[CDX-390]: update FilterNode to union type

Author: niizom

src/types/index.d.ts

@@ -215,11 +215,18 @@ export type FilterExpressionRange = {
 
 export type FilterExpressionRangeValue = ['-inf' | number, 'inf' | number];
 
-export interface FilterNode {
+export interface VariationsMapSingleFilter {
   field: string;
   value: string | number | boolean;
 }
 
+export interface VariationsMapRange {
+  field: string;
+  value: [number, number];
+}
+
+export type FilterNode = VariationsMapSingleFilter | VariationsMapRange;
+
 export interface FilterBy {
   and?: Array<FilterNode | FilterBy>;
   or?: Array<FilterNode | FilterBy>;