fix(typescript-fetch): add anyToJSON to runtime.ts

  The generated API code calls anyToJSON() for any-typed properties in
  form data, but the function was never defined in runtime.ts, causing
  a ReferenceError at runtime.

  Fixes #1877

Author: mstojanovic8

modules/openapi-generator/src/main/resources/typescript-fetch/apis.mustache

@@ -279,7 +279,7 @@ export class {{classname}} extends runtime.BaseAPI {
             {{^isEnumRef}}
             {{^withoutRuntimeChecks}}
             {{^isContainer}}
-            formParams.append('{{baseName}}', new Blob([JSON.stringify({{{dataType}}}ToJSON(requestParameters['{{paramName}}']))], { type: "application/json", }));
+            formParams.append('{{baseName}}', new Blob([JSON.stringify({{#isFreeFormObject}}runtime.anyToJSON{{/isFreeFormObject}}{{^isFreeFormObject}}{{{dataType}}}ToJSON{{/isFreeFormObject}}(requestParameters['{{paramName}}']))], { type: "application/json", }));
             {{/isContainer}}
             {{#isContainer}}
             formParams.append('{{baseName}}', new Blob([JSON.stringify(requestParameters['{{paramName}}'])], { type: "application/json", }));

modules/openapi-generator/src/main/resources/typescript-fetch/runtime.mustache

@@ -357,6 +357,11 @@ export function mapValues(data: any, fn: (item: any) => any) {
     }
     return result;
 }
+
+// Pass-through serializer for `any`-typed properties in form data. See #1877.
+export function anyToJSON(value: any): any {
+    return value;
+}
 {{/withoutRuntimeChecks}}
 
 export function canConsumeForm(consumes: Consume[]): boolean {

modules/openapi-generator/src/test/resources/3_0/typescript-fetch/any_type_property.json

@@ -0,0 +1,39 @@
+{
+  "openapi": "3.0.1",
+  "info": {
+    "title": "Any Type Property Test",
+    "version": "1.0.0"
+  },
+  "paths": {
+    "/upload": {
+      "post": {
+        "operationId": "uploadFile",
+        "tags": ["Upload"],
+        "requestBody": {
+          "content": {
+            "application/x-www-form-urlencoded": {
+              "schema": {
+                "type": "object",
+                "required": ["name"],
+                "properties": {
+                  "name": {
+                    "type": "string"
+                  },
+                  "file": {
+                    "type": "object"
+                  }
+                }
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Success"
+          }
+        }
+      }
+    }
+  },
+  "components": {}
+}

samples/client/others/typescript-fetch/additional-properties-in-multipart-issue/runtime.ts

@@ -367,6 +367,11 @@ export function mapValues(data: any, fn: (item: any) => any) {
     return result;
 }
 
+// Pass-through serializer for `any`-typed properties in form data. See #1877.
+export function anyToJSON(value: any): any {
+    return value;
+}
+
 export function canConsumeForm(consumes: Consume[]): boolean {
     for (const consume of consumes) {
         if (consume.contentType?.startsWith('multipart/form-data') == true) {

samples/client/others/typescript-fetch/infinite-recursion-issue/runtime.ts

@@ -367,6 +367,11 @@ export function mapValues(data: any, fn: (item: any) => any) {
     return result;
 }
 
+// Pass-through serializer for `any`-typed properties in form data. See #1877.
+export function anyToJSON(value: any): any {
+    return value;
+}
+
 export function canConsumeForm(consumes: Consume[]): boolean {
     for (const consume of consumes) {
         if (consume.contentType?.startsWith('multipart/form-data') == true) {

samples/client/others/typescript-fetch/multipart-file-array/runtime.ts

@@ -367,6 +367,11 @@ export function mapValues(data: any, fn: (item: any) => any) {
     return result;
 }
 
+// Pass-through serializer for `any`-typed properties in form data. See #1877.
+export function anyToJSON(value: any): any {
+    return value;
+}
+
 export function canConsumeForm(consumes: Consume[]): boolean {
     for (const consume of consumes) {
         if (consume.contentType?.startsWith('multipart/form-data') == true) {

samples/client/others/typescript-fetch/self-import-issue/runtime.ts

@@ -367,6 +367,11 @@ export function mapValues(data: any, fn: (item: any) => any) {
     return result;
 }
 
+// Pass-through serializer for `any`-typed properties in form data. See #1877.
+export function anyToJSON(value: any): any {
+    return value;
+}
+
 export function canConsumeForm(consumes: Consume[]): boolean {
     for (const consume of consumes) {
         if (consume.contentType?.startsWith('multipart/form-data') == true) {

samples/client/petstore/typescript-fetch/builds/allOf-nullable/runtime.ts

@@ -367,6 +367,11 @@ export function mapValues(data: any, fn: (item: any) => any) {
     return result;
 }
 
+// Pass-through serializer for `any`-typed properties in form data. See #1877.
+export function anyToJSON(value: any): any {
+    return value;
+}
+
 export function canConsumeForm(consumes: Consume[]): boolean {
     for (const consume of consumes) {
         if (consume.contentType?.startsWith('multipart/form-data') == true) {

samples/client/petstore/typescript-fetch/builds/allOf-readonly/runtime.ts

@@ -367,6 +367,11 @@ export function mapValues(data: any, fn: (item: any) => any) {
     return result;
 }
 
+// Pass-through serializer for `any`-typed properties in form data. See #1877.
+export function anyToJSON(value: any): any {
+    return value;
+}
+
 export function canConsumeForm(consumes: Consume[]): boolean {
     for (const consume of consumes) {
         if (consume.contentType?.startsWith('multipart/form-data') == true) {

samples/client/petstore/typescript-fetch/builds/default-v3.0/runtime.ts

@@ -367,6 +367,11 @@ export function mapValues(data: any, fn: (item: any) => any) {
     return result;
 }
 
+// Pass-through serializer for `any`-typed properties in form data. See #1877.
+export function anyToJSON(value: any): any {
+    return value;
+}
+
 export function canConsumeForm(consumes: Consume[]): boolean {
     for (const consume of consumes) {
         if (consume.contentType?.startsWith('multipart/form-data') == true) {