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diff --git a/ext/net/lib.deno_net.unstable.d.ts b/ext/net/lib.deno_net.unstable.d.ts
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+++ b/ext/net/lib.deno_net.unstable.d.ts
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+// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+
+/// <reference no-default-lib="true" />
+/// <reference lib="esnext" />
+
+declare namespace Deno {
+  /** The type of the resource record.
+   * Only the listed types are supported currently. */
+  export type RecordType =
+    | "A"
+    | "AAAA"
+    | "ANAME"
+    | "CNAME"
+    | "MX"
+    | "PTR"
+    | "SRV"
+    | "TXT";
+
+  export interface ResolveDnsOptions {
+    /** The name server to be used for lookups.
+  * If not specified, defaults to the system configuration e.g. `/etc/resolv.conf` on Unix. */
+    nameServer?: {
+      /** The IP address of the name server */
+      ipAddr: string;
+      /** The port number the query will be sent to.
+    * If not specified, defaults to 53. */
+      port?: number;
+    };
+  }
+
+  /** If `resolveDns` is called with "MX" record type specified, it will return an array of this interface. */
+  export interface MXRecord {
+    preference: number;
+    exchange: string;
+  }
+
+  /** If `resolveDns` is called with "SRV" record type specified, it will return an array of this interface. */
+  export interface SRVRecord {
+    priority: number;
+    weight: number;
+    port: number;
+    target: string;
+  }
+
+  export function resolveDns(
+    query: string,
+    recordType: "A" | "AAAA" | "ANAME" | "CNAME" | "PTR",
+    options?: ResolveDnsOptions,
+  ): Promise<string[]>;
+
+  export function resolveDns(
+    query: string,
+    recordType: "MX",
+    options?: ResolveDnsOptions,
+  ): Promise<MXRecord[]>;
+
+  export function resolveDns(
+    query: string,
+    recordType: "SRV",
+    options?: ResolveDnsOptions,
+  ): Promise<SRVRecord[]>;
+
+  export function resolveDns(
+    query: string,
+    recordType: "TXT",
+    options?: ResolveDnsOptions,
+  ): Promise<string[][]>;
+
+  /** ** UNSTABLE**: new API, yet to be vetted.
+*
+* Performs DNS resolution against the given query, returning resolved records.
+* Fails in the cases such as:
+* - the query is in invalid format
+* - the options have an invalid parameter, e.g. `nameServer.port` is beyond the range of 16-bit unsigned integer
+* - timed out
+*
+* ```ts
+* const a = await Deno.resolveDns("example.com", "A");
+*
+* const aaaa = await Deno.resolveDns("example.com", "AAAA", {
+*   nameServer: { ipAddr: "8.8.8.8", port: 1234 },
+* });
+* ```
+*
+* Requires `allow-net` permission.
+  */
+  export function resolveDns(
+    query: string,
+    recordType: RecordType,
+    options?: ResolveDnsOptions,
+  ): Promise<string[] | MXRecord[] | SRVRecord[] | string[][]>;
+
+  /** **UNSTABLE**: new API, yet to be vetted.
+*
+* A generic transport listener for message-oriented protocols. */
+  export interface DatagramConn extends AsyncIterable<[Uint8Array, Addr]> {
+    /** **UNSTABLE**: new API, yet to be vetted.
+  *
+  * Waits for and resolves to the next message to the `UDPConn`. */
+    receive(p?: Uint8Array): Promise<[Uint8Array, Addr]>;
+    /** UNSTABLE: new API, yet to be vetted.
+  *
+  * Sends a message to the target. */
+    send(p: Uint8Array, addr: Addr): Promise<number>;
+    /** UNSTABLE: new API, yet to be vetted.
+  *
+  * Close closes the socket. Any pending message promises will be rejected
+  * with errors. */
+    close(): void;
+    /** Return the address of the `UDPConn`. */
+    readonly addr: Addr;
+    [Symbol.asyncIterator](): AsyncIterableIterator<[Uint8Array, Addr]>;
+  }
+
+  export interface UnixListenOptions {
+    /** A Path to the Unix Socket. */
+    path: string;
+  }
+
+  /** **UNSTABLE**: new API, yet to be vetted.
+*
+* Listen announces on the local transport address.
+*
+* ```ts
+* const listener = Deno.listen({ path: "/foo/bar.sock", transport: "unix" })
+* ```
+*
+* Requires `allow-read` and `allow-write` permission. */
+  export function listen(
+    options: UnixListenOptions & { transport: "unix" },
+  ): Listener;
+
+  /** **UNSTABLE**: new API, yet to be vetted
+*
+* Listen announces on the local transport address.
