Add blossom support

packages/util/src/Kinds.ts

@@ -1,12 +1,26 @@
-import {
-  isRegularKind,
-  isEphemeralKind,
-  isReplaceableKind as isPlainReplaceableKind,
-  isParameterizedReplaceableKind,
-} from "nostr-tools/kinds"
 import {between} from "@welshman/lib"
 
-export {isRegularKind, isEphemeralKind, isPlainReplaceableKind, isParameterizedReplaceableKind}
+/** Events are **regular**, which means they're all expected to be stored by relays. */
+export function isRegularKind(kind: number): boolean {
+  return (
+    (1000 <= kind && kind < 10000) || [1, 2, 4, 5, 6, 7, 8, 16, 40, 41, 42, 43, 44].includes(kind)
+  )
+}
+
+/** Events are **replaceable**, which means that, for each combination of `pubkey` and `kind`, only the latest event is expected to (SHOULD) be stored by relays, older versions are expected to be discarded. */
+export function isPlainReplaceableKind(kind: number): boolean {
+  return [0, 3].includes(kind) || (10000 <= kind && kind < 20000)
+}
+
+/** Events are **ephemeral**, which means they are not expected to be stored by relays. */
+export function isEphemeralKind(kind: number): boolean {
+  return 20000 <= kind && kind < 30000
+}
+
+/** Events are **parameterized replaceable**, which means that, for each combination of `pubkey`, `kind` and the `d` tag, only the latest event is expected to be stored by relays, older versions are expected to be discarded. */
+export function isParameterizedReplaceableKind(kind: number): boolean {
+  return 30000 <= kind && kind < 40000
+}
 
 export const isReplaceableKind = (kind: number) =>
   isPlainReplaceableKind(kind) || isParameterizedReplaceableKind(kind)