TypeScript Diagnostic

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.typescriptlang.org/schemas/diagnostic",
  "title": "TypeScript Diagnostic",
  "description": "A compiler diagnostic message (error, warning, or suggestion) produced by the TypeScript Compiler API",
  "type": "object",
  "required": ["messageText", "category", "code"],
  "properties": {
    "file": {
      "type": "object",
      "description": "The source file in which the diagnostic occurred",
      "properties": {
        "fileName": {
          "type": "string",
          "description": "Path to the source file"
        }
      }
    },
    "start": {
      "type": "integer",
      "description": "Character offset in the source file where the diagnostic starts"
    },
    "length": {
      "type": "integer",
      "description": "Length of the diagnostic span in characters"
    },
    "messageText": {
      "oneOf": [
        {"type": "string"},
        {
          "type": "object",
          "description": "Chained diagnostic message",
          "properties": {
            "messageText": {"type": "string"},
            "category": {"type": "integer"},
            "code": {"type": "integer"},
            "next": {"type": "array"}
          }
        }
      ],
      "description": "The diagnostic message text"
    },
    "category": {
      "type": "integer",
      "enum": [0, 1, 2, 3],
      "description": "0=Warning, 1=Error, 2=Suggestion, 3=Message"
    },
    "code": {
      "type": "integer",
      "description": "Numeric TypeScript error code (e.g., 2345)"
    },
    "source": {
      "type": "string",
      "description": "Optional source identifier for the diagnostic"
    }
  }
}