1 files changed, 47 insertions, 2 deletions

diff --git a/cli/tsc/dts/lib.deno.unstable.d.ts b/cli/tsc/dts/lib.deno.unstable.d.ts
index ed7e682f1..62426ca35 100644
--- a/cli/tsc/dts/lib.deno.unstable.d.ts
+++ b/cli/tsc/dts/lib.deno.unstable.d.ts
@@ -163,7 +163,7 @@ declare namespace Deno {
    */
   type ToNativeResultType<T extends NativeResultType = NativeResultType> =
     T extends NativeStructType ? BufferSource
-    : ToNativeResultTypeMap[Exclude<T, NativeStructType>];
+      : ToNativeResultTypeMap[Exclude<T, NativeStructType>];
 
   /** **UNSTABLE**: New API, yet to be vetted.
    *
@@ -225,7 +225,7 @@ declare namespace Deno {
    */
   type FromNativeResultType<T extends NativeResultType = NativeResultType> =
     T extends NativeStructType ? Uint8Array
-    : FromNativeResultTypeMap[Exclude<T, NativeStructType>];
+      : FromNativeResultTypeMap[Exclude<T, NativeStructType>];
 
   /** **UNSTABLE**: New API, yet to be vetted.
    *
@@ -852,11 +852,51 @@ declare namespace Deno {
 
   /** **UNSTABLE**: New API, yet to be vetted.
    *
+   * Represents membership of a IPv4 multicast group.
+   *
+   * @category Network
+   */
+  interface MulticastV4Membership {
+    /** Leaves the multicast group. */
+    leave: () => Promise<void>;
+    /** Sets the multicast loopback option. If enabled, multicast packets will be looped back to the local socket. */
+    setLoopback: (loopback: boolean) => Promise<void>;
+    /** Sets the time-to-live of outgoing multicast packets for this socket. */
+    setTTL: (ttl: number) => Promise<void>;
+  }
+
+  /** **UNSTABLE**: New API, yet to be vetted.
+   *
+   * Represents membership of a IPv6 multicast group.
+   *
+   * @category Network
+   */
+  interface MulticastV6Membership {
+    /** Leaves the multicast group. */
+    leave: () => Promise<void>;
+    /** Sets the multicast loopback option. If enabled, multicast packets will be looped back to the local socket. */
+    setLoopback: (loopback: boolean) => Promise<void>;
+  }
+
+  /** **UNSTABLE**: New API, yet to be vetted.
+   *
    * A generic transport listener for message-oriented protocols.
    *
    * @category Network
    */
   export interface DatagramConn extends AsyncIterable<[Uint8Array, Addr]> {
+    /** Joins an IPv4 multicast group. */
+    joinMulticastV4(
+      address: string,
+      networkInterface: string,
+    ): Promise<MulticastV4Membership>;
+
+    /** Joins an IPv6 multicast group. */
+    joinMulticastV6(
+      address: string,
+      networkInterface: number,
+    ): Promise<MulticastV6Membership>;
+
     /** Waits for and resolves to the next message to the instance.
      *
      * Messages are received in the format of a tuple containing the data array
@@ -918,6 +958,11 @@ declare namespace Deno {
      *
      * @default {false} */
     reuseAddress?: boolean;
+
+    /** When `true`, sent multicast packets will be looped back to the local socket.
+     *
+     * @default {false} */
+    loopback?: boolean;
   }
 
   /** **UNSTABLE**: New API, yet to be vetted.