Plugin

To add more features to a Platformatic service, you will need to register a plugin, which will be in the form of a standard Fastify plugin.

Configuration

The config file specifies where the plugin file is located. The path is relative to the config file path.

platformatic.json

{
  ...
  "plugins": {
    "paths": ["./plugin/index.js"]
  }
}

You should export an async function which receives the following parameters:

• app (FastifyInstance) the main fastify instance
• opts all the options specified in the config file after path

Hot Reload

The plugin file is watched by the fs.watch function.

You don't need to reload the Platformatic Service server while working on your plugin. Every time you save, the watcher will trigger a reload event, and the server will auto-restart and load your updated code.

info

On Linux, file watch in subdirectories is not supported due to a Node.js limitation (documented here).

Directories

The path can also be a directory. In that case, the directory will be loaded with @fastify/autoload.

Example Directory Structure

├── routes
│   ├── foo
│   │   ├── something.js
│   │   └── bar
│   │       └── baz.js
│   ├── single-plugin
│   │   └── utils.js
│   └── another-plugin.js
└── platformatic.service.json

By default the folder will be added as a prefix to all the routes defined within them. See the autoload documentation for all the options to customize this behavior.

Multiple Plugins

Multiple plugins can be loaded in parallel by specifying an array:

{
  ...
  "plugins": {
    "paths": [{
      "path": "./plugin/index.js"
    }, {
      "path": "./routes/"
    }]
  }
}

TypeScript and Autocompletion

To provide the correct typings of the features added by Platformatic Service to your Fastify instance, add the following at the top of your files:

/// <references types="@platformatic/service" />

Plugin definition with TypeScript

Here is an example of writing a plugin in TypeScript:

/// <reference types="@platformatic/service" />
import { FastifyInstance, FastifyPluginOptions } from 'fastify'

export default async function (fastify: FastifyInstance, opts: FastifyPluginOptions) {
}

Note that you need to add the "typescript": true configuration to your platformatic.service.json.

Loading compiled files

Setting "typescript": false but including a tsconfig.json with an outDir option, will instruct Platformatic Service to try loading your plugins from that folder instead. This setup supports pre-compiled sources to reduce cold start time during deployment.

Example Configuration

{
  "typescript": false,
  "plugins": {
    "paths": [
      { "path": "./dist/plugin.js" }
    ]
  }
}