Interface MongoDBLogWritable

src/mongo_logger.ts:316–334

 * A custom destination for structured logging messages.
 */
export interface MongoDBLogWritable {
  /**
   * This function will be called for every enabled log message.
   *
   * It can be sync or async:
   * - If it is synchronous it will block the driver from proceeding until this method returns.
   * - If it is asynchronous the driver will not await the returned promise. It will attach fulfillment handling (`.then`).
   *   If the promise rejects the logger will write an error message to stderr and stop functioning.
   *   If the promise resolves the driver proceeds to the next log message (or waits for new ones to occur).
   *
   * Tips:
   * - We recommend writing an async `write` function that _never_ rejects.
   *   Instead handle logging errors as necessary to your use case and make the write function a noop, until it can be recovered.
   * - The Log messages are structured but **subject to change** since the intended purpose is informational.
   *   Program against this defensively and err on the side of stringifying whatever is passed in to write in some form or another.
   *
   */
  write(log: Log): PromiseLike<unknown> | unknown;
}

function compareSeverity(s0: SeverityLevel, s1: SeverityLevel): 1 | 0 | -1 {
  const s0Num = SEVERITY_LEVEL_MAP.getNumericSeverityLevel(s0);