feat: Add consts for near, yocto, and tgas

near-sdk/src/types/gas.rs

@@ -20,6 +20,11 @@ use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 #[repr(transparent)]
 pub struct Gas(pub u64);
 
+impl Gas {
+    /// One Tera gas, which is 10^12 gas units.
+    pub const ONE_TERA: Gas = Gas(1_000_000_000_000);
+}
+
 impl Serialize for Gas {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where

near-sdk/src/types/mod.rs

@@ -21,3 +21,9 @@ pub type Timestamp = u64;
 
 /// Raw type for 32 bytes of the hash.
 pub type CryptoHash = [u8; 32];
+
+/// Balance of one Yocto NEAR, which is the smallest denomination. This value is 10^-24 of one NEAR.
+pub const ONE_YOCTO: u128 = 1;
+
+/// Balance of one NEAR, which is 10^24 Yocto NEAR.
+pub const ONE_NEAR: u128 = 1_000_000_000_000_000_000_000_000;