How to reference callback functions with x-faker?

[ttomasini]

Related to #2056
How do I reference a callback function for fakerjs functions like helpers.maybe()?

I already tried the following but it throws an exception:

    x-faker:
      helpers.maybe: ['helpers.replaceSymbolWithNumber("foobar: ####")']

Exception:

{
    "detail": "",
    "status": 500,
    "title": "TypeError: e is not a function\n    at maybe (/usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/@faker-js/faker/dist/cjs/helpers.js:1:6335)\n    at Object.<anonymous> (/usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/json-schema-faker/dist/main.cjs:1321:21)\n    at Object.value (/usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/json-schema-faker/dist/main.cjs:1379:49)\n    at /usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/json-schema-faker/dist/main.cjs:2218:70\n    at Object.typecast (/usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/json-schema-faker/dist/main.cjs:1023:15)\n    at traverse (/usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/json-schema-faker/dist/main.cjs:2218:34)\n    at /usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/json-schema-faker/dist/main.cjs:2282:48\n    at Array.forEach (<anonymous>)\n    at traverse (/usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/json-schema-faker/dist/main.cjs:2276:23)\n    at Object.objectType [as object] (/usr/local/lib/node_modules/@stoplight/prism-cli/node_modules/json-schema-faker/dist/main.cjs:1920:18) in /properties/postaladdress",
    "type": "https://stoplight.io/prism/errors#UNKNOWN"
}