fix: schema.content might be omitted

references #369

Author: nkt

packages/openapi-typescript/src/transform/header-object.ts

@@ -17,7 +17,7 @@ export default function transformHeaderObject(headerObject: HeaderObject, option
 
   if (headerObject.content) {
     const type: ts.TypeElement[] = [];
-    for (const [contentType, mediaTypeObject] of getEntries(headerObject.content, options.ctx)) {
+    for (const [contentType, mediaTypeObject] of getEntries(headerObject.content ?? {}, options.ctx)) {
       const nextPath = `${options.path ?? "#"}/${escapePointer(contentType)}`;
       const mediaType =
         "$ref" in mediaTypeObject

packages/openapi-typescript/src/transform/request-body-object.ts

@@ -14,7 +14,7 @@ export default function transformRequestBodyObject(
   options: TransformNodeOptions,
 ): ts.TypeNode {
   const type: ts.TypeElement[] = [];
-  for (const [contentType, mediaTypeObject] of getEntries(requestBodyObject.content, options.ctx)) {
+  for (const [contentType, mediaTypeObject] of getEntries(requestBodyObject.content ?? {}, options.ctx)) {
     const nextPath = createRef([options.path, contentType]);
     const mediaType =
       "$ref" in mediaTypeObject

packages/openapi-typescript/src/transform/response-object.ts

@@ -74,7 +74,7 @@ export default function transformResponseObject(
   // content
   const contentObject: ts.TypeElement[] = [];
   if (responseObject.content) {
-    for (const [contentType, mediaTypeObject] of getEntries(responseObject.content, options.ctx)) {
+    for (const [contentType, mediaTypeObject] of getEntries(responseObject.content ?? {}, options.ctx)) {
       const property = ts.factory.createPropertySignature(
         /* modifiers     */ tsModifiers({ readonly: options.ctx.immutable }),
         /* name          */ tsPropertyIndex(contentType),