fix(transform): avoid duplicate enum declaration when using root types with no prefix

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

@@ -80,6 +80,9 @@ export default function transformComponentsObject(componentsObject: ComponentsOb
           }
           const ref = ts.factory.createTypeReferenceNode(`components['${key}']['${name}']`);
           if (ctx.rootTypesNoSchemaPrefix && key === "schemas") {
+            if (ctx.enum && item.enum) {
+              continue;
+            }
             aliasName = aliasName.replace(componentKey, "");
           }
           const typeAlias = ts.factory.createTypeAliasDeclaration(

packages/openapi-typescript/test/transform/schema-object/enum.test.ts

@@ -0,0 +1,136 @@
+import { fileURLToPath } from "node:url";
+import { transformSchema } from "../../../src/index.js";
+import { astToString } from "../../../src/lib/ts.js";
+import type { GlobalContext } from "../../../src/types.js";
+import { DEFAULT_CTX, type TestCase } from "../../test-helpers.js";
+
+const DEFAULT_OPTIONS = DEFAULT_CTX;
+
+describe("transformComponentsObject", () => {
+  const tests: TestCase<any, GlobalContext>[] = [
+    [
+      "options > rootTypes: true and rootTypesNoSchemaPrefix: true",
+      {
+        given: {
+          openapi: "3.0.0",
+          info: {
+            title: "Status API",
+            version: "1.0.0",
+          },
+          paths: {
+            "/status": {
+              get: {
+                summary: "Get current status",
+                responses: {
+                  "200": {
+                    description: "Status response",
+                    content: {
+                      "application/json": {
+                        schema: {
+                          $ref: "#/components/schemas/StatusResponse",
+                        },
+                      },
+                    },
+                  },
+                },
+              },
+            },
+          },
+          components: {
+            schemas: {
+              StatusResponse: {
+                type: "object",
+                properties: {
+                  status: {
+                    $ref: "#/components/schemas/Status",
+                  },
+                },
+              },
+              Status: {
+                type: "string",
+                enum: ["pending", "active", "done"],
+              },
+            },
+          },
+        },
+        want: `export interface paths {
+    "/status": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /** Get current status */
+        get: {
+            parameters: {
+                query?: never;
+                header?: never;
+                path?: never;
+                cookie?: never;
+            };
+            requestBody?: never;
+            responses: {
+                /** @description Status response */
+                200: {
+                    headers: {
+                        [name: string]: unknown;
+                    };
+                    content: {
+                        "application/json": components["schemas"]["StatusResponse"];
+                    };
+                };
+            };
+        };
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
+}
+export type webhooks = Record<string, never>;
+export interface components {
+    schemas: {
+        StatusResponse: {
+            status?: components["schemas"]["Status"];
+        };
+        /** @enum {string} */
+        Status: Status;
+    };
+    responses: never;
+    parameters: never;
+    requestBodies: never;
+    headers: never;
+    pathItems: never;
+}
+export type StatusResponse = components['schemas']['StatusResponse'];
+export type $defs = Record<string, never>;
+export enum Status {
+    pending = "pending",
+    active = "active",
+    done = "done"
+}
+export type operations = Record<string, never>;`,
+        options: { ...DEFAULT_OPTIONS, enum: true, rootTypes: true, rootTypesNoSchemaPrefix: true },
+      },
+    ],
+  ];
+
+  for (const [testName, { given, want, options, ci }] of tests) {
+    test.skipIf(ci?.skipIf)(
+      testName,
+      async () => {
+        const result = astToString(transformSchema(given, options ?? DEFAULT_OPTIONS));
+        if (want instanceof URL) {
+          await expect(result).toMatchFileSnapshot(fileURLToPath(want));
+        } else {
+          expect(result.trim()).toBe(want.trim());
+        }
+      },
+      ci?.timeout,
+    );
+  }
+});