feat: invoice, estimate and receipt printing.

server/src/lib/Transformer/Transformer.ts

@@ -0,0 +1,64 @@
+import moment from "moment";
+import { isEmpty, isObject, isUndefined } from 'lodash';
+
+export class Transformer {
+  /**
+   * 
+   * @returns 
+   */
+  protected includeAttributes = (): string[] => {
+    return [];
+  }
+
+  /**
+   * 
+   */
+  public transform = (object: any) => {
+    if (Array.isArray(object)) {
+      return object.map(this.getTransformation);
+    } else if (isObject(object)) {
+      return this.getTransformation(object);
+    }
+    return object;
+  };
+
+  /**
+   * 
+   * @param item 
+   * @returns 
+   */
+  protected getTransformation = (item) => {
+    const attributes = this.getIncludeAttributesTransformed(item);
+
+    return {
+      ...!isUndefined(item.toJSON) ? item.toObject() : item,
+      ...attributes
+    };
+  };
+
+  /**
+   * 
+   * @param item 
+   * @returns 
+   */
+  protected getIncludeAttributesTransformed = (item) => {
+    const attributes = this.includeAttributes();    
+
+    return attributes
+      .filter((attribute) => !isUndefined(this[attribute]))
+      .reduce((acc, attribute: string) => {
+        acc[attribute] = this[attribute](item);
+
+        return acc;
+      }, {});
+  }
+
+  /**
+   * 
+   * @param date 
+   * @returns 
+   */
+  protected formatDate(date) {
+    return date ? moment(date).format('YYYY/MM/DD') : '';
+  }
+}