diff --git a/samples/freee.json b/samples/freee.json
index ccd6e98..6c511a6 100644
--- a/samples/freee.json
+++ b/samples/freee.json
@@ -18666,15 +18666,8 @@
                     "type": "string"
                   },
                   "receipt": {
-                    "description": "証憑ファイル",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "証憑ファイル"
                   }
                 },
                 "required": [
@@ -26226,226 +26219,6 @@
           "type",
           "webkitRelativePath"
         ]
-      },
-      "ReadStream": {
-        "description": "Instances of `fs.ReadStream` are created and returned using the {@link createReadStream} function.",
-        "type": "object",
-        "properties": {
-          "bytesRead": {
-            "description": "The number of bytes that have been read so far.",
-            "type": "number"
-          },
-          "path": {
-            "description": "The path to the file the stream is reading from as specified in the first\nargument to `fs.createReadStream()`. If `path` is passed as a string, then`readStream.path` will be a string. If `path` is passed as a `Buffer`, then`readStream.path` will be a\n`Buffer`. If `fd` is specified, then`readStream.path` will be `undefined`.",
-            "anyOf": [
-              {
-                "type": "object",
-                "additionalProperties": false,
-                "patternProperties": {
-                  "^[0-9]+$": {
-                    "type": "number"
-                  }
-                },
-                "properties": {
-                  "BYTES_PER_ELEMENT": {
-                    "type": "number"
-                  },
-                  "buffer": {
-                    "$ref": "#/components/schemas/ArrayBufferLike"
-                  },
-                  "byteLength": {
-                    "type": "number"
-                  },
-                  "byteOffset": {
-                    "type": "number"
-                  },
-                  "length": {
-                    "type": "number"
-                  },
-                  "__@toStringTag@138753": {
-                    "type": "string",
-                    "const": "Uint8Array"
-                  }
-                },
-                "required": [
-                  "BYTES_PER_ELEMENT",
-                  "__@toStringTag@138753",
-                  "buffer",
-                  "byteLength",
-                  "byteOffset",
-                  "length"
-                ]
-              },
-              {
-                "type": "string"
-              }
-            ]
-          },
-          "pending": {
-            "description": "This property is `true` if the underlying file has not been opened yet,\ni.e. before the `'ready'` event is emitted.",
-            "type": "boolean"
-          },
-          "readableAborted": {
-            "description": "Returns whether the stream was destroyed or errored before emitting `'end'`.",
-            "type": "boolean"
-          },
-          "readable": {
-            "description": "Is `true` if it is safe to call {@link read}, which means\nthe stream has not been destroyed or emitted `'error'` or `'end'`.",
-            "type": "boolean"
-          },
-          "readableDidRead": {
-            "description": "Returns whether `'data'` has been emitted.",
-            "type": "boolean"
-          },
-          "readableEncoding": {
-            "description": "Getter for the property `encoding` of a given `Readable` stream. The `encoding` property can be set using the {@link setEncoding} method.",
-            "anyOf": [
-              {
-                "enum": [
-                  "ascii",
-                  "base64",
-                  "base64url",
-                  "binary",
-                  "hex",
-                  "latin1",
-                  "ucs-2",
-                  "ucs2",
-                  "utf-16le",
-                  "utf-8",
-                  "utf16le",
-                  "utf8"
-                ],
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "readableEnded": {
-            "description": "Becomes `true` when [`'end'`](https://nodejs.org/docs/latest-v22.x/api/stream.html#event-end) event is emitted.",
-            "type": "boolean"
-          },
-          "readableFlowing": {
-            "description": "This property reflects the current state of a `Readable` stream as described\nin the [Three states](https://nodejs.org/docs/latest-v22.x/api/stream.html#three-states) section.",
-            "type": [
-              "null",
-              "boolean"
-            ]
-          },
-          "readableHighWaterMark": {
-            "description": "Returns the value of `highWaterMark` passed when creating this `Readable`.",
-            "type": "number"
-          },
-          "readableLength": {
-            "description": "This property contains the number of bytes (or objects) in the queue\nready to be read. The value provides introspection data regarding\nthe status of the `highWaterMark`.",
-            "type": "number"
-          },
-          "readableObjectMode": {
-            "description": "Getter for the property `objectMode` of a given `Readable` stream.",
-            "type": "boolean"
-          },
-          "destroyed": {
-            "description": "Is `true` after `readable.destroy()` has been called.",
-            "type": "boolean"
-          },
-          "closed": {
-            "description": "Is `true` after `'close'` has been emitted.",
-            "type": "boolean"
-          },
-          "errored": {
-            "description": "Returns error if the stream has been destroyed with an error.",
-            "anyOf": [
-              {
-                "$ref": "#/components/schemas/Error"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "bytesRead",
