diff --git a/dns-packet-tests.ts b/dns-packet-tests.ts
new file mode 100644
index 0000000..2c15a64
--- /dev/null
+++ b/dns-packet-tests.ts
@@ -0,0 +1,277 @@
+import {
+    Answer,
+    decode,
+    DecodedPacket,
+    encode,
+    encodingLength,
+    Packet,
+    Question,
+    RECURSION_DESIRED,
+    streamDecode,
+    streamEncode,
+} from "dns-packet";
+
+const answer: Answer = {
+    type: "A",
+    name: "localhost",
+    ttl: 3600,
+    data: "127.0.0.1",
+    class: "ANY",
+    flush: true,
+};
+
+const question: Question = {
+    type: "A",
+    name: "localhost",
+    class: "IN",
+};
+
+const inPacket: Packet = {
+    additionals: [answer],
+    authorities: [answer],
+    answers: [answer],
+    flags: 0,
+    id: 0,
+    questions: [question],
+    type: "query",
+};
+
+const inputBuf = Buffer.alloc(0);
+const length: number = encodingLength(inPacket);
+const out: Buffer = encode(inPacket, inputBuf, length - length);
+const outPacket: DecodedPacket = decode(out, 0);
+const flag_qr: boolean = outPacket.flag_qr;
+const flag_aa: boolean = outPacket.flag_aa;
+const flag_tc: boolean = outPacket.flag_tc;
+const flag_rd: boolean = outPacket.flag_rd;
+const flag_ra: boolean = outPacket.flag_ra;
+const flag_z: boolean = outPacket.flag_z;
+const flag_ad: boolean = outPacket.flag_ad;
+const flag_cd: boolean = outPacket.flag_cd;
+
+encode(outPacket);
+
+const records: Answer[] = [
+    {
+        type: "A",
+        name: "localhost",
+        data: "127.0.0.1",
+    },
+    {
+        type: "AAAA",
+        name: "localhost",
+        data: "::1",
+    },
+    {
+        type: "CNAME",
+        name: "localhost",
+        data: "example.com",
+    },
+    {
+        type: "DNSKEY",
+        name: "localhost",
+        data: {
+            algorithm: 1,
+            flags: 257,
+            key: Buffer.from("test"),
+        },
+    },
+    {
+        type: "DS",
+        name: "localhost",
+        data: {
+            keyTag: 12345,
+            algorithm: 8,
+            digestType: 1,
+            digest: Buffer.from("test"),
+        },
+    },
+    {
+        type: "NAPTR",
+        name: "localhost",
+        data: {
+            order: 100,
+            preference: 10,
+            flags: "s",
+            services: "SIP+D2U",
+            regexp: "!^.*$!sip:customer-service@example.com!",
+            replacement: "_sip._udp.example.com",
+        },
+    },
+    {
+        type: "NS",
+        name: "localhost",
+        data: "ns1.localhost",
+    },
+    {
+        type: "NSEC",
+        name: "localhost",
+        data: {
+            nextDomain: "a.domain",
+            rrtypes: ["A", "TXT", "RRSIG"],
+        },
+    },
+    {
+        type: "NSEC3",
+        name: "localhost",
+        data: {
+            algorithm: 1,
+            flags: 0,
+            iterations: 2,
+            salt: Buffer.from("test"),
+            nextDomain: Buffer.from("test"), // Hashed per RFC5155
+            rrtypes: ["A", "TXT", "RRSIG"],
+        },
+    },
+    {
+        type: "MX",
+        name: "localhost",
+        data: {
+            preference: 10,
+            exchange: "mx.localhost",
+        },
+    },
+    {
+        type: "TXT",
+        name: "localhost",
+        data: "test",
+    },
+    {
+        type: "TXT",
+        name: "localhost",
+        data: Buffer.from("test"),
+    },
+    {
+        type: "TXT",
+        name: "localhost",
+        data: ["foo", "bar"],
+    },
+    {
+        type: "SRV",
+        name: "_imap._tcp.localhost",
+        data: {
+            priority: 10,
+            weight: 60,
+            port: 5060,
+            target: "imap.example.com",
+        },
+    },
+    {
+        type: "SOA",
+        name: "localhost",
+        data: {
+            mname: "localhost",
+            rname: "hostmaster.localhost",
+            serial: 2021122101,
+        },
+    },
+    {
+        type: "CAA",
+        name: "localhost",
+        data: {
+            issuerCritical: false,
+            tag: "issue",
+            value: "ca.example.com",
+        },
+    },
+    {
+        type: "TXT",
+        name: "version.bind",
+        class: "CH",
+        data: "1.2.3",
+    },
+    {
+        type: "OPT",
+        name: ".",
+        udpPayloadSize: 65535,
+        extendedRcode: 255,
+        ednsVersion: 255,
+        flags: 65535,
+        flag_do: true,
+        options: [
+            {
+                code: 8,
+                type: "CLIENT_SUBNET",
+                sourcePrefixLength: 0,
+                scopePrefixLength: 0,
+                ip: "127.0.0.1",
+            },
+            {
+                code: 8,
+                ip: "127.0.0.1",
+            },
+            {
+                code: 11,
+                type: "TCP_KEEPALIVE",
+            },
+            {
+                code: 11,
+                timeout: 2468,
+            },
+            {
+                code: 12,
+                length: 13,
+            },
+            {
+                code: 14,
+                tags: [],
+            },
+            {
+                code: 14,
+                tags: [256],
+            },
+        ],
+    },
+    {
+        type: "RP",
+        name: "localhost",
+        data: {
+            mbox: "admin.example.com",
+            txt: "txt.example.com",
+        },
+    },
+    {
+        type: "RRSIG",
+        name: "localhost",
+        data: {
+            typeCovered: "A",
+            algorithm: 8,
+            labels: 1,
+            originalTTL: 3600,
+            expiration: Date.now(),
+            inception: Date.now(),
+            keyTag: 12345,
+            signersName: "a.name",
+            signature: Buffer.from("test"),
+        },
+    },
+    {
+        type: "SSHFP",
+        name: "localhost",
+        data: {
+            algorithm: 1,
+            hash: 1,
+            fingerprint: "A108C9F834354D5B37AF988141C9294822F5BC00",
+        },
+    },
+];
+encode({ answers: records });
+
+// https://github.com/mafintosh/dns-packet/blob/5aebb85c3221292e994d01b68cadf067e78efabf/examples/tcp.js
+function getRandomInt(min: number, max: number): number {
+    return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+let buf = streamEncode({
+    type: "query",
+    id: getRandomInt(1, 65534),
+    flags: RECURSION_DESIRED,
+    questions: [
+        {
+            type: "A",
+            name: "google.com",
+        },
+    ],
+});
+streamDecode(buf);
+buf = buf.slice(2 + streamDecode.bytes);
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..d642e13
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,668 @@
+/// <reference types="node" />
+
+/**
+ * The currently defined set of DNS record types.
