Upd

Author: tyranron

book/Cargo.toml

@@ -9,6 +9,7 @@ publish = false
 anyhow = "1.0"
 dataloader = "0.18"
 derive_more = { version = "2.0", features = ["display", "from", "try_into"] }
+jiff = { version = "0.2", features = ["std"], default-features = false }
 juniper = { path = "../juniper", features = ["anyhow", "jiff", "schema-language"] }
 juniper_subscriptions = { path = "../juniper_subscriptions" }
 serde_json = "1.0"

book/src/lib.rs

@@ -3,6 +3,7 @@
 use anyhow as _;
 use dataloader as _;
 use derive_more as _;
+use jiff as _;
 use juniper as _;
 use juniper_subscriptions as _;
 use serde_json as _;