-          "closed",
-          "destroyed",
-          "errored",
-          "path",
-          "pending",
-          "readable",
-          "readableAborted",
-          "readableDidRead",
-          "readableEncoding",
-          "readableEnded",
-          "readableFlowing",
-          "readableHighWaterMark",
-          "readableLength",
-          "readableObjectMode"
-        ]
-      },
-      "ArrayBufferLike": {
-        "anyOf": [
-          {
-            "$ref": "#/components/schemas/ArrayBuffer"
-          },
-          {
-            "$ref": "#/components/schemas/SharedArrayBuffer"
-          }
-        ]
-      },
-      "ArrayBuffer": {
-        "type": "object",
-        "properties": {
-          "byteLength": {
-            "type": "number"
-          },
-          "__@toStringTag@138753": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "__@toStringTag@138753",
-          "byteLength"
-        ]
-      },
-      "SharedArrayBuffer": {
-        "type": "object",
-        "properties": {
-          "byteLength": {
-            "type": "number"
-          },
-          "__@species@139211": {
-            "$ref": "#/components/schemas/SharedArrayBuffer"
-          },
-          "__@toStringTag@138753": {
-            "type": "string",
-            "const": "SharedArrayBuffer"
-          }
-        },
-        "required": [
-          "__@species@139211",
-          "__@toStringTag@138753",
-          "byteLength"
-        ]
-      },
-      "Error": {
-        "type": "object",
-        "properties": {
-          "name": {
-            "type": "string"
-          },
-          "message": {
-            "type": "string"
-          },
-          "stack": {
-            "type": "string"
-          },
-          "cause": {}
-        },
-        "required": [
-          "message",
-          "name"
-        ]
       }
     }
   }
diff --git a/samples/freee/@types/index.ts b/samples/freee/@types/index.ts
index 2d7d5d7..d506d10 100644
--- a/samples/freee/@types/index.ts
+++ b/samples/freee/@types/index.ts
@@ -1,6 +1,4 @@
 /* eslint-disable */
-import type { ReadStream } from 'fs'
-
 export type PaymentParams = {
   /** 事業所ID */
   company_id: number;
@@ -578,7 +576,7 @@ export type ReceiptCreateParams = {
   /** 取引日 (yyyy-mm-dd) */
   issue_date?: string | undefined;
   /** 証憑ファイル */
-  receipt: (File | ReadStream);
+  receipt: File;
 }
 
 export type ReceiptUpdateParams = {
diff --git a/samples/openapi.json b/samples/openapi.json
index 5a314a6..c2dd942 100644
--- a/samples/openapi.json
+++ b/samples/openapi.json
@@ -639,15 +639,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Image to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Image to upload."
                   },
                   "rightholder": {
                     "type": "string"
@@ -1548,15 +1541,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Audio to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Audio to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -1636,15 +1622,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Image to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Image to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -1898,15 +1877,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Video to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Video to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -3397,15 +3369,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Audio to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Audio to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -3477,15 +3442,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Image to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Image to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -3724,15 +3682,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Video to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Video to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -3849,15 +3800,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "audio to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "audio to upload."
                   }
                 },
                 "required": [
@@ -3905,15 +3849,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Image to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Image to upload."
                   }
                 },
                 "required": [
@@ -4049,15 +3986,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Audio to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Audio to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -4129,15 +4059,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Image to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Image to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -4251,27 +4174,13 @@
                     "type": "number"
                   },
                   "video": {
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File"
                   },
                   "audioId": {
                     "type": "number"
                   },
                   "audio": {
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File"
                   },
                   "text": {
                     "type": "string"
@@ -4340,15 +4249,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "Video to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "Video to upload."
                   },
                   "caption": {
                     "type": "string"
@@ -4408,15 +4310,8 @@
                 "type": "object",
                 "properties": {
                   "file": {
-                    "description": "video to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File",
+                    "description": "video to upload."
