Add a configuration for ZodPipeline

[steckhelena]

The parser for the ZodPipeline could be configurable like the one for ZodEffects. Sometimes the pipeline is only an internal transformation we may not want in the generated schema.

Currently, it works as follows:

const dateModel = z.object({
  year: z.number().min(2021).max(2023),
  month: z.number().min(1).max(12),
  day: z.number().min(1).max(31),
})

const stringInputDate = z
  .string()
  .regex(/^[0-9]{4}-[0-9]{2}-[0-9]{2}$/)
  .transform((date) => {
    const [year, month, day] = date.split('-')

    return {
      year: Number(year),
      month: Number(month),
      day: Number(day),
    }
  }).pipe(dateModel)

const schema = zodToJsonSchema(stringInputDate)

which will generate something like:

{
  "allOf": [
    { "type": "string", "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}$" },
    {
      "type": "object",
      "properties": {
        "year": { "type": "number", "minimum": 2021, "maximum": 2023 },
        "month": { "type": "number", "minimum": 1, "maximum": 12 },
        "day": { "type": "number", "minimum": 1, "maximum": 31 }
      },
      "required": ["year", "month", "day"],
      "additionalProperties": false
    }
  ],
  "$schema": "http://json-schema.org/draft-07/schema#"
}

I propose the addition of a pipelineStrategy: 'input' | 'all' which would then make the output be:

{
  "type": "string",
  "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}$",
  "$schema": "http://json-schema.org/draft-07/schema#"
}

if the input strategy was selected.

[StefanTerdell]

Added in 3.20.5