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195 lines
6.9 KiB
Markdown
195 lines
6.9 KiB
Markdown
---
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description: 'Learn how to perform local development in the Medusa monorepo. This includes how to use the dev CLI tool and perform unit, integration, and plugin tests.'
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---
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# Local Development of Medusa Server and Monorepo
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In this document, you’ll learn how to customize Medusa’s core and run tests.
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## Overview
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As an open-source platform, Medusa’s core can be completely customized.
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Whether you want to implement something differently, introduce a new future as part of Medusa’s core or any of the other packages, or contribute to Medusa, this guide helps you learn how to run Medusa’s integration tests, as well as test your own Medusa core in a local server.
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### Medusa Repository Overview
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[Medusa’s repository on GitHub](https://github.com/medusajs/medusa) includes all packages related to Medusa under the [`packages` directory](https://github.com/medusajs/medusa/tree/master/packages). This includes the [core Medusa server](https://github.com/medusajs/medusa/tree/master/packages/medusa), the [JS Client](https://github.com/medusajs/medusa/tree/master/packages/medusa-js), the CLI tools, and much more.
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All the packages are part of a [Yarn workspace](https://classic.yarnpkg.com/lang/en/docs/workspaces/). So, when you run a command in the root of the project, such as `yarn build`, it goes through all registered packages in the workspace under the `packages` directory and runs the `build` command in each of those packages.
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---
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## Prerequisites
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### Yarn
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When using and developing with the Medusa repository, it’s highly recommended that you use [Yarn](https://yarnpkg.com/getting-started/install) to avoid any errors or issues.
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### Fork and Clone Medusa’s Repository
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To customize Medusa’s core or contribute to it, you must first [fork](https://docs.github.com/en/get-started/quickstart/fork-a-repo) and then [clone](https://docs.github.com/en/get-started/quickstart/fork-a-repo#cloning-your-forked-repository) the [GitHub repository](https://github.com/medusajs/medusa).
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### Install Dependencies and Build Packages
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In the directory of the forked GitHub repository, run the following commands to install necessary dependencies then build all packages in the repository:
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```bash
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yarn install
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yarn build
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```
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### Medusa’s Dev CLI tool
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Medusa provides a CLI tool to be used for development. This tool facilitates testing your local installment and changes to Medusa’s core without having to publish the changes to NPM.
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To install Medusa’s dev CLI tool:
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```bash npm2yarn
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npm install medusa-dev-cli -g
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```
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### Set the Location of the Medusa Repository
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In the directory of your forked GitHub repository, run the following command to specify to the dev CLI tool the location of your Medusa repository:
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```bash
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medusa-dev --set-path-to-repo `pwd`
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```
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---
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## Run Tests in the Repository
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In this section, you’ll learn how to run tests in the Medusa repository. This is helpful after you customize any of Medusa’s packages and want to make sure everything is still working as expected.
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### Set System Environment Variables
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Before you can run the tests, make sure you set the following system environment variables:
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```bash
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DB_HOST=<YOUR_DB_HOST>
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DB_USERNAME=<YOUR_DB_USERNAME>
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DB_PASSWORD=<YOUR_PASSWORD>
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```
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### Run Unit Tests
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To run unit tests in all packages in the Medusa repository, run the following command in the root directory of the repository:
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```bash
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yarn test
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```
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This runs the `test` script defined in the `package.json` file of each package under the `packages` directory.
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Alternatively, if you want to run the unit tests in a specific package, you can run the `test` command in the directory of that package.
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For example, to run the unit tests of the Medusa core:
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```bash
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cd packages/medusa
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yarn test
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```
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### Run API Integration Tests
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API integration tests are used to test out Medusa’s core endpoints.
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To run the API integration tests, run the following command in the root directory of the repository:
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```bash
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yarn test:integration:api
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```
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### Run Plugin Integration Tests
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Plugin integration tests are used to test out Medusa’s official plugins, which are also stored in the `packages` directory in the repository.
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To run the plugin integration tests, run the following command in the root directory of the repository:
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```bash
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yarn test:integration:plugins
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```
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---
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## Test in a Local Server
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Using Medusa’s dev CLI tool, you can test any changes you make to Medusa’s packages in a local server installation. This eliminates the need to publish these packages on NPM publicly to be able to use them.
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Medusa’s dev CLI tool scans and finds the Medusa packages used in your Medusa server. Then, it copies the files of these packages from the `packages` directory in the Medusa repository into the `node_modules` directory of your Medusa server.
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:::info
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Medusa’s Dev CLI tool uses the [path you specified earlier](#set-the-location-of-the-medusa-repository) to copy the files of the packages.
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:::
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### Copy Files to Local Server
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To test in a local server:
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1. Change to the directory of the server you want to test your changes in:
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```bash
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cd medusa-server
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```
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2\. Run the following command to copy the files from the `packages` directory of your Medusa repository into `node_modules`:
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```bash
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medusa-dev
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```
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By default, Medusa’s dev CLI runs in watch mode. So, it copies the files when you first run it. Then, whenever you make changes in the `dist` directory of the packages in the Medusa repository, it copies the changed files again.
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### Watch and Compile Changes
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While the above command is running, it's recommended to run the `watch` command inside the directory of every package you're making changes to.
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The combination of these two commands running at the same time will compile the package into the `dist` directory of the package, then copy the compiled changes into your local server.
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For example, if you're making changes in the `medusa` package, run the following command inside the directory of the `medusa` package:
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```bash title=packages/medusa
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yarn watch
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```
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Make sure the `medusa-dev` command is also running to copy the changes automatically.
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Alternatively, you can manually run the `build` command every time you want to compile the changes:
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```bash title=packages/medusa
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yarn build
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```
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### CLI Options
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Here are some options you can use to customize how Medusa’s dev CLI tool works:
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- `--scan-once` or `-s`: Copies files only one time then stops processing. If you make any changes after running the command with this option, you have to run the command again.
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```bash
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medusa-dev -s
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```
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- `--quiet` or `-q`: Disables showing any output.
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```bash
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medusa-dev -q
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```
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- `--packages`: Only copies specified packages. It accepts at least one package name. Package names are separated by a space.
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```bash
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medusa-dev --packages @medusajs/medusa-cli medusa-file-minio
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```
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---
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## See Also
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- [Create a Plugin](../advanced/backend/plugins/create.md)
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- [Contribution Guidelines](https://github.com/medusajs/medusa/blob/master/CONTRIBUTING.md)
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