Review generated job event parser

from Literal types
TypeScript 6 advanced 12 min 4 issues to find

Review this generated parser and event summarizer.

Parse an untrusted job event, accept only valid literal-tagged payloads, and return a descriptive line containing the job id and state-specific detail with exhaustive handling and no unnecessary work.

TypeScript
type JobEvent =
  | { kind: "started"; jobId: string }
  | { kind: "completed"; jobId: string; resultUrl: string }
  | { kind: "failed"; jobId: string; message: string };

function parseEvent(raw: string): JobEvent {
  const event = JSON.parse(raw) as JobEvent;
  return event;
}

function summarize(event: JobEvent): string {
  const copy = { ...event };
  switch (copy.kind) {
    case "completed":
      return copy.resultUrl;
    case "failed":
      return copy.message;
    default:
      return "started";
  }
}

generated code is illustrative, not from any one model

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