executor spec file contains boilerplate to run the default exported function from the executor.

These tests should make sure that the executor is executing and calling the functions that it relies on.

Full E2Es are supported (and recommended) and will run everything on the file system like a user would.

## Testing your plugin

One of the biggest benefits that the Nx Plugin package provides is support for E2E and unit testing.

When the E2E app runs, a temporary E2E directory is created in the root of the workspace. This directory is a blank Nx workspace, and will have the plugin's built package installed locally.

### E2E Testing file

When the plugin is generated, a test file is created in the `my-plugin-e2e` app. Inside this test file, there are already tests for making sure that the executor ran, checking if directories are created with the `--directory` option, and checking if tags are added to the project configuration.

We'll go over a few parts of a test file below:

```typescript
it('should create my-plugin', async (done) => {
  const plugin = uniq('my-plugin');
  ensureNxProject('@my-org/my-plugin', 'dist/packages/my-plugin');
  await runNxCommandAsync(`generate @my-org/my-plugin:myPlugin ${plugin}`);

  const result = await runNxCommandAsync(`build ${plugin}`);
  expect(result.stdout).toContain('Executor ran');

  done();
});
```

- The `uniq` function creates a random name with the prefix and a random number.
- The `ensureNxProject` is the function that will create the temporary directory. It takes two arguments, the plugin package name and the dist directory of when it's built.
- The `runNxCommandAsync` will execute a `nx` command in the E2E directory.

There are additional functions that the `@nrwl/nx-plugin/testing` package exports. Most of them are file utilities to manipulate and read files in the E2E directory.

## Including Assets

Sometimes you might want to include some assets with the plugin. This might be a image or some additional binaries.

To make sure that assets are copied to the dist folder, open the plugin's `project.json` file. Inside the `build` property, add additional assets. By default, all `.md` files in the root, all non-ts files in folders, and the `generators.json` and `executors.json` files are included.

```json
"build": {
  "executor": "@nrwl/node:package",
  "options": {
    // shortened...
    "assets": [
      "packages/my-plugin/*.md",
      {
        "input": "./packages/my-plugin/src",
        "glob": "**/*.!(ts)",
        "output": "./src"
      },
      {
        "input": "./packages/my-plugin",
        "glob": "generators.json",
        "output": "."
      },
      {
        "input": "./packages/my-plugin",
        "glob": "executors.json",
        "output": "."
      }
    ]
  }
}
```

## Using your Nx Plugin

To use your plugin, simply list it in `nx.json` or use its generators and executors as you would for any other plugin. This could look like `nx g @my-org/my-plugin:lib` for generators or `"executor": "@my-org/my-plugin:build"` for executors. It should be usable in all of the same ways as published plugins in your local workspace immediately after generating it. This includes setting it up as the default collection in `nx.json`, which would allow you to run `nx g lib` and hit your plugin's generator.

## Publishing your Nx Plugin

In order to use your plugin in other workspaces or share it with the community, you will need to publish it to an npm registry. To publish your plugin follow these steps:

1. Build your plugin with the command `nx run my-plugin:build`
1. `npm publish ./dist/package/my-plugin` and follow the prompts from npm.
1. That's it!

{% callout type="warning" title="Version bump" %}
Currently you will have to modify the `package.json` version by yourself or with a tool.
{% /callout %}

After that, you can then install your plugin like any other npm package,
`npm i -D @my-org/my-plugin` or `yarn add -D @my-org/my-plugin`.

### Listing your Nx Plugin

Nx provides a utility (`nx list`) that lists both core and community plugins. To submit your plugin, please follow the steps below:

- Fork the [Nx repo](https://github.com/nrwl/nx/fork) (if you haven't already)
- Update the [`community/approved-plugins.json` file](https://github.com/nrwl/nx/blob/master/community/approved-plugins.json) with a new entry for your plugin that includes name, url and description
- Use the following commit message template: `chore(core): nx plugin submission [PLUGIN_NAME]`
- push your changes, and run `yarn submit-plugin`

> The `yarn submit-plugin` command automatically opens the Github pull request process with the correct template.

We will then verify the plugin, offer suggestions or merge the pull request!

## Preset

A Preset is a customization option which you provide when creating a new workspace. TS, Node, React are some internal presets that Nx provides by default.

