OptionaldestinationAn optional function to use to print each log line.
If this is specified, basicLogger calls it to write each line of output. The
argument is a fully formatted log line, not including a linefeed. The function
is only called for log levels that are enabled.
If not specified, the default in browsers is to use console.log, console.info,
console.warn, or console.error according to the level; the default in
Node.js and Electron is to always use console.log.
Setting this property to anything other than a function will cause SDK initialization to fail.
OptionallevelThe lowest level of log message to enable.
See LDLogLevel for a list of possible levels. Setting a level here causes
all lower-importance levels to be disabled: for instance, if you specify
'warn', then 'debug' and 'info' are disabled.
If not specified, the default is 'info' (meaning that 'debug' is disabled).
OptionalprefixA string to prepend to all log output. If not specified, the default is "[LaunchDarkly] ".
Configuration for basicLogger.