Support for making references to schema properties

src/load.ts

@@ -147,8 +147,17 @@ export default async function load(schemaURL: URL, options: LoadOptions): Promis
           return `external["${relativeURL}"]["${parts.join('"]["')}"]`; // export external ref
         }
 
+        // References to properties of schemas like `#/components/schemas/Pet/properties/name`
+        // requires the components to be wrapped in a `properties` object. But to keep
+        // backwards compatibility we should instead just remove the `properties` part.
+        // For us to recognize the `properties` part it simply has to be the second last.
+        if (parts[parts.length - 2] === "properties") {
+          parts.splice(parts.length - 2, 1);
+        }
+
         // scenario 3: transform all $refs pointing back to root schema
         const [base, ...rest] = parts;
+
         return `${base}["${rest.join('"]["')}"]`; // transform other $refs to the root schema (including external refs that point back to the root schema)
       });
 

tests/v2/expected/reference-to-properties.immutable.ts

@@ -0,0 +1,34 @@
+/**
+ * This file was auto-generated by openapi-typescript.
+ * Do not make direct changes to the file.
+ */
+
+export interface paths {
+  readonly "/pet": {
+    readonly post: operations["addPet"];
+  };
+}
+
+export interface definitions {
+  readonly Pet: {
+    readonly id?: number;
+    readonly name: string;
+  };
+}
+
+export interface operations {
+  readonly addPet: {
+    readonly parameters: {
+      readonly body: {
+        readonly body: {
+          readonly name?: definitions["Pet"]["name"];
+        };
+      };
+    };
+    readonly responses: {
+      readonly 200: unknown;
+    };
+  };
+}
+
+export interface external {}

tests/v2/expected/reference-to-properties.ts

@@ -0,0 +1,34 @@
+/**
+ * This file was auto-generated by openapi-typescript.
+ * Do not make direct changes to the file.
+ */
+
+export interface paths {
+  "/pet": {
+    post: operations["addPet"];
+  };
+}
+
+export interface definitions {
+  Pet: {
+    id?: number;
+    name: string;
+  };
+}
+
+export interface operations {
+  addPet: {
+    parameters: {
+      body: {
+        body: {
+          name?: definitions["Pet"]["name"];
+        };
+      };
+    };
+    responses: {
+      200: unknown;
+    };
+  };
+}
+
+export interface external {}

tests/v2/specs/reference-to-properties.yaml

@@ -0,0 +1,43 @@
+swagger: "2.0"
+info:
+  description: ""
+  version: "1.0.0"
+  title: "Swagger Petstore"
+  termsOfService: "http://swagger.io/terms/"
+  contact:
+    email: "[email protected]"
+  license:
+    name: "Apache 2.0"
+    url: "http://www.apache.org/licenses/LICENSE-2.0.html"
+paths:
+  /pet:
+    post:
+      operationId: "addPet"
+      consumes:
+        - "application/json"
+      produces:
+        - "application/json"
+      parameters:
+        - in: "body"
+          name: "body"
+          description: ""
+          required: true
+          schema:
+            properties:
+              name:
+                $ref: "#/definitions/Pet/properties/name"
+      responses:
+        200:
+          description: ""
+definitions:
+  Pet:
+    type: "object"
+    required:
+      - "name"
+    properties:
+      id:
+        type: "integer"
+        format: "int64"
+      name:
+        type: "string"
+        example: "doggie"

tests/v3/expected/reference-to-properties.additional.ts

@@ -0,0 +1,35 @@
+/**
+ * This file was auto-generated by openapi-typescript.
+ * Do not make direct changes to the file.
+ */
+
+export interface paths {
+  "/pet": {
+    put: operations["updatePet"];
+  };
+}
+
+export interface components {
+  schemas: {
+    Pet: {
+      name: string;
+    } & { [key: string]: any };
+  };
+}
+
+export interface operations {
+  updatePet: {
+    responses: {
+      200: unknown;
+    };
+    requestBody: {
+      content: {
+        "application/json": {
+          name?: components["schemas"]["Pet"]["name"];
+        } & { [key: string]: any };
+      };
+    };
+  };
+}
+
+export interface external {}

tests/v3/expected/reference-to-properties.immutable.ts

@@ -0,0 +1,35 @@
+/**
+ * This file was auto-generated by openapi-typescript.
+ * Do not make direct changes to the file.
+ */
+
+export interface paths {
+  readonly "/pet": {
+    readonly put: operations["updatePet"];
+  };
+}
+
+export interface components {
+  readonly schemas: {
+    readonly Pet: {
+      readonly name: string;
+    };
+  };
+}
+
+export interface operations {
+  readonly updatePet: {
+    readonly responses: {
+      readonly 200: unknown;
+    };
+    readonly requestBody: {
+      readonly content: {
+        readonly "application/json": {
+          readonly name?: components["schemas"]["Pet"]["name"];
+        };
+      };
+    };
+  };
+}
+
+export interface external {}

tests/v3/expected/reference-to-properties.ts

@@ -0,0 +1,35 @@
+/**
+ * This file was auto-generated by openapi-typescript.
+ * Do not make direct changes to the file.
+ */
+
+export interface paths {
+  "/pet": {
+    put: operations["updatePet"];
+  };
+}
+
+export interface components {
+  schemas: {
+    Pet: {
+      name: string;
+    };
+  };
+}
+
+export interface operations {
+  updatePet: {
+    responses: {
+      200: unknown;
+    };
+    requestBody: {
+      content: {
+        "application/json": {
+          name?: components["schemas"]["Pet"]["name"];
+        };
+      };
+    };
+  };
+}
+
+export interface external {}

tests/v3/specs/reference-to-properties.yaml

@@ -0,0 +1,38 @@
+openapi: 3.0.1
+info:
+  title: Spec with reference to proeprties
+  description: ''
+  termsOfService: http://swagger.io/terms/
+  contact:
+    email: [email protected]
+  license:
+    name: Apache 2.0
+    url: http://www.apache.org/licenses/LICENSE-2.0.html
+  version: 1.0.0
+paths:
+  /pet:
+    put:
+      summary: ''
+      operationId: updatePet
+      requestBody:
+        description: ''
+        content:
+          application/json:
+            schema:
+              properties:
+                name:
+                  $ref: '#/components/schemas/Pet/properties/name'
+        required: true
+      responses:
+        200:
+          description: ''
+          content: {}
+components:
+  schemas:
+    Pet:
+      required:
+        - name
+      type: object
+      properties:
+        name:
+          type: string