TypeScript error when trying to configure optional sinks

[rojakcoder]

I'm trying to create conditional configurations for LogTape based on environment variables but keep bumping up against the TypeScript error about types being incompatible.

This is the closest that I've got.

  let sinks:
    | Record<'console' | 'syslog', Sink>
    | Record<'console' | 'syslog' | 'file', Sink> = {
    console: getConsoleSink(),
    syslog: getSyslogSink(),
  };
  let loggers = [
    {
      category: ['logtape', 'meta'],
      sinks: ['syslog'],
    },
    {
      category: appName,
      lowestLevel: 'debug',
      sinks: ['console'],
    },
  ]
  if (logFile) {
    sinks = {
      ...sinks,
      file: getFileSink(`${logDir}/${logFile}`),
    };
    loggers = [
      loggers[0],
      {
        category: appName,
        lowestLevel: 'debug',
        sinks: ['console', 'file'],
      }
    ]
  }
  await configure({
    sinks,
    loggers,
 // ^^^^^^^ Complains about "Type 'string' is not assignable to type '"console" | "syslog"'."
  });

Is there a way around this? Or is the only option to call await configure in an if-else statement? i.e.

if (logFile) {
  await configure(...); // Invoke with file sink.
} else {
  await configure(...); // Invoke without file sink.
}

[dahlia]

How about this?

await configure({
  sinks: {
	console: getConsoleSink(),
	syslog: getSyslogSink(),
    file: logFile
      ? getFileSink(`${logDir}/${logFile}`)
      : (_: LogRecord) => {},
  },
  loggers: [
    {
      category: ['logtape', 'meta'],
      sinks: ['syslog'],
    },
    {
      category: appName,
      lowestLevel: 'debug',
      sinks: ['console', 'file'],
    },
  ],
});

[rojakcoder]

That works! The gist is to create a placeholder function for the key that is added later.