Prism does not start mock locally

[SamJust]

When I try to start mock server locally, I get an error. No matter what src for OpenAPI spec source I use.

Context

It does not start mock server

Current Behavior

The command crashes
Throws an error

[3:34:15 PM] › [CLI] ✖  fatal     Error downloading https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml 
The "emitter" argument must be an instance of EventEmitter or EventTarget. Received an instance of AbortSignal
prism mock <document>

Start a mock server with the given document file

Positionals:
  document  Path to a document file. Can be both a file or a fetchable resource
            on the web.                                      [string] [required]

Options:
      --version       Show version number                              [boolean]
      --help          Show help                                        [boolean]
  -p, --port          Port that Prism will run on.
                                             [number] [required] [default: 4010]
  -h, --host          Host that Prism will listen to.
                                      [string] [required] [default: "127.0.0.1"]
      --cors          Enables CORS headers.            [boolean] [default: true]
  -m, --multiprocess  Forks the http server from the CLI for faster log
                      processing.                     [boolean] [default: false]
      --errors        Specifies whether request/response violations marked as
                      errors will produce an error response
                                           [boolean] [required] [default: false]
  -v, --verboseLevel  Turns on verbose logging.
        [required] [choices: "trace", "debug", "info", "warn", "error", "fatal",
                                                     "silent"] [default: "info"]
  -d, --dynamic       Dynamically generate examples.  [boolean] [default: false]

{
  stack: 'ResolverError: Error downloading https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml \n' +
    'The "emitter" argument must be an instance of EventEmitter or EventTarget. Received an instance of AbortSignal\n' +
    '    at download (/Users/viktorbezrdonyi/.nvm/versions/node/v18.15.0/lib/node_modules/@stoplight/prism-cli/node_modules/@stoplight/json-schema-ref-parser/lib/resolvers/http.js:175:11)\n' +
    '    at processTicksAndRejections (node:internal/process/task_queues:95:5)',
  code: 'ERESOLVER',
  message: 'Error downloading https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml \n' +
    'The "emitter" argument must be an instance of EventEmitter or EventTarget. Received an instance of AbortSignal',
  source: 'https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml',
  path: null,
  toJSON: [Function: toJSON],
  ioErrorCode: 'ERR_INVALID_ARG_TYPE',
  name: 'ResolverError',
  toString: [Function: toString]
}

Expected Behavior

The mock server starts

Steps to Reproduce

1. $ npm i -g @stoplight/prism-cli
2. $ prism mock https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml

Environment

• Version used: 5.0.1
• Environment name and version: Node v18.15.0
• Operating System and version: MacOS: 13.2.1 (22D68)
• Link to your environment/workspace/project: It's a single CLI call.

[EdVinyard]

As you said, Prism is broken running under Node.js 18.15.x.

% sw_vers -productVersion # Mac OS version
13.4

% nvm install 18.15.0
Downloading and installing node v18.15.0...
Downloading https://nodejs.org/dist/v18.15.0/node-v18.15.0-darwin-x64.tar.xz...
###################################################################################################################################################################################### 100.0%
Computing checksum with sha256sum
Checksums matched!
Now using node v18.15.0 (npm v9.5.0)

% npm install --global @stoplight/prism-cli
...

% prism --version
5.0.1

% prism mock https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml
[9:38:32 AM] › [CLI] …  awaiting  Starting Prism…
[9:38:32 AM] › [CLI] ✖  fatal     Error downloading https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml
The "emitter" argument must be an instance of EventEmitter or EventTarget. Received an instance of AbortSignal
...

However, the problem is fixed in 18.16.x.

% nvm use 18
Now using node v18.16.1 (npm v9.5.1)

% npm install --global @stoplight/prism-cli
npm WARN deprecated [email protected]: Please switch to @apidevtools/json-schema-ref-parser
...

% prism --version
5.0.1

% prism mock https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml
[9:34:14 AM] › [CLI] …  awaiting  Starting Prism…
[9:34:15 AM] › [CLI] ℹ  info      GET        http://127.0.0.1:4010/pets
[9:34:15 AM] › [CLI] ℹ  info      POST       http://127.0.0.1:4010/pets
[9:34:15 AM] › [CLI] ℹ  info      GET        http://127.0.0.1:4010/pets/-2232339446628286500
[9:34:15 AM] › [CLI] ℹ  info      DELETE     http://127.0.0.1:4010/pets/-8359716962358653000
[9:34:15 AM] › [CLI] ▶  start     Prism is listening on http://127.0.0.1:4010
[9:34:27 AM] › [HTTP SERVER] get /pets ℹ  info      Request received
[9:34:27 AM] ›     [NEGOTIATOR] ℹ  info      Request contains an accept header: */*
[9:34:27 AM] ›     [VALIDATOR] ✔  success   The request passed the validation rules. Looking for the best response
[9:34:27 AM] ›     [NEGOTIATOR] ✔  success   Found a compatible content for */*
[9:34:27 AM] ›     [NEGOTIATOR] ✔  success   Responding with the requested status code 200
[9:34:27 AM] ›     [NEGOTIATOR] ℹ  info      > Responding with "200"

It looks like the cause is an issue in Node.js's version of undici, as discussed here and fixed in 18.16.x. Although there is a workaround possible for 18.15 I don't think we'll incorporate that into Prism itself.

We recommend an upgrade to 18.16.x, and I'll update the documentation to include this caveat for Node.js 18.x in this PR.