api-ref: custom API reference (#4770)

* initialized next.js project

* finished markdown sections

* added operation schema component

* change page metadata

* eslint fixes

* fixes related to deployment

* added response schema

* resolve max stack issue

* support for different property types

* added support for property types

* added loading for components

* added more loading

* type fixes

* added oneOf type

* removed console

* fix replace with push

* refactored everything

* use static content for description

* fixes and improvements

* added code examples section

* fix path name

* optimizations

* fixed tag navigation

* add support for admin and store references

* general enhancements

* optimizations and fixes

* fixes and enhancements

* added search bar

* loading enhancements

* added loading

* added code blocks

* added margin top

* add empty response text

* fixed oneOf parameters

* added path and query parameters

* general fixes

* added base path env variable

* small fix for arrays

* enhancements

* design enhancements

* general enhancements

* fix isRequired

* added enum values

* enhancements

* general fixes

* general fixes

* changed oas generation script

* additions to the introduction section

* added copy button for code + other enhancements

* fix response code block

* fix metadata

* formatted store introduction

* move sidebar logic to Tags component

* added test env variables

* fix code block bug

* added loading animation

* added expand param + loading

* enhance operation loading

* made responsive + improvements

* added loading provider

* fixed loading

* adjustments for small devices

* added sidebar label for endpoints

* added feedback component

* fixed analytics

* general fixes

* listen to scroll for other headings

* added sample env file

* update api ref files + support new fields

* fix for external docs link

* added new sections

* fix last item in sidebar not showing

* move docs content to www/docs

* change redirect url

* revert change

* resolve build errors

* configure rewrites

* changed to environment variable url

* revert changing environment variable name

* add environment variable for API path

* fix links

* fix tailwind settings

* remove vercel file

* reconfigured api route

* move api page under api

* fix page metadata

* fix external link in navigation bar

* update api spec

* updated api specs

* fixed google lint error

* add max-height on request samples

* add padding before loading

* fix for one of name

* fix undefined types

* general fixes

* remove response schema example

* redesigned navigation bar

* redesigned sidebar

* fixed up paddings

* added feedback component + report issue

* fixed up typography, padding, and general styling

* redesigned code blocks

* optimization

* added error timeout

* fixes

* added indexing with algolia + fixes

* fix errors with algolia script

* redesign operation sections

* fix heading scroll

* design fixes

* fix padding

* fix padding + scroll issues

* fix scroll issues

* improve scroll performance

* fixes for safari

* optimization and fixes

* fixes to docs + details animation

* padding fixes for code block

* added tab animation

* fixed incorrect link

* added selection styling

* fix lint errors

* redesigned details component

* added detailed feedback form

* api reference fixes

* fix tabs

* upgrade + fixes

* updated documentation links

* optimizations to sidebar items

* fix spacing in sidebar item

* optimizations and fixes

* fix endpoint path styling

* remove margin

* final fixes

* change margin on small devices

* generated OAS

* fixes for mobile

* added feedback modal

* optimize dark mode button

* fixed color mode useeffect

* minimize dom size

* use new style system

* radius and spacing design system

* design fixes

* fix eslint errors

* added meta files

* change cron schedule

* fix docusaurus configurations

* added operating system to feedback data

* change content directory name

* fixes to contribution guidelines

* revert renaming content

* added api-reference to documentation workflow

* fixes for search

* added dark mode + fixes

* oas fixes

* handle bugs

* added code examples for clients

* changed tooltip text

* change authentication to card

* change page title based on selected section

* redesigned mobile navbar

* fix icon colors

* fix key colors

