add defaultMaping to discriminator

Author: tatomyr

packages/core/src/types/oas3_2.ts

@@ -165,6 +165,14 @@ const MediaType: NodeType = {
   },
 };
 
+const Discriminator: NodeType = {
+  ...Oas3_1Types.Discriminator,
+  properties: {
+    ...Oas3_1Types.Discriminator.properties,
+    defaultMapping: { type: 'string' },
+  },
+};
+
 const Example: NodeType = {
   ...Oas3_1Types.Example,
   properties: {
@@ -184,5 +192,6 @@ export const Oas3_2Types = {
   Parameter,
   Response,
   MediaType,
+  Discriminator,
   Example,
 } as const;

packages/core/src/typings/openapi.ts

@@ -215,6 +215,7 @@ export interface Oas3Webhooks<T extends Oas3Schema | Oas3_1Schema> {
 export interface Oas3Discriminator {
   propertyName: string;
   mapping?: { [name: string]: string };
+  defaultMapping?: string; // added in OAS 3.2
   'x-explicitMappingOnly'?: boolean;
 }