                   }
                 },
                 "required": [
@@ -5661,14 +5556,7 @@
                   },
                   "image": {
                     "description": "Profile picture to upload.",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File"
                   },
                   "imageId": {
                     "type": "string"
@@ -6032,226 +5920,6 @@
           "type",
           "webkitRelativePath"
         ]
-      },
-      "ReadStream": {
-        "description": "Instances of `fs.ReadStream` are created and returned using the {@link createReadStream} function.",
-        "type": "object",
-        "properties": {
-          "bytesRead": {
-            "description": "The number of bytes that have been read so far.",
-            "type": "number"
-          },
-          "path": {
-            "description": "The path to the file the stream is reading from as specified in the first\nargument to `fs.createReadStream()`. If `path` is passed as a string, then`readStream.path` will be a string. If `path` is passed as a `Buffer`, then`readStream.path` will be a\n`Buffer`. If `fd` is specified, then`readStream.path` will be `undefined`.",
-            "anyOf": [
-              {
-                "type": "object",
-                "additionalProperties": false,
-                "patternProperties": {
-                  "^[0-9]+$": {
-                    "type": "number"
-                  }
-                },
-                "properties": {
-                  "BYTES_PER_ELEMENT": {
-                    "type": "number"
-                  },
-                  "buffer": {
-                    "$ref": "#/components/schemas/ArrayBufferLike"
-                  },
-                  "byteLength": {
-                    "type": "number"
-                  },
-                  "byteOffset": {
-                    "type": "number"
-                  },
-                  "length": {
-                    "type": "number"
-                  },
-                  "__@toStringTag@188024": {
-                    "type": "string",
-                    "const": "Uint8Array"
-                  }
-                },
-                "required": [
-                  "BYTES_PER_ELEMENT",
-                  "__@toStringTag@188024",
-                  "buffer",
-                  "byteLength",
-                  "byteOffset",
-                  "length"
-                ]
-              },
-              {
-                "type": "string"
-              }
-            ]
-          },
-          "pending": {
-            "description": "This property is `true` if the underlying file has not been opened yet,\ni.e. before the `'ready'` event is emitted.",
-            "type": "boolean"
-          },
-          "readableAborted": {
-            "description": "Returns whether the stream was destroyed or errored before emitting `'end'`.",
-            "type": "boolean"
-          },
-          "readable": {
-            "description": "Is `true` if it is safe to call {@link read}, which means\nthe stream has not been destroyed or emitted `'error'` or `'end'`.",
-            "type": "boolean"
-          },
-          "readableDidRead": {
-            "description": "Returns whether `'data'` has been emitted.",
-            "type": "boolean"
-          },
-          "readableEncoding": {
-            "description": "Getter for the property `encoding` of a given `Readable` stream. The `encoding` property can be set using the {@link setEncoding} method.",
-            "anyOf": [
-              {
-                "enum": [
-                  "ascii",
-                  "base64",
-                  "base64url",
-                  "binary",
-                  "hex",
-                  "latin1",
-                  "ucs-2",
-                  "ucs2",
-                  "utf-16le",
-                  "utf-8",
-                  "utf16le",
-                  "utf8"
-                ],
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "readableEnded": {
-            "description": "Becomes `true` when [`'end'`](https://nodejs.org/docs/latest-v22.x/api/stream.html#event-end) event is emitted.",
-            "type": "boolean"
-          },
-          "readableFlowing": {
-            "description": "This property reflects the current state of a `Readable` stream as described\nin the [Three states](https://nodejs.org/docs/latest-v22.x/api/stream.html#three-states) section.",
-            "type": [
-              "null",
-              "boolean"
-            ]
-          },
-          "readableHighWaterMark": {
-            "description": "Returns the value of `highWaterMark` passed when creating this `Readable`.",
-            "type": "number"
-          },
-          "readableLength": {
-            "description": "This property contains the number of bytes (or objects) in the queue\nready to be read. The value provides introspection data regarding\nthe status of the `highWaterMark`.",
-            "type": "number"
-          },
-          "readableObjectMode": {
-            "description": "Getter for the property `objectMode` of a given `Readable` stream.",
-            "type": "boolean"
-          },
-          "destroyed": {
-            "description": "Is `true` after `readable.destroy()` has been called.",
-            "type": "boolean"
-          },
-          "closed": {
-            "description": "Is `true` after `'close'` has been emitted.",
-            "type": "boolean"
-          },
-          "errored": {
-            "description": "Returns error if the stream has been destroyed with an error.",
-            "anyOf": [
-              {
