Track multiple responses per API (elastic#1468)

Author: delvedor

compiler/src/model/build-model.ts

@@ -313,28 +313,34 @@ function compileClassOrInterfaceDeclaration (declaration: ClassDeclaration | Int
         body: { kind: 'no_body' }
       }
 
-      for (const member of declaration.getMembers()) {
-        // we are visiting `path_parts, `query_parameters` or `body`
+      for (const status of declaration.getMembers()) {
         assert(
-          member,
-          Node.isPropertyDeclaration(member) || Node.isPropertySignature(member),
+          status,
+          Node.isPropertyDeclaration(status) || Node.isPropertySignature(status),
           'Class and interfaces can only have property declarations or signatures'
         )
-        const property = visitRequestOrResponseProperty(member)
-        if (property.name === 'body') {
-          // the body can either by a value (eg Array<string> or an object with properties)
-          if (property.valueOf != null) {
-            if (property.valueOf.kind === 'instance_of' && property.valueOf.type.name === 'Void') {
-              type.body = { kind: 'no_body' }
+        status.getTypeNode()?.forEachChild(child => {
+          assert(
+            child,
+            Node.isPropertySignature(child) || Node.isPropertyDeclaration(child),
+            `Children should be ${ts.SyntaxKind[ts.SyntaxKind.PropertySignature]} or ${ts.SyntaxKind[ts.SyntaxKind.PropertyDeclaration]} but is ${ts.SyntaxKind[child.getKind()]} instead`
+          )
+          const property = visitRequestOrResponseProperty(child)
+          if (property.name === 'body') {
+            // the body can either by a value (eg Array<string> or an object with properties)
+            if (property.valueOf != null) {
+              if (property.valueOf.kind === 'instance_of' && property.valueOf.type.name === 'Void') {
+                type.body = { kind: 'no_body' }
+              } else {
+                type.body = { kind: 'value', value: property.valueOf }
+              }
             } else {
-              type.body = { kind: 'value', value: property.valueOf }
+              type.body = { kind: 'properties', properties: property.properties }
             }
           } else {
-            type.body = { kind: 'properties', properties: property.properties }
+            assert(child, false, 'Response.body is the only Response property supported')
           }
-        } else {
-          assert(member, false, 'Response.body is the only Response property supported')
-        }
+        })
       }
     }