Function transform

src/connection_string.ts:655–665

({ name, options, values: [value] })

  auth: {
    target: 'credentials',
    transform({ name, options, values: [value] }): MongoCredentials {
      if (!isRecord(value, ['username', 'password'] as const)) {
        throw new MongoParseError(
          `${name} must be an object with 'username' and 'password' properties`
        );
      }
      return MongoCredentials.merge(options.credentials, {
        username: value.username,
        password: value.password
      });
    }
  },
  authMechanism: {
    target: 'credentials',