Resolver error

Q&A (please complete the following information)

• OS: Windows 10
• Environment: Node.js v13.4.0
• Method of installation: npm
• Swagger-Client version: 3.10.8
• Swagger/OpenAPI version: OpenAPI 3.0

Content & configuration

Swagger/OpenAPI definition:

The test consists of 3 cross-referenced YAML files: test.yaml (main), which references data types from 2 other YAML files (a.yaml and b.yaml). To perform the test, these 3 files should be placed in the same directory, or URL location.

test.yaml

openapi: 3.0.0
info:
  version: 1.0.0
  title: Title
paths:
  /foo:
    post:
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Body'
      responses:
        '201':
          description: Created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Body'
components:
  schemas:
    Body:
      type: object
      properties:
        p1:
          $ref: 'a.yaml#/components/schemas/A'
        p2:
          $ref: 'b.yaml#/components/schemas/B1'

a.yaml

openapi: 3.0.0
info:
  version: 1.0.0
  title: A
  description: A
paths: {}
components:
  schemas:
    A:
      type: object
      properties:
        p1:
          $ref: 'b.yaml#/components/schemas/B3'

b.yaml

openapi: 3.0.0
info:
  version: 1.0.0
  title: B
  description: B
paths: {}
components:
  schemas:
    B1:
      type: string
    B2:
      type: integer
    B3:
      type: object
      properties:
        p1:
          $ref: '#/components/schemas/B2'

Swagger-Client usage:

import SwaggerClient from 'swagger-client'
new SwaggerClient('https://<server>/test.yaml').then(swaggerClient => {
  console.log(swaggerClient.errors[0].message);
});

Describe the bug you're encountering

The output of the JS script above is:

Could not resolve reference: Could not resolve pointer: /components/schemas/B2 does not exist in document

To reproduce...

Steps to reproduce the behavior:

1. Put the 3 files in a same URL location
2. Execute the JS script above with node.js

Expected behavior

There should not be any error, since all the types can be resolved

Screenshots

Not needed

Additional context or thoughts

The same issue can be tested in the online Swagger Editor, by following the link:
https://editor.swagger.io/?url=https://jdegre.github.io/test/test.yaml
And, right after the test.yaml is loaded, in the right side of the window, expand the POST method, and you will see the same error:

Resolver error at paths./foo.post.responses.201.content.application/json.schema.properties.p1.properties.p1.properties.p1.$ref
Could not resolve reference: Could not resolve pointer: /components/schemas/B2 does not exist in document
Jump to line 18

Reproduce the resolver error with test.yaml and its cross-references to a.yaml and b.yaml at the documented URL, starting from the SwaggerClient constructor and the reported nested $ref. Trace why B2 is not found through the chained references; done means all three files load without a resolver error and the referenced schema resolves.