Function encodeBoundedError

packages/computer/src/runtime/bridge.ts:499–519

(error: unknown, maxPayloadBytes: number)

}

function encodeBoundedError(error: unknown, maxPayloadBytes: number) {
  const value = error as { code?: unknown; path?: unknown };
  const message = error instanceof Error ? error.message : String(error);
  const detailed = JSON.stringify({
    error: {
      message,
      ...(typeof value?.code === "string" ? { code: value.code } : {}),
      ...(typeof value?.path === "string" ? { path: value.path } : {}),
    },
  });
  const encoder = new TextEncoder();
  if (encoder.encode(detailed).byteLength <= maxPayloadBytes) return detailed;

  let budget = Math.max(0, maxPayloadBytes - 40);
  while (budget >= 0) {
    const bounded = JSON.stringify({ error: { message: truncateUtf8(message, budget) } });
    if (encoder.encode(bounded).byteLength <= maxPayloadBytes) return bounded;
    budget -= 1;
  }
  return JSON.stringify({ error: { message: "Capability call failed" } });
}

function truncateUtf8(value: string, maxBytes: number) {
  const bytes = new TextEncoder().encode(value);