ActivitySchema: "\n activity {\n ... on TextActivity {\n id\n userId\n type\n replyCount\n text (asHtml: $asHtml)\n siteUrl\n isLocked\n isSubscribed\n likeCount\n isLiked\n isPinned\n createdAt\n }\n ... on ListActivity {\n id\n userId\n type\n replyCount\n status\n progress\n isLocked\n isSubscribed\n likeCount\n isLiked\n isPinned\n siteUrl\n createdAt\n media {\n id\n title {\n romaji\n english\n }\n }\n }\n ... on MessageActivity {\n id\n recipientId\n messengerId\n type\n replyCount\n message (asHtml: $asHtml)\n isLocked\n isSubscribed\n likeCount\n isLiked\n isPrivate\n siteUrl\n createdAt\n }\n }\n" = ...

ActivitySchema is a constant representing the GraphQL schema for an activity query. It includes the TextActivity, ListActivity, and MessageActivity each having their own properties.