Add-ons configuration loader

Add-ons configuration loader#

Add-ons that are compatible with @plone/registry can load configuration into the configuration registry. @plone/registry reads the value of the main key entry point in the add-on package.json, which specifies the source of the loader. This should be a JavaScript or TypeScript file, such as index.ts or index.js, placed somewhere in your add-on, conventionally at its root.

{
  "main": "index.ts",
}

This file should contain a default export with a function with this signature:

import type { ConfigType } from '@plone/registry';

export default function loadConfig(config: ConfigType) {
  // You can mutate the configuration object in here
  return config;
}

@plone/registry has a helper utility createAddonsLoader which generates the add-ons loader file. That file contains the code needed to load the add-ons configuration of all the registered add-ons, keeping the order in which they were defined.

This loader is a JavaScript file and it is placed in the root of your application. By default, it's called registry.loader.js.

Important

This file is generated and maintained by @plone/registry. You should neither modify it nor add your own styles in here. It will be overwritten in the next bundler run.

The add-ons loader generator is meant to be run before bundling your app or by the bundler itself when it runs. The @plone/registry Vite plugin generates this file, so the framework can load it during app bootstrap time, as shown below.

  const projectRootPath = path.resolve('.');
  const { registry, shadowAliases } = AddonRegistry.init(projectRootPath);

  createAddonsLoader(
    registry.getAddonDependencies(),
    registry.getAddons(),
    { tempInProject: true },
  );

This will create registry.loader.js in the root of your app.

Afterwards, configure your app to load the code during the app bootstrap, as early as possible in both your client and server code, and as a module side-effect, as shown in the following example.

import config from '@plone/registry';
import applyAddonConfiguration from './registry.loader';

applyAddonConfiguration(config);

Note

If you use a Vite-powered framework, use the @plone/registry Vite plugin. If you use a non-Vite framework, you will have to build your own integration. You can take the implementation of the Vite plugin as reference.

Provide optional add-on configurations#

You can export additional configuration functions from your add-ons configuration loader file. The default export is always loaded by @plone/registry, while the named exports are optional for loading as needed.

To specify optional loaders as needed, in the add-on registration, use the name of your add-on, followed by a colon (:), followed by the names of the optional loaders as comma-separated values as shown in the following example.

{
  "name": "my-nice-volto-project",
  "addons": [
    "my-volto-add-on-name:loadOptionalBlocks,overrideSomeDefaultBlock",
    "volto-another-add-on"
  ],
}

Note

The additional comma-separated names should be exported from the add-on configuration loader file. The main configuration function should be exported as the default. An add-on's default configuration method will always be loaded.

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