TypeError: json_1.extractPointerFromRef is not a function

Describe the bug Rule ‘oas3-unused-components-schema’ causes an error.

To Reproduce

1. Given this OpenAPI document:

openapi: 3.0.1
info:
  title: Test
  version: v1
  description: "Description"
  license:
    name: None
    url: https://www.google.com/legal
servers:
  - description: Prism mock server
    url: http://localhost:4010
tags:
  - name: sessions
paths:
  /sessions:
    description: Desc
    post:
      operationId: createSession
      description: Creates a new session
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                device:
                  description: Device information
                  type: string
              required:
                - device
      responses:
        '201':
          description: Session has been created successfully
          headers:
            x-rds-context:
              description: Session context data that is shared by all future requests
              schema:
                type: string
      tags:
      - sessions
components:
  schemas:
    ErrorItem:
      $ref: https://pastebin.com/raw/8YRYeFUY

1. Run this CLI command: spectral lint openapi.yaml
2. See error message:

OpenAPI 3.x detected
Encountered error when running rule 'oas3-unused-components-schema' on node at path '$,components,schemas':
TypeError: json_1.extractPointerFromRef is not a function
 
undefined
2:6   warning  info-contact  Info object should contain `contact` object.
43:15    error  oas3-schema   `ErrorItem` property type should be object
 
✖ 2 problems (1 error, 1 warning, 0 infos, 0 hints)

Expected behavior No type errors in the output and something better than undefined below it would be nice.

Environment:

• Library version: 5.0.0

[nulltoken]

@lehphyro Below the output when running the provided openapi spec against the development branch:

$ yarn cli lint repro/openapi.yaml
yarn run v1.19.2
$ node -r ts-node/register -r tsconfig-paths/register src/cli/index.ts lint repro/openapi.yaml
[...snipped development warnings...]
OpenAPI 3.x detected
[...snipped development warnings...]

h:/spectral/repro/openapi.yaml
  2:6   warning  info-contact                   Info object should contain `contact` object.
 43:15  warning  oas3-unused-components-schema  Potentially unused components schema has been detected.

✖ 2 problems (0 errors, 2 warnings, 0 infos, 0 hints)

Looks like the undefined thingie has been fixed as well (Probably by #900)

[lehphyro]

No, it’s not, thanks.