Forbid using default log levels when `useOnlyCustomLevels: true`

[chernodub]

Currently, pino's TS declaration allows using default log levels when useOnlyCustomLevels is true. This following code will result in a runtime error:

import { pino } from 'pino';

const logger = pino({
  customLevels: { customInfo: 10 },
  useOnlyCustomLevels: true,
});

logger.info('123'); // TS should warn here ?
logger.customInfo('123'); // should work fine

Expected behavior:

import { pino } from 'pino';

const logger = pino({
  customLevels: { customInfo: 10 },
  useOnlyCustomLevels: true,
});

logger.info('123'); // TS errors here
logger.customInfo('123'); // works fine

[mcollina]

Thanks for reporting! Would you like to send a Pull Request to address this issue? Remember to add unit tests. We use tsd for the types.

[chernodub]

Thanks for reporting! Would you like to send a Pull Request to address this issue? Remember to add unit tests. We use tsd for the types.

Yep, already submitted the PR #1999 :)

[github-actions]

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