feat: Fall back to an alternate string if operationId is undefined.

Author: Himenon

src/generateValidRootSchema.ts

@@ -0,0 +1,16 @@
+import type * as Types from "./types";
+
+export const generateValidRootSchema = (input: Types.OpenApi.Document): Types.OpenApi.Document => {
+  if (!input.paths) {
+    return input;
+  }
+  /** update undefined operation id */
+  for (const [path, methods] of Object.entries(input.paths || {})) {
+    for (const [method, operation] of Object.entries(methods || {})) {
+      if (!operation.operationId) {
+        operation.operationId = `${method.toLowerCase()}${path.charAt(0).toUpperCase() + path.slice(1)}`;
+      }
+    }
+  }
+  return input;
+};

src/index.ts

@@ -2,6 +2,7 @@ import { EOL } from "os";
 
 import * as Api from "./api";
 import type * as Types from "./types";
+import { generateValidRootSchema } from "./generateValidRootSchema";
 
 export interface Option {
   allowOperationIds?: string[];
@@ -17,7 +18,7 @@ export class CodeGenerator {
     private option?: Option,
   ) {
     if (typeof entryPointOrDocument === "string") {
-      this.rootSchema = Api.FileSystem.loadJsonOrYaml(entryPointOrDocument);
+      this.rootSchema = generateValidRootSchema(Api.FileSystem.loadJsonOrYaml(entryPointOrDocument));
       this.resolvedReferenceDocument = Api.ResolveReference.resolve(
         entryPointOrDocument,
         entryPointOrDocument,