* fix medusa-js installation command

* change external regex in algolia

* change changeset

* fix padding on mobile

* fix hydration error

* update depedencies
This commit is contained in:
Shahed Nasser
2023-08-15 18:07:54 +03:00
committed by GitHub
parent 16249ec280
commit 914d773d3a
3270 changed files with 22075 additions and 192064 deletions
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---
description: 'Learn how to create a plugin in Medusa. This guide explains how to develop, configure, and test a plugin.'
addHowToData: true
---
import DocCardList from '@theme/DocCardList';
import Icons from '@theme/Icon';
# How to Create a Plugin
In this document, youll learn how to create a plugin and some tips for develoment. If youre interested to learn more about what plugins are and where to find available official and community plugins, check out the [overview document](./overview.mdx).
## Prerequisites
You must have an existing Medusa project that you want to create the plugin with.
The recommended way to create a plugin is using the `new` command from Medusa CLI:
```bash
npx @medusajs/medusa-cli@latest new medusa-plugin-custom
```
Where `medusa-plugin-custom` is the name of the plugin youre creating. In Medusa, plugins are named based on their functionalities.
By convention, all plugin names start with `medusa` followed by a descriptive name of what the plugin does. For example, the Stripe plugin is named `medusa-payment-stripe`.
---
## Changes to package.json
### Package Name
By default, your package name in `package.json` will be `medusa-starter-default`. This should instead be the name of your plugin. For example, the Stripe plugin's package name is `medusa-payment-stripe`.
### Change Dependencies
A basic Medusa backend installed with the `medusa new` command has dependencies that are necessary for the backend, but not necessary for plugins.
For example, can remove the dependencies `medusa-fulfillment-manual`, `medusa-payment-manual`, and `medusa-payment-stripe` as they are fulfillment and payment plugins necessary for a Medusa backend, but not for a plugin. The same goes for modules like `@medusajs/cache-inmemory`.
Additionally, you can remove `@medusajs/medusa-cli` as you dont need to use the Medusa CLI while developing a plugin.
You should also add `@medusajs/medusa` as a peer dependency:
```json
"peerDependencies": {
"@medusajs/medusa": "YOUR_MEDUSA_VERSION",
// other peer dependencies...
}
```
Where `YOUR_MEDUSA_VERSION` is the version you're using of the Medusa core package. You should be able to find it under `devDependencies`.
Once youre done making these changes, re-run the install command to update your `node_modules` directory:
```bash npm2yarn
npm install
```
Then, make sure to remove the plugins and modules you removed from `medusa-config.js`:
```js title=medusa-config.js
// previously had plugins
const plugins = []
// previously had modules
const modules = {}
```
### Changes for Admin Plugins
:::note
Admin customizations are currently in beta and require you to use the `beta` version of `@medusajs/admin` and `@medusajs/medusa`. You can install them with the following command:
```bash npm2yarn
npm install @medusajs/admin@beta @medusajs/medusa@beta
```
:::
If your plugin contains customizations to the admin dashboard, it's recommended to create different `tsconfig` files for backend and admin customizations, then modify the scripts in `package.json` to handle building backend and admin customizations separately.
:::note
These changes may already be available in your Medusa project. They're included here for reference purposes.
:::
Start by updating your `tsconfig.json` with the following configurations:
```json title=tsconfig.json
{
"compilerOptions": {
"target": "es2019",
"module": "commonjs",
"allowJs": true,
"checkJs": false,
"jsx": "react-jsx",
"declaration": true,
"outDir": "./dist",
"rootDir": "./src",
"experimentalDecorators": true,
"emitDecoratorMetadata": true,
"noEmit": false,
"strict": false,
"moduleResolution": "node",
"esModuleInterop": true,
"resolveJsonModule": true,
"skipLibCheck": true,
"forceConsistentCasingInFileNames": true
},
"include": ["src/"],
"exclude": [
"dist",
"build",
".cache",
"tests",
"**/*.spec.js",
"**/*.spec.ts",
"node_modules",
".eslintrc.js"
]
}
```
The important changes to note here are the inclusion of the field `"jsx": "react-jsx"` and the addition of `"build"` and `“.cache”` to `exclude`.
