support ephemeral command replies with missing pieces

library/core/reacord-discord-js.ts

@@ -72,6 +72,34 @@ export class ReacordDiscordJs extends Reacord {
       initialContent,
     )
   }
+
+  override ephemeralReply(
+    interaction: Discord.CommandInteraction,
+    initialContent?: React.ReactNode,
+  ): ReacordInstance {
+    return this.createInstance(
+      new CommandReplyRenderer({
+        type: "command",
+        id: interaction.id,
+        channelId: interaction.channelId,
+        reply: async (options) => {
+          await interaction.reply({
+            ...getDiscordMessageOptions(options),
+            ephemeral: true,
+          })
+          return createEphemeralReacordMessage()
+        },
+        followUp: async (options) => {
+          await interaction.followUp({
+            ...getDiscordMessageOptions(options),
+            ephemeral: true,
+          })
+          return createEphemeralReacordMessage()
+        },
+      }),
+      initialContent,
+    )
+  }
 }
 
 function createReacordComponentInteraction(
@@ -176,3 +204,20 @@ function createReacordMessage(message: Discord.Message): Message {
     },
   }
 }
+
+function createEphemeralReacordMessage(): Message {
+  return {
+    edit: () => {
+      console.warn("Ephemeral messages can't be edited")
+      return Promise.resolve()
+    },
+    disableComponents: () => {
+      console.warn("Ephemeral messages can't be edited")
+      return Promise.resolve()
+    },
+    delete: () => {
+      console.warn("Ephemeral messages can't be deleted")
+      return Promise.resolve()
+    },
+  }
+}

library/core/reacord-tester.ts

@@ -52,6 +52,10 @@ export class ReacordTester extends Reacord {
     )
   }
 
+  override ephemeralReply(): ReacordInstance {
+    return this.reply()
+  }
+
   async assertMessages(expected: ReturnType<this["sampleMessages"]>) {
     await nextTickPromise()
     expect(this.sampleMessages()).toEqual(expected)

library/core/reacord.ts

@@ -28,6 +28,7 @@ export abstract class Reacord {
 
   abstract send(...args: unknown[]): ReacordInstance
   abstract reply(...args: unknown[]): ReacordInstance
+  abstract ephemeralReply(...args: unknown[]): ReacordInstance
 
   protected handleComponentInteraction(interaction: ComponentInteraction) {
     for (const renderer of this.renderers) {