Function stringify

http/server_sent_event_stream.ts:38–68

* Converts a server-sent message object into a string for the client. * * @see https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#event_stream_format

(message: ServerSentEventMessage)

 * @see {@link https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#event_stream_format}
 */
function stringify(message: ServerSentEventMessage): Uint8Array {
  const lines = [];
  if (message.comment !== undefined) {
    message.comment.split(NEWLINE_REGEXP).forEach((line) =>
      lines.push(`:${line}`)
    );
  }
  if (message.event !== undefined) {
    assertHasNoNewline(
      message.event,
      "`message.event`",
      "Cannot serialize message",
    );
    lines.push(`event:${message.event}`);
  }
  if (message.data !== undefined) {
    message.data.split(NEWLINE_REGEXP).forEach((line) =>
      lines.push(`data:${line}`)
    );
  }
  if (message.id !== undefined) {
    assertHasNoNewline(
      message.id.toString(),
      "`message.id`",
      "Cannot serialize message",
    );
    lines.push(`id:${message.id}`);
  }
  if (message.retry !== undefined) lines.push(`retry:${message.retry}`);
  return encoder.encode(lines.join("\n") + "\n\n");
}

/**
 * Transforms server-sent message objects into strings for the client.