file:export

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Payload",
  "description": "`commandId` is dropped, the same Batch-0 convention `edit::set_cell::Payload` already uses.",
  "type": "object",
  "properties": {
    "sheet": {
      "description": "The sheet named on the wire, validated to exist for every `format`.",
      "type": "string"
    },
    "format": {
      "$ref": "#/$defs/Format"
    }
  },
  "required": [
    "sheet",
    "format"
  ],
  "$defs": {
    "Format": {
      "description": "Every variant PARSES.",
      "type": "string",
      "enum": [
        "json",
        "csv",
        "xlsx"
      ]
    }
  }
}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Output",
  "description": "`file:export`'s typed result.",
  "type": "object",
  "properties": {
    "format": {
      "$ref": "#/$defs/Format"
    },
    "content": {
      "type": "string"
    }
  },
  "required": [
    "format",
    "content"
  ],
  "$defs": {
    "Format": {
      "description": "Every variant PARSES.",
      "type": "string",
      "enum": [
        "json",
        "csv",
        "xlsx"
      ]
    }
  }
}