add more details on missing $ref

[AlexHolly]

Example Current infos:
https://apitools.dev/swagger-parser/online/

openapi: 3.0.2 info: description: >- This is a sample server Petstore server. version: 1.0.0 title: Swagger Petstore termsOfService: 'http://swagger.io/terms/' contact: email: apiteam@swagger.io license: name: Apache 2.0 url: 'http://www.apache.org/licenses/LICENSE-2.0.html' paths: /pet: post: tags: - pet parameters: - $ref: '#/components/parameters/ThisIsMissing' components: parameters: petId: name: petId in: path required: true schema: type: integer format: int64 

PR will give this data

$ref value of: #/paths/~1pet/post/parameters/0 is missing target: #/components/parameters/ThisIsMissing found: #/components/parameters 

[JamesMessinger]

Hi @AlexHolly. Thank you for the PR. It looks like that code should probably go inside the MissingPointerError class instead (with additional data passed as parameters to the constructor).

[AlexHolly]

Done.

[P0lip]

Besides the TS definition, a minor test update would be cool.
We presumably already have some tests for MissingPointerError, thus adding an additional assertion should be sufficient, no need to write a new case.

[jonluca]

This PR looks good - apologies for the long delay here @AlexHolly

If you rebase this onto latest I'll merge it in.

[AlexHolly]

@jonluca I am unable to test it with https://github.com/APIDevTools/swagger-parser looks like it expects .js files. Is there a command to build them?