-                "$ref": "#/components/schemas/Error"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "bytesRead",
-          "closed",
-          "destroyed",
-          "errored",
-          "path",
-          "pending",
-          "readable",
-          "readableAborted",
-          "readableDidRead",
-          "readableEncoding",
-          "readableEnded",
-          "readableFlowing",
-          "readableHighWaterMark",
-          "readableLength",
-          "readableObjectMode"
-        ]
-      },
-      "ArrayBufferLike": {
-        "anyOf": [
-          {
-            "$ref": "#/components/schemas/ArrayBuffer"
-          },
-          {
-            "$ref": "#/components/schemas/SharedArrayBuffer"
-          }
-        ]
-      },
-      "ArrayBuffer": {
-        "type": "object",
-        "properties": {
-          "byteLength": {
-            "type": "number"
-          },
-          "__@toStringTag@188024": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "__@toStringTag@188024",
-          "byteLength"
-        ]
-      },
-      "SharedArrayBuffer": {
-        "type": "object",
-        "properties": {
-          "byteLength": {
-            "type": "number"
-          },
-          "__@species@188482": {
-            "$ref": "#/components/schemas/SharedArrayBuffer"
-          },
-          "__@toStringTag@188024": {
-            "type": "string",
-            "const": "SharedArrayBuffer"
-          }
-        },
-        "required": [
-          "__@species@188482",
-          "__@toStringTag@188024",
-          "byteLength"
-        ]
-      },
-      "Error": {
-        "type": "object",
-        "properties": {
-          "name": {
-            "type": "string"
-          },
-          "message": {
-            "type": "string"
-          },
-          "stack": {
-            "type": "string"
-          },
-          "cause": {}
-        },
-        "required": [
-          "message",
-          "name"
-        ]
       }
     }
   }
diff --git a/samples/openapi/api/v1/parse/image/index.ts b/samples/openapi/api/v1/parse/image/index.ts
index 55b4d35..992b770 100644
--- a/samples/openapi/api/v1/parse/image/index.ts
+++ b/samples/openapi/api/v1/parse/image/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 
 export type Methods = DefineMethods<{
   post: {
@@ -15,7 +14,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Image to upload. */
-      file: (File | ReadStream);
+      file: File;
       rightholder?: string | undefined;
       statusCopyright?: 'unknown' | 'cc' | 'licensed' | 'sublicensed' | undefined;
     };
diff --git a/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/audio/index.ts b/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/audio/index.ts
index 84f20d8..8529782 100644
--- a/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/audio/index.ts
+++ b/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/audio/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -18,7 +17,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Audio to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       imageId?: string | undefined;
diff --git a/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/image/index.ts b/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/image/index.ts
index 6a8009a..2a4a476 100644
--- a/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/image/index.ts
+++ b/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/image/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -18,7 +17,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Image to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       published?: boolean | undefined;
diff --git a/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/video/index.ts b/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/video/index.ts
index bdf7e4a..7bd7e84 100644
--- a/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/video/index.ts
+++ b/samples/openapi/api/v3/channels/_channelId@string/chats/_chatId@string/items/video/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -18,7 +17,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Video to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       published?: boolean | undefined;
diff --git a/samples/openapi/api/v3/chats/_chatId@string/items/audio/index.ts b/samples/openapi/api/v3/chats/_chatId@string/items/audio/index.ts
index ecad3ee..1d24975 100644
--- a/samples/openapi/api/v3/chats/_chatId@string/items/audio/index.ts
+++ b/samples/openapi/api/v3/chats/_chatId@string/items/audio/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -18,7 +17,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Audio to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       imageId?: string | undefined;
diff --git a/samples/openapi/api/v3/chats/_chatId@string/items/image/index.ts b/samples/openapi/api/v3/chats/_chatId@string/items/image/index.ts
index e0d17ef..2c0efb3 100644
--- a/samples/openapi/api/v3/chats/_chatId@string/items/image/index.ts
+++ b/samples/openapi/api/v3/chats/_chatId@string/items/image/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -18,7 +17,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Image to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       published?: boolean | undefined;
diff --git a/samples/openapi/api/v3/chats/_chatId@string/items/video/index.ts b/samples/openapi/api/v3/chats/_chatId@string/items/video/index.ts
index eab0faa..773063a 100644
--- a/samples/openapi/api/v3/chats/_chatId@string/items/video/index.ts
+++ b/samples/openapi/api/v3/chats/_chatId@string/items/video/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -18,7 +17,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Video to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       published?: boolean | undefined;