+*
+* ```ts
+* const listener1 = Deno.listenDatagram({
+*   port: 80,
+*   transport: "udp"
+* });
+* const listener2 = Deno.listenDatagram({
+*   hostname: "golang.org",
+*   port: 80,
+*   transport: "udp"
+* });
+* ```
+*
+* Requires `allow-net` permission. */
+  export function listenDatagram(
+    options: ListenOptions & { transport: "udp" },
+  ): DatagramConn;
+
+  /** **UNSTABLE**: new API, yet to be vetted
+*
+* Listen announces on the local transport address.
+*
+* ```ts
+* const listener = Deno.listenDatagram({
+*   path: "/foo/bar.sock",
+*   transport: "unixpacket"
+* });
+* ```
+*
+* Requires `allow-read` and `allow-write` permission. */
+  export function listenDatagram(
+    options: UnixListenOptions & { transport: "unixpacket" },
+  ): DatagramConn;
+
+  export interface UnixConnectOptions {
+    transport: "unix";
+    path: string;
+  }
+
+  /** **UNSTABLE**:  The unix socket transport is unstable as a new API yet to
+* be vetted.  The TCP transport is considered stable.
+*
+* Connects to the hostname (default is "127.0.0.1") and port on the named
+* transport (default is "tcp"), and resolves to the connection (`Conn`).
+*
+* ```ts
+* const conn1 = await Deno.connect({ port: 80 });
+* const conn2 = await Deno.connect({ hostname: "192.0.2.1", port: 80 });
+* const conn3 = await Deno.connect({ hostname: "[2001:db8::1]", port: 80 });
+* const conn4 = await Deno.connect({ hostname: "golang.org", port: 80, transport: "tcp" });
+* const conn5 = await Deno.connect({ path: "/foo/bar.sock", transport: "unix" });
+* ```
+*
+* Requires `allow-net` permission for "tcp" and `allow-read` for "unix". */
+  export function connect(
+    options: ConnectOptions | UnixConnectOptions,
+  ): Promise<Conn>;
+
+  export interface ConnectTlsClientCertOptions {
+    /** PEM formatted client certificate chain. */
+    certChain: string;
+    /** PEM formatted (RSA or PKCS8) private key of client certificate. */
+    privateKey: string;
+  }
+
+  /** **UNSTABLE** New API, yet to be vetted.
+   *
+   * Create a TLS connection with an attached client certificate.
+   *
+   * ```ts
+   * const conn = await Deno.connectTls({
+   *   hostname: "deno.land",
+   *   port: 443,
+   *   certChain: "---- BEGIN CERTIFICATE ----\n ...",
+   *   privateKey: "---- BEGIN PRIVATE KEY ----\n ...",
+   * });
+   * ```
+   *
+   * Requires `allow-net` permission.
+   */
+  export function connectTls(
+    options: ConnectTlsOptions & ConnectTlsClientCertOptions,
+  ): Promise<Conn>;
+
+  export interface StartTlsOptions {
+    /** A literal IP address or host name that can be resolved to an IP address.
+  * If not specified, defaults to `127.0.0.1`. */
+    hostname?: string;
+    /** Server certificate file. */
+    certFile?: string;
+  }
+
+  /** **UNSTABLE**: new API, yet to be vetted.
+*
+* Start TLS handshake from an existing connection using
+* an optional cert file, hostname (default is "127.0.0.1").  The
+* cert file is optional and if not included Mozilla's root certificates will
+* be used (see also https://github.com/ctz/webpki-roots for specifics)
+* Using this function requires that the other end of the connection is
+* prepared for TLS handshake.
+*
+* ```ts
+* const conn = await Deno.connect({ port: 80, hostname: "127.0.0.1" });
+* const tlsConn = await Deno.startTls(conn, { certFile: "./certs/my_custom_root_CA.pem", hostname: "localhost" });
+* ```
+*
+* Requires `allow-net` permission.
+  */
+  export function startTls(
+    conn: Conn,
+    options?: StartTlsOptions,
+  ): Promise<Conn>;
+
+  export interface ListenTlsOptions {
+    /** **UNSTABLE**: new API, yet to be vetted.
+  *
+  * Application-Layer Protocol Negotiation (ALPN) protocols to announce to
+  * the client. If not specified, no ALPN extension will be included in the
+  * TLS handshake.
+  */
+    alpnProtocols?: string[];
+  }
+}