fix

samples/openapi3/client/petstore/typescript/tests/default/test/http/isomorphic-fetch.test.ts

@@ -1,7 +1,7 @@
 import * as petstore from "ts-petstore-client";
 
 import { expect} from "chai";
-import * as FormData from "form-data";
+import FormData from "form-data";
 
 let libs: { [key: string]: petstore.HttpLibrary } = {
     "isomorphic-fetch": new petstore.IsomorphicFetchHttpLibrary()
@@ -68,4 +68,4 @@ for (let libName in libs) {
             }).catch(done)
         })
     })
-}
+}

samples/openapi3/client/petstore/typescript/tests/default/tsconfig.json

@@ -1,5 +1,6 @@
 {
     "compilerOptions": {
+        "esModuleInterop": true,
         "module": "commonjs",
         "target": "es6",
         "noImplicitAny": true,