An 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.
The 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).
A string to prepend to all log output. If not specified, the default is "[LaunchDarkly] ".
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Configuration for [[basicLogger]].