[typescript-fetch] Make FormData optional (#6077)

Check "typeof FormData" first. This allows the code to also work in
nodejs with isomorphic-fetch.

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

@@ -50,7 +50,7 @@ export class BaseAPI {
             // do not handle correctly sometimes.
             url += '?' + this.configuration.queryParamsStringify(context.query);
         }
-        const body = (context.body instanceof FormData || context.body instanceof URLSearchParams || isBlob(context.body))
+        const body = ((typeof FormData !== "undefined" && context.body instanceof FormData) || context.body instanceof URLSearchParams || isBlob(context.body))
 	    ? context.body
 	    : JSON.stringify(context.body);
 

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

@@ -61,7 +61,7 @@ export class BaseAPI {
             // do not handle correctly sometimes.
             url += '?' + this.configuration.queryParamsStringify(context.query);
         }
-        const body = (context.body instanceof FormData || context.body instanceof URLSearchParams || isBlob(context.body))
+        const body = ((typeof FormData !== "undefined" && context.body instanceof FormData) || context.body instanceof URLSearchParams || isBlob(context.body))
 	    ? context.body
 	    : JSON.stringify(context.body);
 

samples/client/petstore/typescript-fetch/builds/es6-target/src/runtime.ts

@@ -61,7 +61,7 @@ export class BaseAPI {
             // do not handle correctly sometimes.
             url += '?' + this.configuration.queryParamsStringify(context.query);
         }
-        const body = (context.body instanceof FormData || context.body instanceof URLSearchParams || isBlob(context.body))
+        const body = ((typeof FormData !== "undefined" && context.body instanceof FormData) || context.body instanceof URLSearchParams || isBlob(context.body))
 	    ? context.body
 	    : JSON.stringify(context.body);
 

samples/client/petstore/typescript-fetch/builds/multiple-parameters/runtime.ts

@@ -61,7 +61,7 @@ export class BaseAPI {
             // do not handle correctly sometimes.
             url += '?' + this.configuration.queryParamsStringify(context.query);
         }
-        const body = (context.body instanceof FormData || context.body instanceof URLSearchParams || isBlob(context.body))
+        const body = ((typeof FormData !== "undefined" && context.body instanceof FormData) || context.body instanceof URLSearchParams || isBlob(context.body))
 	    ? context.body
 	    : JSON.stringify(context.body);
 

samples/client/petstore/typescript-fetch/builds/prefix-parameter-interfaces/src/runtime.ts

@@ -61,7 +61,7 @@ export class BaseAPI {
             // do not handle correctly sometimes.
             url += '?' + this.configuration.queryParamsStringify(context.query);
         }
-        const body = (context.body instanceof FormData || context.body instanceof URLSearchParams || isBlob(context.body))
+        const body = ((typeof FormData !== "undefined" && context.body instanceof FormData) || context.body instanceof URLSearchParams || isBlob(context.body))
 	    ? context.body
 	    : JSON.stringify(context.body);
 

samples/client/petstore/typescript-fetch/builds/typescript-three-plus/src/runtime.ts

@@ -61,7 +61,7 @@ export class BaseAPI {
             // do not handle correctly sometimes.
             url += '?' + this.configuration.queryParamsStringify(context.query);
         }
-        const body = (context.body instanceof FormData || context.body instanceof URLSearchParams || isBlob(context.body))
+        const body = ((typeof FormData !== "undefined" && context.body instanceof FormData) || context.body instanceof URLSearchParams || isBlob(context.body))
 	    ? context.body
 	    : JSON.stringify(context.body);
 

samples/client/petstore/typescript-fetch/builds/with-interfaces/runtime.ts

@@ -61,7 +61,7 @@ export class BaseAPI {
             // do not handle correctly sometimes.
             url += '?' + this.configuration.queryParamsStringify(context.query);
         }
-        const body = (context.body instanceof FormData || context.body instanceof URLSearchParams || isBlob(context.body))
+        const body = ((typeof FormData !== "undefined" && context.body instanceof FormData) || context.body instanceof URLSearchParams || isBlob(context.body))
 	    ? context.body
 	    : JSON.stringify(context.body);
 

samples/client/petstore/typescript-fetch/builds/with-npm-version/src/runtime.ts

@@ -61,7 +61,7 @@ export class BaseAPI {
             // do not handle correctly sometimes.
             url += '?' + this.configuration.queryParamsStringify(context.query);
         }
-        const body = (context.body instanceof FormData || context.body instanceof URLSearchParams || isBlob(context.body))
+        const body = ((typeof FormData !== "undefined" && context.body instanceof FormData) || context.body instanceof URLSearchParams || isBlob(context.body))
 	    ? context.body
 	    : JSON.stringify(context.body);