in vscode-extension/src/logging.ts [153:162]
private logLevelNameToValue(logLevelName: string): LogLevel {
switch (logLevelName.toLowerCase()) {
case "diagnostic": return LogLevel.Diagnostic;
case "verbose": return LogLevel.Verbose;
case "normal": return LogLevel.Normal;
case "warning": return LogLevel.Warning;
case "error": return LogLevel.Error;
default: return LogLevel.Normal;
}
}