in adapter/src/debugSession.ts [998:1007]
private static formatPII(format:string, excludePII: boolean, args: {[key: string]: string}): string {
return format.replace(DebugSession._formatPIIRegexp, function(match, paramName) {
if (excludePII && paramName.length > 0 && paramName[0] !== '_') {
return match;
}
return args[paramName] && args.hasOwnProperty(paramName) ?
args[paramName] :
match;
})
}