Here is a list of all documented variables with links to the class documentation for each member:

- f -

• fallback_url_ : td::td_api::internalLinkTypeInstantView
• feature_ : td::td_api::premiumFeaturePromotionAnimation, td::td_api::premiumSourceFeature, td::td_api::premiumSourceStoryFeature, td::td_api::viewPremiumFeature
• features_ : td::td_api::premiumFeatures
• feedback_link_ : td::td_api::webPageInstantView
• few_value_ : td::td_api::languagePackStringValuePluralized
• field_name_ : td::td_api::inputPassportElementErrorSourceDataField, td::td_api::passportElementErrorSourceDataField
• file_ : td::td_api::animatedChatPhoto, td::td_api::datedFile, td::td_api::preliminaryUploadFile, td::td_api::thumbnail, td::td_api::updateFile
• file_count_ : td::td_api::storageStatisticsFast
• file_download_ : td::td_api::updateFileAddedToDownloads
• file_hash_ : td::td_api::inputPassportElementErrorSourceFile, td::td_api::inputPassportElementErrorSourceFrontSide, td::td_api::inputPassportElementErrorSourceReverseSide, td::td_api::inputPassportElementErrorSourceSelfie, td::td_api::inputPassportElementErrorSourceTranslationFile
• file_hashes_ : td::td_api::inputPassportElementErrorSourceFiles, td::td_api::inputPassportElementErrorSourceTranslationFiles
• file_id_ : td::td_api::addFileToDownloads, td::td_api::cancelDownloadFile, td::td_api::cancelPreliminaryUploadFile, td::td_api::deleteFile, td::td_api::downloadFile, td::td_api::fileDownload, td::td_api::getAttachedStickerSets, td::td_api::getFile, td::td_api::getFileDownloadedPrefixSize, td::td_api::getSuggestedFileName, td::td_api::readFilePart, td::td_api::removeFileFromDownloads, td::td_api::reportChatPhoto, td::td_api::toggleDownloadIsPaused, td::td_api::updateFileDownload, td::td_api::updateFileRemovedFromDownloads
• file_index_ : td::td_api::passportElementErrorSourceFile, td::td_api::passportElementErrorSourceTranslationFile
• file_name_ : td::td_api::animation, td::td_api::audio, td::td_api::cleanFileName, td::td_api::document, td::td_api::getFileMimeType, td::td_api::video
• file_type_ : td::td_api::getRemoteFile, td::td_api::networkStatisticsEntryFile, td::td_api::preliminaryUploadFile, td::td_api::storageStatisticsByFileType
• file_types_ : td::td_api::optimizeStorage
• files_ : td::td_api::encryptedPassportElement, td::td_api::foundFileDownloads, td::td_api::inputPersonalDocument, td::td_api::personalDocument
• files_directory_ : td::td_api::setTdlibParameters
• files_size_ : td::td_api::storageStatisticsFast
• fill_ : td::td_api::backgroundTypeFill, td::td_api::backgroundTypePattern
• filter_ : td::td_api::getChatMessageCalendar, td::td_api::getChatMessageCount, td::td_api::getChatMessagePosition, td::td_api::getChatSparseMessagePositions, td::td_api::getSupergroupMembers, td::td_api::searchChatMembers, td::td_api::searchChatMessages, td::td_api::searchMessages, td::td_api::searchSecretMessages
• filters_ : td::td_api::getChatEventLog
• final_state_ : td::td_api::messageDice
• firebase_authentication_settings_ : td::td_api::phoneNumberAuthenticationSettings
• first_name_ : td::td_api::contact, td::td_api::personalDetails, td::td_api::registerUser, td::td_api::setName, td::td_api::user
• fitzpatrick_type_ : td::td_api::animatedEmoji
• folder_ : td::td_api::createChatFolder, td::td_api::editChatFolder, td::td_api::getChatFolderChatCount, td::td_api::getChatFolderDefaultIconName, td::td_api::recommendedChatFolder
• footer_ : td::td_api::pageBlockFooter
• for_album_ : td::td_api::getMessageEmbeddingCode, td::td_api::getMessageLink, td::td_api::messageLinkInfo
• for_dark_theme_ : td::td_api::getBackgrounds, td::td_api::setBackground, td::td_api::updateSelectedBackground
• for_import_ : td::td_api::createNewSupergroupChat
• force_ : td::td_api::createBasicGroupChat, td::td_api::createPrivateChat, td::td_api::createSupergroupChat, td::td_api::setGameScore, td::td_api::setInlineGameScore
• force_full_ : td::td_api::getWebPageInstantView
• force_quiz_ : td::td_api::keyboardButtonTypeRequestPoll
• force_read_ : td::td_api::viewMessages
• force_regular_ : td::td_api::keyboardButtonTypeRequestPoll
• format_ : td::td_api::sticker, td::td_api::thumbnail
• formatted_phone_number_ : td::td_api::phoneNumberInfo
• forum_changes_ : td::td_api::chatEventLogFilters
• forward_count_ : td::td_api::chatStatisticsMessageInteractionInfo, td::td_api::messageInteractionInfo, td::td_api::storyInteractionInfo
• forward_info_ : td::td_api::message
• forward_limit_ : td::td_api::addChatMember
• forward_text_ : td::td_api::inlineKeyboardButtonTypeLoginUrl
• from_background_ : td::td_api::messageSendOptions
• from_cache_ : td::td_api::updateDeleteMessages
• from_chat_id_ : td::td_api::forwardMessages, td::td_api::inputMessageForwarded, td::td_api::messageForwardInfo
• from_event_id_ : td::td_api::getChatEventLog
• from_message_id_ : td::td_api::getChatHistory, td::td_api::getChatMessageCalendar, td::td_api::getChatSparseMessagePositions, td::td_api::getMessageThreadHistory, td::td_api::messageForwardInfo, td::td_api::searchChatMessages
• from_story_id_ : td::td_api::getChatArchivedStories, td::td_api::getChatPinnedStories
• from_user_id_ : td::td_api::messageChatSetMessageAutoDeleteTime
• front_side_ : td::td_api::encryptedPassportElement, td::td_api::identityDocument, td::td_api::inputIdentityDocument
• full_ : td::td_api::getMemoryStatistics
• full_type_ : td::td_api::sticker
• function : td::Client::Request