The addition of `"jsx": "react-jsx"` specified how should TypeScript transform JSX, and excluding `build` and `.cache` ensures that TypeScript ignores build and development files.
Next, create the file `tsconfig.server.json` with the following content:
```json title=tsconfig.server.json
{
"extends": "./tsconfig.json",
"compilerOptions": {
/* Emit a single file with source maps instead of having a separate file. */
"inlineSourceMap": true
},
"exclude": ["src/admin", "**/*.spec.js"]
}
```
This is the configuration that will be used to transpile your custom backend code, such as services or entities. The important part is that it excludes `src/admin` as that is where your Admin code will live.
Then, create the file `tsconfig.admin.json` with the following content:
```json title=tsconfig.admin.json
{
"extends": "./tsconfig.json",
"compilerOptions": {
"module": "esnext"
},
"include": ["src/admin"],
"exclude": ["**/*.spec.js"]
}
```
This is the configuration that will be used when transpiling your admin code.
Finally, update the `build` scripts in your project and add a new `prepare` command:
```json title=package.json
"scripts": {
// other scripts...
"build": "cross-env npm run clean && npm run build:server && npm run build:admin",
"build:server": "cross-env npm run clean && tsc -p tsconfig.json",
"build:admin": "cross-env medusa-admin build",
"prepare": "cross-env NODE_ENV=production npm run build:server && medusa-admin bundle"
}
```
Each of these scripts do the following:
- `build`: used to build resources for both admin and backend for development. You'll typically use this script during your plugin development.
- `build:server`: used to build backend resources for development.
- `build:admin`: used to build admin resources for development.
- `prepare`: used to build resources for publishing. You'll typically use this script during plugin testing and publishing.
Furthermore, make sure to add `react` to `peerDependencies` along with `react-router-dom` if you're using it:
```json title=package.json
"peerDependencies": {
// other dependencies...
"react": "^18.2.0",
"react-router-dom": "^6.13.0"
}
```
### Delete Irrelevant Files
If you've installed the Medusa backend using the [create-medusa-app](../../create-medusa-app.mdx) command, you might find files under the `src` sub-directories that aren't necessary for your plugin development. For example, `src/model/onboarding.ts` or migrations under the `src/migrations` directory.
Make sure to delete these files if you're not using them in your plugin.
---
## Plugin Development
### Plugin Structure
While developing your plugin, you can create your TypeScript or JavaScript files under the `src` directory. This includes creating services, endpoints, migrations, and other resources.
However, before you test the changes on a Medusa backend or publish your plugin, you must transpile your files and move them either to a `dist` directory or to the root of the plugin's directory.
For example, if you have an endpoint in `src/api/index.js`, after running the `build` or `watch` commands [as defined earlier](#recommended-change-scripts), the file should be transpiled into `dist/api/index.js` in your plugin's root. You can alternative transpile them into the `api/index.js` in your plugin's root.
:::note
It was previously required to output your files into the root of the plugin's directory (for example, `api/index.js` instead of `dist/api/index.js`). As of v1.8, you can either have your files in the root of the directory or under the `dist` directory.
:::
### Development Resources
This guide doesn't cover how to create different files and components. If youre interested in learning how to do that, you can check out these guides:
<DocCardList colSize={6} items={[
{
type: 'link',
href: '/development/entities/create',
label: 'Create an Entity',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create an entity.'
}
},
{
type: 'link',
href: '/development/services/create-service',
label: 'Create a Service',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create a service.'
}
},
{
type: 'link',
href: '/development/endpoints/create',
label: 'Create an Endpoint',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create an endpoint.'
}
},
{
type: 'link',
href: '/development/events/create-subscriber',
label: 'Create a Subscriber',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create a subscriber.'
}
},
{
