Implement support for ING transfers

src/util/parser.ts

@@ -0,0 +1,66 @@
+export function mapCombine<T extends object, E>(
+  items: T[],
+  property: keyof T,
+  map: (item: T) => E,
+  combine: (a: T, b: T) => E | undefined,  
+): E[] {
+  // Helper function to check if a value is nullish
+  const isNullish = (value: any): boolean => 
+    value === undefined || 
+    value === null || 
+    (typeof value === 'string' && value.trim() === '');
+
+  const result: Array<{
+    value: T | E;
+    combined: boolean;
+    skip: boolean;
+  }> = items.map(item => ({
+    value: item,
+    combined: false,
+    skip: false
+  }));
+  
+  for (let i = 0; i < result.length; i++) {
+    if (result[i].combined || result[i].skip) continue;
+    
+    const propValueI = (result[i].value as T)[property];
+    if (isNullish(propValueI)) continue; // Skip items with nullish property values
+    
+    for (let j = i + 1; j < result.length; j++) {
+      if (result[j].skip) continue;
+      
+      const propValueJ = (result[j].value as T)[property];
+      if (isNullish(propValueJ)) continue; // Skip if second item has nullish property
+      
+      if (propValueI === propValueJ) {
+        const combinedValue = combine(result[i].value as T, result[j].value as T);
+        
+        if (combinedValue !== undefined) {
+          result[i].value = combinedValue;
+          result[i].combined = true;
+          result[j].skip = true;
+          break;
+        }
+      }
+    }
+  }
+  
+  return result
+    .filter(item => !item.skip)
+    .map(item => item.combined ? item.value as E : map(item.value as T));
+}
+
+
+export function parseAmount(input?: string): number|undefined {    
+  if (input === undefined) {
+    return undefined;
+  }  
+
+  const v = Number.parseFloat(input.replaceAll(",", "."));  
+  
+  if (isNaN(v)) {
+    return undefined;
+  }
+
+  return v;
+}