fix(plugin-tools): add missing types and utils for the "loader" plugins

.changeset/angry-houses-chew.md

@@ -0,0 +1,5 @@
+---
+'@emigrate/plugin-tools': patch
+---
+
+Add missing types and utility methods related to the new "loader" plugins

packages/plugin-tools/src/index.ts

@@ -5,6 +5,7 @@ import {
   type GeneratorPlugin,
   type StoragePlugin,
   type Plugin,
+  type LoaderPlugin,
 } from './types.js';
 
 export const isGeneratorPlugin = (plugin: any): plugin is GeneratorPlugin => {
@@ -23,6 +24,14 @@ export const isStoragePlugin = (plugin: any): plugin is StoragePlugin => {
   return typeof plugin.initializeStorage === 'function';
 };
 
+export const isLoaderPlugin = (plugin: any): plugin is LoaderPlugin => {
+  if (!plugin || typeof plugin !== 'object') {
+    return false;
+  }
+
+  return typeof plugin.loadMigration === 'function' && Array.isArray(plugin.loadableExtensions);
+};
+
 export const isPluginOfType = <T extends PluginType>(type: T, plugin: any): plugin is PluginFromType<T> => {
   if (type === 'generator') {
     return isGeneratorPlugin(plugin);
@@ -32,6 +41,10 @@ export const isPluginOfType = <T extends PluginType>(type: T, plugin: any): plug
     return isStoragePlugin(plugin);
   }
 
+  if (type === 'loader') {
+    return isLoaderPlugin(plugin);
+  }
+
   throw new Error(`Unknown plugin type: ${type}`);
 };
 

packages/plugin-tools/src/types.ts

@@ -109,7 +109,7 @@ export type LoaderPlugin = {
   loadMigration(migration: MigrationMetadata): Promise<MigrationFunction>;
 };
 
-export type Plugin = StoragePlugin | GeneratorPlugin;
+export type Plugin = StoragePlugin | GeneratorPlugin | LoaderPlugin;
 
 export type PluginType = 'storage' | 'generator' | 'loader';