[Bug]: Formatter runs on log call, even if log is not correct level

[DanKaplanSES]

The problem

For visibility, this is a duplicate of winstonjs/winston#2441 I'm not sure which repo is the correct one to create this in.

What version of Logform presents the issue?

v2.6.0

What version of Node are you using?

v20.10.0

If this is a TypeScript issue, what version of TypeScript are you using?

v5.3.3

If this worked in a previous version of Logform, which was it?

No response

Minimum Working Example

const winston = require('winston');

const logger = winston.createLogger({
  level: 'info',
  format: winston.format.combine(
    winston.format.json(),
    winston.format((input) => {
      let lagger = 0;
      for (let i = 0; i < 1000000000; i++) {
        lagger += 1;
      }
      return input;
    })()
  ),
  defaultMeta: { service: 'user-service' },
  transports: [
    new winston.transports.Console({
      format: winston.format.simple(),
    })
  ],
});

setInterval(() => {
  // I still see formatter for this log in profiler taking up some seconds
  logger.debug('Hello world!');
}, 1000);

Additional information

This bug causes performance issues.

🔎 Search Terms

bug, performance, winston, winstonjs, formatter