diff --git a/samples/openapi/api/v3/extension/audio/index.ts b/samples/openapi/api/v3/extension/audio/index.ts
index fd68a80..1a96965 100644
--- a/samples/openapi/api/v3/extension/audio/index.ts
+++ b/samples/openapi/api/v3/extension/audio/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -17,7 +16,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** audio to upload. */
-      file: (File | ReadStream);
+      file: File;
     };
   };
 }>;
diff --git a/samples/openapi/api/v3/extension/image/index.ts b/samples/openapi/api/v3/extension/image/index.ts
index b690fc3..33ae2f7 100644
--- a/samples/openapi/api/v3/extension/image/index.ts
+++ b/samples/openapi/api/v3/extension/image/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -19,7 +18,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Image to upload. */
-      file: (File | ReadStream);
+      file: File;
     };
   };
 }>;
diff --git a/samples/openapi/api/v3/extension/story/_storyId@string/audio/index.ts b/samples/openapi/api/v3/extension/story/_storyId@string/audio/index.ts
index 2d4d058..da24919 100644
--- a/samples/openapi/api/v3/extension/story/_storyId@string/audio/index.ts
+++ b/samples/openapi/api/v3/extension/story/_storyId@string/audio/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -17,7 +16,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Audio to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       text?: string | undefined;
diff --git a/samples/openapi/api/v3/extension/story/_storyId@string/image/index.ts b/samples/openapi/api/v3/extension/story/_storyId@string/image/index.ts
index 78bd33d..770d098 100644
--- a/samples/openapi/api/v3/extension/story/_storyId@string/image/index.ts
+++ b/samples/openapi/api/v3/extension/story/_storyId@string/image/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -17,7 +16,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Image to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       text?: string | undefined;
diff --git a/samples/openapi/api/v3/extension/story/_storyId@string/index.ts b/samples/openapi/api/v3/extension/story/_storyId@string/index.ts
index 0df0484..9845cce 100644
--- a/samples/openapi/api/v3/extension/story/_storyId@string/index.ts
+++ b/samples/openapi/api/v3/extension/story/_storyId@string/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -31,9 +30,9 @@ export type Methods = DefineMethods<{
       quoteSource?: string | undefined;
       quotePersonHandle?: string | undefined;
       videoId?: number | undefined;
-      video?: (File | ReadStream) | undefined;
+      video?: File | undefined;
       audioId?: number | undefined;
-      audio?: (File | ReadStream) | undefined;
+      audio?: File | undefined;
       text?: string | undefined;
       headline?: string | undefined;
       quoteCreated?: string | undefined;
diff --git a/samples/openapi/api/v3/extension/story/_storyId@string/video/index.ts b/samples/openapi/api/v3/extension/story/_storyId@string/video/index.ts
index 7ff99c2..3ee7a05 100644
--- a/samples/openapi/api/v3/extension/story/_storyId@string/video/index.ts
+++ b/samples/openapi/api/v3/extension/story/_storyId@string/video/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -17,7 +16,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** Video to upload. */
-      file: (File | ReadStream);
+      file: File;
       caption?: string | undefined;
       headline?: string | undefined;
       text?: string | undefined;
diff --git a/samples/openapi/api/v3/extension/video/index.ts b/samples/openapi/api/v3/extension/video/index.ts
index 3131d2b..642a9fd 100644
--- a/samples/openapi/api/v3/extension/video/index.ts
+++ b/samples/openapi/api/v3/extension/video/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -19,7 +18,7 @@ export type Methods = DefineMethods<{
 
     reqBody: {
       /** video to upload. */
-      file: (File | ReadStream);
+      file: File;
     };
   };
 }>;
diff --git a/samples/openapi/api/v3/user/profile/index.ts b/samples/openapi/api/v3/user/profile/index.ts
index 97ff3f8..5572fb4 100644
--- a/samples/openapi/api/v3/user/profile/index.ts
+++ b/samples/openapi/api/v3/user/profile/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../../@types';
 
 export type Methods = DefineMethods<{
@@ -13,7 +12,7 @@ export type Methods = DefineMethods<{
       screenName?: string | undefined;
       url?: string | undefined;
       /** Profile picture to upload. */
-      image?: (File | ReadStream) | undefined;
+      image?: File | undefined;
       imageId?: string | undefined;
     };
   };
diff --git a/samples/simple-openapi.json b/samples/simple-openapi.json
index 0f8381d..181fb5e 100644
--- a/samples/simple-openapi.json
+++ b/samples/simple-openapi.json
@@ -135,14 +135,7 @@
           "content": {
             "application/json": {
               "schema": {
-                "anyOf": [
-                  {
-                    "$ref": "#/components/schemas/File"
-                  },
-                  {
-                    "$ref": "#/components/schemas/ReadStream"
-                  }
-                ]
+                "$ref": "#/components/schemas/File"
               }
             }
           }
@@ -397,226 +390,6 @@
           "type",
           "webkitRelativePath"
         ]
-      },
-      "ReadStream": {
-        "description": "Instances of `fs.ReadStream` are created and returned using the {@link createReadStream} function.",
-        "type": "object",
-        "properties": {
-          "bytesRead": {
-            "description": "The number of bytes that have been read so far.",
-            "type": "number"
-          },
