const defaultTimestampFormat … const FieldKeyMsg … const FieldKeyLevel … const FieldKeyTime … const FieldKeyLogrusError … const FieldKeyFunc … const FieldKeyFile … type Formatter … // This is to not silently overwrite `time`, `msg`, `func` and `level` fields when // dumping it. If this code wasn't there doing: // // logrus.WithField("level", 1).Info("hello") // // Would just silently drop the user provided level. Instead with this code // it'll logged as: // // {"level": "info", "fields.level": 1, "msg": "hello", "time": "..."} // // It's not exported because it's still using Data in an opinionated way. It's to // avoid code duplication between the two default formatters. func prefixFieldClashes(data Fields, fieldMap FieldMap, reportCaller bool) { … }