feat(nestjs): migrate to NestJS

packages/server/src/modules/Import/ImportableRegistry.ts

@@ -0,0 +1,46 @@
+import { camelCase, upperFirst } from 'lodash';
+import { Importable } from './Importable';
+
+export class ImportableRegistry {
+  private static instance: ImportableRegistry;
+  private importables: Record<string, Importable>;
+
+  constructor() {
+    this.importables = {};
+  }
+
+  /**
+   * Gets singleton instance of registry.
+   * @returns {ImportableRegistry}
+   */
+  public static getInstance(): ImportableRegistry {
+    if (!ImportableRegistry.instance) {
+      ImportableRegistry.instance = new ImportableRegistry();
+    }
+    return ImportableRegistry.instance;
+  }
+
+  /**
+   * Registers the given importable service.
+   * @param {string} resource 
+   * @param {Importable} importable 
+   */
+  public registerImportable(resource: string, importable: Importable): void {
+    const _resource = this.sanitizeResourceName(resource);
+    this.importables[_resource] = importable;
+  }
+
+  /**
+   * Retrieves the importable service instance of the given resource name.
+   * @param {string} name 
+   * @returns {Importable}
+   */
+  public getImportable(name: string): Importable {
+    const _name = this.sanitizeResourceName(name);
+    return this.importables[_name];
+  }
+
+  private sanitizeResourceName(resource: string) {
+    return upperFirst(camelCase(resource));
+  }
+}