-          "path": {
-            "description": "The path to the file the stream is reading from as specified in the first\nargument to `fs.createReadStream()`. If `path` is passed as a string, then`readStream.path` will be a string. If `path` is passed as a `Buffer`, then`readStream.path` will be a\n`Buffer`. If `fd` is specified, then`readStream.path` will be `undefined`.",
-            "anyOf": [
-              {
-                "type": "object",
-                "additionalProperties": false,
-                "patternProperties": {
-                  "^[0-9]+$": {
-                    "type": "number"
-                  }
-                },
-                "properties": {
-                  "BYTES_PER_ELEMENT": {
-                    "type": "number"
-                  },
-                  "buffer": {
-                    "$ref": "#/components/schemas/ArrayBufferLike"
-                  },
-                  "byteLength": {
-                    "type": "number"
-                  },
-                  "byteOffset": {
-                    "type": "number"
-                  },
-                  "length": {
-                    "type": "number"
-                  },
-                  "__@toStringTag@46242": {
-                    "type": "string",
-                    "const": "Uint8Array"
-                  }
-                },
-                "required": [
-                  "BYTES_PER_ELEMENT",
-                  "__@toStringTag@46242",
-                  "buffer",
-                  "byteLength",
-                  "byteOffset",
-                  "length"
-                ]
-              },
-              {
-                "type": "string"
-              }
-            ]
-          },
-          "pending": {
-            "description": "This property is `true` if the underlying file has not been opened yet,\ni.e. before the `'ready'` event is emitted.",
-            "type": "boolean"
-          },
-          "readableAborted": {
-            "description": "Returns whether the stream was destroyed or errored before emitting `'end'`.",
-            "type": "boolean"
-          },
-          "readable": {
-            "description": "Is `true` if it is safe to call {@link read}, which means\nthe stream has not been destroyed or emitted `'error'` or `'end'`.",
-            "type": "boolean"
-          },
-          "readableDidRead": {
-            "description": "Returns whether `'data'` has been emitted.",
-            "type": "boolean"
-          },
-          "readableEncoding": {
-            "description": "Getter for the property `encoding` of a given `Readable` stream. The `encoding` property can be set using the {@link setEncoding} method.",
-            "anyOf": [
-              {
-                "enum": [
-                  "ascii",
-                  "base64",
-                  "base64url",
-                  "binary",
-                  "hex",
-                  "latin1",
-                  "ucs-2",
-                  "ucs2",
-                  "utf-16le",
-                  "utf-8",
-                  "utf16le",
-                  "utf8"
-                ],
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "readableEnded": {
-            "description": "Becomes `true` when [`'end'`](https://nodejs.org/docs/latest-v22.x/api/stream.html#event-end) event is emitted.",
-            "type": "boolean"
-          },
-          "readableFlowing": {
-            "description": "This property reflects the current state of a `Readable` stream as described\nin the [Three states](https://nodejs.org/docs/latest-v22.x/api/stream.html#three-states) section.",
-            "type": [
-              "null",
-              "boolean"
-            ]
-          },
-          "readableHighWaterMark": {
-            "description": "Returns the value of `highWaterMark` passed when creating this `Readable`.",
-            "type": "number"
-          },
-          "readableLength": {
-            "description": "This property contains the number of bytes (or objects) in the queue\nready to be read. The value provides introspection data regarding\nthe status of the `highWaterMark`.",
-            "type": "number"
-          },
-          "readableObjectMode": {
-            "description": "Getter for the property `objectMode` of a given `Readable` stream.",
-            "type": "boolean"
-          },
-          "destroyed": {
-            "description": "Is `true` after `readable.destroy()` has been called.",
-            "type": "boolean"
-          },
-          "closed": {
-            "description": "Is `true` after `'close'` has been emitted.",
-            "type": "boolean"
-          },
-          "errored": {
-            "description": "Returns error if the stream has been destroyed with an error.",
-            "anyOf": [
-              {
-                "$ref": "#/components/schemas/Error"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "bytesRead",
-          "closed",
-          "destroyed",
-          "errored",
-          "path",
-          "pending",
-          "readable",
-          "readableAborted",
-          "readableDidRead",
-          "readableEncoding",
-          "readableEnded",
-          "readableFlowing",
-          "readableHighWaterMark",
-          "readableLength",
-          "readableObjectMode"
-        ]
-      },
-      "ArrayBufferLike": {
-        "anyOf": [
-          {
-            "$ref": "#/components/schemas/ArrayBuffer"
-          },
-          {
-            "$ref": "#/components/schemas/SharedArrayBuffer"
-          }
-        ]
-      },
-      "ArrayBuffer": {
-        "type": "object",
-        "properties": {
-          "byteLength": {