{% youtube
src="https://www.youtube.com/embed/yGUrF0-uqaU"
title="Develop a Nx Preset for your Nx Plugin"
width="100%" /%}

### Custom Preset

At its core a preset is a generator, which we can create inside of a plugin.
If you **don't** have an existing plugin you can create one by running

```bash
  npx create-nx-plugin my-org --pluginName my-plugin
```

To create our preset inside of our plugin we can run

```bash
  nx generate @nrwl/nx-plugin:generator --name=preset --project=happynrwl
```

{% callout type="warning" title="Double check" %}
The word `preset` is required for the name of this generator
{% /callout %}

You should have a similar structure to this:

```treeview
happynrwl/
	├── e2e
	├── jest.config.js
	├── jest.preset.js
	├── nx.json
	├── package-lock.json
	├── package.json
	├── packages
	│   └── happynrwl
	│       ├── src
	│       │   ├── executors
	│       │   ├── generators
	│       │   │   ├── happynrwl
	│       │   │   └── preset 		// <------------- Here
	│       │   └── index.ts
	├── tools
	└── tsconfig.base.json
```

After the command is finished, the preset generator is created under the folder named **preset**.
The **generator.ts** provides an entry point to the generator. This file contains a function that is called to perform manipulations on a tree that represents the file system. The **schema.json** provides a description of the generator, available options, validation information, and default values.

Here is the sample generator function which you can customize to meet your needs.

```typescript
export default async function (tree: Tree, options: PresetGeneratorSchema) {
  const normalizedOptions = normalizeOptions(tree, options);
  addProjectConfiguration(tree, normalizedOptions.projectName, {
    root: normalizedOptions.projectRoot,
    projectType: 'application',
    sourceRoot: `${normalizedOptions.projectRoot}/src`,
    targets: {
      exec: {
        executor: 'nx:run-commands',
        options: {
          command: `node ${projectRoot}/src/index.js`,
        },
      },
    },
    tags: normalizedOptions.parsedTags,
  });
  addFiles(tree, normalizedOptions);
  await formatFiles(tree);
}
```

To get an in-depth guide on customizing/running or debugging your generator see [local generators](/recipe/local-generators).

#### Usage

Before you are able to use your newly created preset you must package and publish it to a registry.

After you have published your plugin to a registry you can now use your preset when creating a new workspace

```bash
npx create-nx-workspace my-workspace --preset=my-plugin-name
```


Overview

Creates and runs the E2E tests for an Nx Plugin.

Exit the test suite immediately after `n` number of failing tests. (https://jestjs.io/docs/cli#--bail)

Runs tests related to the changes since the provided branch or commit hash. If the current branch has diverged from the given branch, then only changes made locally will be tested. (https://jestjs.io/docs/cli#--changedsince)

Whether to run Jest in continuous integration (CI) mode. This option is on by default in most popular CI environments. It will prevent snapshots from being written unless explicitly requested. (https://jestjs.io/docs/cli#--ci)

Deletes the Jest cache directory and then exits without running tests. Will delete Jest's default cache directory. _Note: clearing the cache will reduce performance_.

Indicates that test coverage information should be collected and reported in the output. (https://jestjs.io/docs/cli#--coverageboolean)

Forces test results output color highlighting (even if `stdout` is not a TTY). Set to false if you would like to have no colors. (https://jestjs.io/docs/cli#--colors)

Forces test results output highlighting even if stdout is not a TTY. (https://jestjs.io/docs/cli#--colors)

The directory where Jest should output its coverage files.

A list of reporter names that Jest uses when writing coverage reports. Any istanbul reporter.

**EXPERIMENTAL**: Detect memory leaks in tests. After executing a test, it will try to garbage collect the global object used, and fail if it was leaked

Attempt to collect and print open handles preventing Jest from exiting cleanly (https://jestjs.io/docs/cli#--detectopenhandles)

Prints the test results in `JSON`. This mode will send all other test output and user messages to `stderr`. (https://jestjs.io/docs/cli#--json)

Logs the heap usage after every test. Useful to debug memory leaks. Use together with --runInBand and --expose-gc in node.