type: 'link',
href: '/admin/widgets',
label: 'Create an Admin Widget',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create an admin widget.',
badge: {
variant: 'orange',
children: 'Beta'
}
}
},
{
type: 'link',
href: '/admin/routes',
label: 'Create an Admin UI Route',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create an admin UI route.',
badge: {
variant: 'orange',
children: 'Beta'
}
}
},
]} />
If you're developing something specific, such as a payment processor plugin, you can follow one of the following guides to learn how to create different services within your plugin.
<DocCardList colSize={6} items={[
{
type: 'link',
href: '/modules/carts-and-checkout/backend/add-payment-provider',
label: 'Create a Payment Processor',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create a payment processor.'
}
},
{
type: 'link',
href: '/modules/carts-and-checkout/backend/add-fulfillment-provider',
label: 'Create a Fulfillment Provider',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create a fulfillment provider.'
}
},
]} />
<DocCardList colSize={4} items={[
{
type: 'link',
href: '/development/search/create',
label: 'Create a Search Service',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create a search service.'
}
},
{
type: 'link',
href: '/development/file-service/create-file-service',
label: 'Create a File Service',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create a file service.'
}
},
{
type: 'link',
href: '/development/file-service/create-file-service',
label: 'Create a Notification Service',
customProps: {
icon: Icons['academic-cap-solid'],
description: 'Learn how to create a notification service.'
}
},
]} />
### Plugin Options
Plugins often allow developers that will later use them to provide their own option. For example, you can allow developers to specify the API key of a service youre integrating.
Developers that use your plugin will pass options to your plugin in the `plugins` array in `medusa-config.js`:
```js title=medusa-config.js
const plugins = [
// ...
{
resolve: `medusa-plugin-custom`,
options: {
name: "My Store",
},
},
]
```
In your plugin's services, you can have access to the option in their constructor. The options are passed as a second parameter to the `constructor` method.
For example:
```js title=src/service/my.ts
// In a service in your plugin
class MyService extends TransactionBaseService {
constructor(container, options) {
super(container)
// options contains plugin options
this.name = options.name
}
// ...
}
```
You can also access the options in your plugin's endpoints. The second parameter that the function declared in `src/api/index.ts` receives is an object including your plugin's configrations.
For example:
```js title=src/api/index.ts
// in an endpoint in your plugin
export default (rootDirectory, options) => {
// options contain the plugin options
const router = Router()
router.get("/hello-world", (req, res) => {
res.json({
message:
`Welcome to ${options.name ? options.name : "Medusa"}!`,
})
})
return router
}
```
:::tip
Make sure to include in the README of your plugin the options that can be passed to a plugin.
:::
### enableUI Plugin Option
All plugins accept an option named `enableUI`. This option is useful mainly if your plugin contains admin customizations. It allows users to enable or disable admin customizations in the admin dashboard.
A developer using your plugin can pass the `enableUI` option as part of the plugin's options:
```js title=medusa-config.js
const plugins = [
// ...
{
resolve: `medusa-plugin-custom`,
options: {
// other options
enableUI: true,
},
},
]
```
If you're passing your plugin options to third-party services, make sure to omit it from the plugin options you receive in your resources, such as services. The `enableUI` option will always be passed as part of your plugin options.
For example:
```js title=src/service/test.ts
// In a service in your plugin
class MyService extends TransactionBaseService {
constructor(container, options) {
super(container)
// options contains plugin options
const { enableUI, ...otherOptions } = options
// pass otherOptions to a third-party service
const client = new Client(otherOptions)
}
// ...
}
```
:::note
Since admin customizations are still in `beta` mode, `enableUI`'s default value is `false` if not provided by the plugin users. This means that it must be enabled manually in a plugin's option for the customizations to appear in the admin dashboard. Once the admin customizations are out of beta, this behavior will be reversed.