-            "type": "number"
-          },
-          "__@toStringTag@46242": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "__@toStringTag@46242",
-          "byteLength"
-        ]
-      },
-      "SharedArrayBuffer": {
-        "type": "object",
-        "properties": {
-          "byteLength": {
-            "type": "number"
-          },
-          "__@species@46700": {
-            "$ref": "#/components/schemas/SharedArrayBuffer"
-          },
-          "__@toStringTag@46242": {
-            "type": "string",
-            "const": "SharedArrayBuffer"
-          }
-        },
-        "required": [
-          "__@species@46700",
-          "__@toStringTag@46242",
-          "byteLength"
-        ]
-      },
-      "Error": {
-        "type": "object",
-        "properties": {
-          "name": {
-            "type": "string"
-          },
-          "message": {
-            "type": "string"
-          },
-          "stack": {
-            "type": "string"
-          },
-          "cause": {}
-        },
-        "required": [
-          "message",
-          "name"
-        ]
       }
     }
   }
diff --git a/samples/simple/file/_id@number/upload/index.ts b/samples/simple/file/_id@number/upload/index.ts
index a1c3d24..f0007a2 100644
--- a/samples/simple/file/_id@number/upload/index.ts
+++ b/samples/simple/file/_id@number/upload/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 
 export type Methods = DefineMethods<{
   post: {
@@ -9,6 +8,6 @@ export type Methods = DefineMethods<{
     } | undefined;
 
     status: 204;
-    reqBody: (File | ReadStream);
+    reqBody: File;
   };
 }>;
diff --git a/samples/swagger.json b/samples/swagger.json
index 4552f45..e8588c0 100644
--- a/samples/swagger.json
+++ b/samples/swagger.json
@@ -197,14 +197,7 @@
                   },
                   "file": {
                     "description": "file to upload",
-                    "anyOf": [
-                      {
-                        "$ref": "#/components/schemas/File"
-                      },
-                      {
-                        "$ref": "#/components/schemas/ReadStream"
-                      }
-                    ]
+                    "$ref": "#/components/schemas/File"
                   }
                 }
               }
@@ -997,226 +990,6 @@
           "type",
           "webkitRelativePath"
         ]
-      },
-      "ReadStream": {
-        "description": "Instances of `fs.ReadStream` are created and returned using the {@link createReadStream} function.",
-        "type": "object",
-        "properties": {
-          "bytesRead": {
-            "description": "The number of bytes that have been read so far.",
-            "type": "number"
-          },
-          "path": {
-            "description": "The path to the file the stream is reading from as specified in the first\nargument to `fs.createReadStream()`. If `path` is passed as a string, then`readStream.path` will be a string. If `path` is passed as a `Buffer`, then`readStream.path` will be a\n`Buffer`. If `fd` is specified, then`readStream.path` will be `undefined`.",
-            "anyOf": [
-              {
-                "type": "object",
-                "additionalProperties": false,
-                "patternProperties": {
-                  "^[0-9]+$": {
-                    "type": "number"
-                  }
-                },
-                "properties": {
-                  "BYTES_PER_ELEMENT": {
-                    "type": "number"
-                  },
-                  "buffer": {
-                    "$ref": "#/components/schemas/ArrayBufferLike"
-                  },
-                  "byteLength": {
-                    "type": "number"
-                  },
-                  "byteOffset": {
-                    "type": "number"
-                  },
-                  "length": {
-                    "type": "number"
-                  },
-                  "__@toStringTag@23": {
-                    "type": "string",
-                    "const": "Uint8Array"
-                  }
-                },
-                "required": [
-                  "BYTES_PER_ELEMENT",
-                  "__@toStringTag@23",
-                  "buffer",
-                  "byteLength",
-                  "byteOffset",
-                  "length"
-                ]
-              },
-              {
-                "type": "string"
-              }
-            ]
-          },
-          "pending": {
-            "description": "This property is `true` if the underlying file has not been opened yet,\ni.e. before the `'ready'` event is emitted.",
-            "type": "boolean"
-          },
-          "readableAborted": {
-            "description": "Returns whether the stream was destroyed or errored before emitting `'end'`.",
-            "type": "boolean"
-          },
-          "readable": {
-            "description": "Is `true` if it is safe to call {@link read}, which means\nthe stream has not been destroyed or emitted `'error'` or `'end'`.",
-            "type": "boolean"
-          },
-          "readableDidRead": {
-            "description": "Returns whether `'data'` has been emitted.",
-            "type": "boolean"
-          },
-          "readableEncoding": {
-            "description": "Getter for the property `encoding` of a given `Readable` stream. The `encoding` property can be set using the {@link setEncoding} method.",
-            "anyOf": [
-              {
-                "enum": [
-                  "ascii",
-                  "base64",
-                  "base64url",
-                  "binary",
-                  "hex",
-                  "latin1",