Specifies the maximum number of workers the worker-pool will spawn for running tests. This defaults to the number of the cores available on your machine. Useful for CI. (its usually best not to override this default) (https://jestjs.io/docs/cli#--maxworkersnumstring)

Attempts to identify which tests to run based on which files have changed in the current repository. Only works if you're running tests in a `git` or `hg` repository at the moment. (https://jestjs.io/docs/cli#--onlychanged)

Write test results to a file when the `--json` option is also specified. (https://jestjs.io/docs/cli#--outputfilefilename)

Will not fail if no tests are found (for example while using `--testPathPattern`.) (https://jestjs.io/docs/cli#--passwithnotests)

Run tests with specified reporters. Reporter options are not available via CLI. Example with multiple reporters: `jest --reporters="default" --reporters="jest-junit"`. (https://jestjs.io/docs/cli#--reporters)

Run all tests serially in the current process (rather than creating a worker pool of child processes that run tests). This is sometimes useful for debugging, but such use cases are pretty rare. Useful for CI. (https://jestjs.io/docs/cli#--runinband)

The name of a setup file used by Jest. (use Jest config file https://jestjs.io/docs/en/configuration#setupfilesafterenv-array)

Print your Jest config and then exits. (https://jestjs.io/docs/en/cli#--showconfig)

Prevent tests from printing messages through the console. (https://jestjs.io/docs/cli#--silent)

The build target for the Nx Plugin project.

Adds a location field to test results.  Used to report location of a test in a reporter. { "column": 4, "line": 5 } (https://jestjs.io/docs/cli#--testlocationinresults)

Run only tests with a name that matches the regex pattern. (https://jestjs.io/docs/cli#--testnamepatternregex)

An array of regexp pattern strings that is matched against all tests paths before executing the test. Only run those tests with a path that does not match with the provided regexp expressions. (https://jestjs.io/docs/cli#--testpathignorepatternsregexarray)

An array of regexp pattern strings that is matched against all tests paths before executing the test. (https://jestjs.io/docs/cli#--testpathpatternregex)

Node module that implements a custom results processor. (https://jestjs.io/docs/en/configuration#testresultsprocessor-string)

Default timeout of a test in milliseconds. Default value: `5000`. (https://jestjs.io/docs/cli#--testtimeoutnumber)

The name of the Typescript configuration file. Set the tsconfig option in the jest config file. 

Use this flag to re-record snapshots. Can be used together with a test suite pattern or with `--testNamePattern` to re-record snapshot for test matching the pattern. (https://jestjs.io/docs/cli#--updatesnapshot)

Display individual test results with the test suite hierarchy. (https://jestjs.io/docs/cli#--verbose)

Watch files for changes and rerun tests related to changed files. If you want to re-run all tests when a file has changed, use the `--watchAll` option. (https://jestjs.io/docs/cli#--watch)

Watch files for changes and rerun all tests when something changes. If you want to re-run only the tests that depend on the changed files, use the `--watch` option. (https://jestjs.io/docs/cli#--watchall)

Nx Plugin Playground Target

plugin

The compiler used by the build and test targets.

Test runner to use for end to end (E2E) tests.

How the plugin will be published, like `@myorg/my-awesome-plugin`. Note this must be a valid NPM name.

Generate the plugin with a minimal setup. This would involve not generating a default executor and generator.

Whether or not to configure the ESLint `parserOptions.project` option. We do not do this by default for lint performance reasons.

Do not eslint configuration for plugin json files.

Do not update tsconfig.json for development experience.

Split the project configuration into `<projectRoot>/project.json` rather than including it inside `workspace.json`.

Create a Plugin for Nx

Create a E2E application for a Nx Plugin.

e2e-project

Generate the e2e project with a minimal setup. This would involve not generating tests for a default executor and generator.

the name of the package that would be published to NPM.

the output path of the plugin after it builds.

the directory where the plugin is placed.

Create an E2E app for a Nx Plugin

migration

Generate `libs/my-plugin/src/migrations/my-migration`

Whether or not to include `package.json` updates.

Create a Migration for an Nx Plugin

generator

Generate `libs/my-plugin/src/generators/my-generator`

Create a Generator for an Nx Plugin

executor

Generate `libs/my-plugin/src/executors/my-executor`

Should the boilerplate for a custom hasher be generated?

Create an Executor for an Nx Plugin

Adds linting configuration to validate common json files for nx plugins.

plugin-lint-checks

Which project should be the configuration be added to?

@nrwl/nx-plugin:e2e-project

Usage

Options

jestConfig

minimal

npmPackageName

pluginName

projectDirectory

pluginOutputPath

standaloneConfig

tsSpecConfig