:::
---
## Test Your Plugin
While you develop your plugin, youll need to test it on an actual Medusa backend. This can be done using the [npm link](https://docs.npmjs.com/cli/v8/commands/npm-link) command.
### Step 1: Build Changes
<Tabs groupId="plugin-preference">
<TabItem value="without-admin" label="Without Admin Customizations" default>
In the root of your plugin directory, run the `build` command:
```bash
npm run build
```
</TabItem>
<TabItem value="with-admin" label="With Admin Customizations">
In the root of your plugin directory, run the `prepare` command:
```bash
npm run prepare
```
If the `prepare` script is not available in your project, you can find it in [this section](#changes-for-admin-plugins).
</TabItem>
</Tabs>
### Step 2: Link Package
In the root of your plugin directory, run the following command:
```bash npm2yarn
npm link
```
Then, in the directory of the Medusa backend you want to test the plugin on, run the following command:
```bash npm2yarn
npm link medusa-plugin-custom
```
Where `medusa-plugin-custom` is the package name of your plugin.
### Step 3: Remove Medusa Dependency
As your plugin has the `@medusajs/medusa` package installed, and the Medusa backend has `@medusajs/medusa` installed as well, this can cause dependency errors.
To avoid that, remove the `@medusajs` directory from the `node_modules` of your plugin's directory. For Unix-based operating systems you can use the following command:
```bash
rm -rf node_modules/@medusajs
```
### Step 4: Add Plugin to Configurations
In the `medusa-config.js` file of the Medusa backend you're testing the plugin on, add your custom plugin to the `plugins` array:
```js
const plugins = [
// other plugins...
{
resolve: `medusa-plugin-custom`,
options: {
// plugin options...
// if plugin has admin customizations:
enableUI: true,
},
},
]
```
Make sure to change `medusa-plugin-custom` with the name of your plugin. Also, if your plugin has admin customizations, make sure to include the [enableUI](#enableui-plugin-option) option.
### (Optional) Step 5: Run Migrations
If your plugin includes migrations, run the following command in the Medusa backend's directory:
```bash
npx medusa migrations run
```
### Step 6: Run the Medusa Backend
In the directory of the Medusa backend, start the backend with the `dev` command passing it the `--preserve-symlinks` option:
```bash npm2yarn
npm run dev -- -- --preserve-symlinks
```
### Making Changes to the Plugin
While testing your plugin, if you need to make changes you need to re-install the plugin's dependencies:
```bash npm2yarn
npm install
```
Then, after making the changes, run the steps [one](#step-1-build-changes), [three](#step-3-remove-medusa-dependency), and [six](#step-6-run-the-medusa-backend) mentioned above.
### Troubleshoot Errors
#### Error: The class must be a valid service implementation
Please make sure that your plugin is following the correct structure. If the error persists then please try the following fix:
```bash npm2yarn
cd <BACKEND_PATH>/node_modules/medusa-interfaces
npm link
cd <BACKEND_PATH>/node_modules/@medusajs/medusa
npm link
cd <PLUGIN_PATH>
rm -rf node_modules/medusa-interfaces
rm -rf node_modules/@medusajs/medusa
npm link medusa-interfaces
npm link @medusajs/medusa
npm link
cd <BACKEND_PATH>
npm link your-plugin
```
Where `<BACKEND_PATH>` is the path to your Medusa backend and `<PLUGIN_PATH>` is the path to your plugin.
This links the `medusa-interfaces` and `@medusajs/medusa` packages from your `medusa-backend` to your plugin directory and then links your plugin to your `medusa-backend`.
#### APIs not loading
If the APIs you added to your Medussa backend are not loading then please try the following steps:
```bash npm2yarn
cd <PLUGIN_PATH>
rm -rf node_modules
cd <BACKEND_PATH>/node_modules/<PLUGIN_NAME>
npm install
cd <PLUGIN_PATH>
npm run build
cd <BACKEND_PATH>
npm run start
```
Where `<BACKEND_PATH>` is the path to your Medusa backend, `<PLUGIN_PATH>` is the path to your plugin and `<PLUGIN_NAME>` is the name of your plugin as it is in your plugin `package.json` file.
---
## Publish Plugin
Once you're done with the development of the plugin, you can publish it to NPM so that other Medusa developers and users can use it.
Please refer to [this guide on required steps to publish a plugin](./publish.mdx).