-                  "ucs-2",
-                  "ucs2",
-                  "utf-16le",
-                  "utf-8",
-                  "utf16le",
-                  "utf8"
-                ],
-                "type": "string"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "readableEnded": {
-            "description": "Becomes `true` when [`'end'`](https://nodejs.org/docs/latest-v22.x/api/stream.html#event-end) event is emitted.",
-            "type": "boolean"
-          },
-          "readableFlowing": {
-            "description": "This property reflects the current state of a `Readable` stream as described\nin the [Three states](https://nodejs.org/docs/latest-v22.x/api/stream.html#three-states) section.",
-            "type": [
-              "null",
-              "boolean"
-            ]
-          },
-          "readableHighWaterMark": {
-            "description": "Returns the value of `highWaterMark` passed when creating this `Readable`.",
-            "type": "number"
-          },
-          "readableLength": {
-            "description": "This property contains the number of bytes (or objects) in the queue\nready to be read. The value provides introspection data regarding\nthe status of the `highWaterMark`.",
-            "type": "number"
-          },
-          "readableObjectMode": {
-            "description": "Getter for the property `objectMode` of a given `Readable` stream.",
-            "type": "boolean"
-          },
-          "destroyed": {
-            "description": "Is `true` after `readable.destroy()` has been called.",
-            "type": "boolean"
-          },
-          "closed": {
-            "description": "Is `true` after `'close'` has been emitted.",
-            "type": "boolean"
-          },
-          "errored": {
-            "description": "Returns error if the stream has been destroyed with an error.",
-            "anyOf": [
-              {
-                "$ref": "#/components/schemas/Error"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "bytesRead",
-          "closed",
-          "destroyed",
-          "errored",
-          "path",
-          "pending",
-          "readable",
-          "readableAborted",
-          "readableDidRead",
-          "readableEncoding",
-          "readableEnded",
-          "readableFlowing",
-          "readableHighWaterMark",
-          "readableLength",
-          "readableObjectMode"
-        ]
-      },
-      "ArrayBufferLike": {
-        "anyOf": [
-          {
-            "$ref": "#/components/schemas/ArrayBuffer"
-          },
-          {
-            "$ref": "#/components/schemas/SharedArrayBuffer"
-          }
-        ]
-      },
-      "ArrayBuffer": {
-        "type": "object",
-        "properties": {
-          "byteLength": {
-            "type": "number"
-          },
-          "__@toStringTag@23": {
-            "type": "string"
-          }
-        },
-        "required": [
-          "__@toStringTag@23",
-          "byteLength"
-        ]
-      },
-      "SharedArrayBuffer": {
-        "type": "object",
-        "properties": {
-          "byteLength": {
-            "type": "number"
-          },
-          "__@species@481": {
-            "$ref": "#/components/schemas/SharedArrayBuffer"
-          },
-          "__@toStringTag@23": {
-            "type": "string",
-            "const": "SharedArrayBuffer"
-          }
-        },
-        "required": [
-          "__@species@481",
-          "__@toStringTag@23",
-          "byteLength"
-        ]
-      },
-      "Error": {
-        "type": "object",
-        "properties": {
-          "name": {
-            "type": "string"
-          },
-          "message": {
-            "type": "string"
-          },
-          "stack": {
-            "type": "string"
-          },
-          "cause": {}
-        },
-        "required": [
-          "message",
-          "name"
-        ]
       }
     }
   }
diff --git a/samples/swagger/pet/_petId@number/uploadImage/index.ts b/samples/swagger/pet/_petId@number/uploadImage/index.ts
index 35a8230..5a8a4a5 100644
--- a/samples/swagger/pet/_petId@number/uploadImage/index.ts
+++ b/samples/swagger/pet/_petId@number/uploadImage/index.ts
@@ -1,6 +1,5 @@
 /* eslint-disable */
 import type { DefineMethods } from 'aspida';
-import type { ReadStream } from 'fs';
 import type * as Types from '../../../@types';
 
 export type Methods = DefineMethods<{
@@ -14,7 +13,7 @@ export type Methods = DefineMethods<{
       /** Additional data to pass to server */
       additionalMetadata?: string | undefined;
       /** file to upload */
-      file?: (File | ReadStream) | undefined;
+      file?: File | undefined;
     };
   };
 }>;
diff --git a/tests/index.test.ts b/tests/index.test.ts
new file mode 100644
index 0000000..6ed07af
--- /dev/null
+++ b/tests/index.test.ts
@@ -0,0 +1,26 @@
+import fs from 'fs';
+import { afterAll, beforeAll, describe, expect, test } from 'vitest';
+import build from '../src';
+import type { ConfigFile } from '../src/getConfig';
+
+describe('cli test', () => {
+  beforeAll(() => fs.mkdirSync('_samples'));
+  afterAll(() => fs.promises.rmdir('_samples', { recursive: true }));
+
+  test('main', () => {
+    const configs: ConfigFile[] = require('../aspida.config.js');
+
+    return Promise.all(
+      configs.map(async (config) => {
+        const originalFile = config.openapi?.outputFile ?? `${config.input}.json`;
+        const outputFile = `_${originalFile}`;
+
+        await build({ ...config, openapi: { outputFile } })[0];
+
+        expect(fs.readFileSync(outputFile, 'utf8')).toBe(
+          fs.readFileSync(originalFile, 'utf8').replace(/\r/g, ''),
+        );
+      }),
+    );
+  });
+});