+ */
+export type RecordType =
+    | "A"
+    | "AAAA"
+    | "AFSDB"
+    | "APL"
+    | "AXFR"
+    | "CAA"
+    | "CDNSKEY"
+    | "CDS"
+    | "CERT"
+    | "CNAME"
+    | "DNAME"
+    | "DHCID"
+    | "DLV"
+    | "DNSKEY"
+    | "DS"
+    | "HINFO"
+    | "HIP"
+    | "HTTPS"
+    | "IXFR"
+    | "IPSECKEY"
+    | "KEY"
+    | "KX"
+    | "LOC"
+    | "MX"
+    | "NAPTR"
+    | "NS"
+    | "NSEC"
+    | "NSEC3"
+    | "NSEC3PARAM"
+    | "NULL"
+    | "OPT"
+    | "PTR"
+    | "RRSIG"
+    | "RP"
+    | "SIG"
+    | "SOA"
+    | "SRV"
+    | "SSHFP"
+    | "SVCB"
+    | "TA"
+    | "TKEY"
+    | "TLSA"
+    | "TSIG"
+    | "TXT"
+    | "URI";
+
+export type RecordClass = "IN" | "CS" | "CH" | "HS" | "ANY";
+
+export interface Question {
+    type: RecordType;
+    name: string;
+    class?: RecordClass | undefined;
+    qu_bit?: boolean | undefined;
+}
+
+// Data interfaces for various record types
+export interface CaaData {
+    issuerCritical?: boolean | undefined;
+    flags?: number | undefined;
+    tag: "issue" | "issuewild" | "iodef";
+    value: string;
+}
+
+export interface DnskeyData {
+    flags: number;
+    algorithm: number;
+    key: Buffer;
+}
+
+export interface DsData {
+    keyTag: number;
+    algorithm: number;
+    digestType: number;
+    digest: Buffer;
+}
+
+export interface HInfoData {
+    cpu: string;
+    os: string;
+}
+
+export interface MxData {
+    preference?: number | undefined;
+    exchange: string;
+}
+
+export interface NaptrData {
+    order: number;
+    preference: number;
+    flags: string;
+    services: string;
+    regexp: string;
+    replacement: string;
+}
+
+export interface NsecData {
+    nextDomain: string;
+    rrtypes: string[];
+}
+
+export interface Nsec3Data {
+    algorithm: number;
+    flags: number;
+    iterations: number;
+    salt: Buffer;
+    nextDomain: Buffer;
+    rrtypes: string[];
+}
+
+export interface RpData {
+    mbox: string;
+    txt: string;
+}
+
+export interface RrsigData {
+    typeCovered: string;
+    algorithm: number;
+    labels: number;
+    originalTTL: number;
+    expiration: number;
+    inception: number;
+    keyTag: number;
+    signersName: string;
+    signature: Buffer;
+}
+
+export interface SrvData {
+    port: number;
+    target: string;
+    priority?: number | undefined;
+    weight?: number | undefined;
+}
+
+export interface SoaData {
+    mname: string;
+    rname: string;
+    serial?: number | undefined;
+    refresh?: number | undefined;
+    retry?: number | undefined;
+    expire?: number | undefined;
+    minimum?: number | undefined;
+}
+
+export interface SshfpData {
+    algorithm: number;
+    hash: number;
+    fingerprint: string;
+}
+
+export interface TlsaData {
+    usage: number;
+    selector: number;
+    matchingType: number;
+    certificate: Buffer;
+}
+
+export type TxtData = string | Buffer | Array<string | Buffer>;
+
+// SVCB/HTTPS Parameter types
+export interface SvcParamMandatory {
+    key: "mandatory" | 0;
+    value: Array<string | number>;
+}
+
+export interface SvcParamAlpn {
+    key: "alpn" | 1;
+    value: string | string[];
+}
+
+export interface SvcParamNoDefaultAlpn {
+    key: "no-default-alpn" | 2;
+    value?: number | undefined;
+}
+
+export interface SvcParamPort {
+    key: "port" | 3;
+    value: number;
+}
+
+export interface SvcParamIpv4Hint {
+    key: "ipv4hint" | 4;
+    value: string | string[];
+}
+
+export interface SvcParamEchConfig {
+    key: "echconfig" | 5;
+    value: string;
+    needBase64Decode?: boolean | undefined;
+}
+
+export interface SvcParamIpv6Hint {
+    key: "ipv6hint" | 6;
+    value: string | string[];
+}
+
+export interface SvcParamDohPath {
+    key: "dohpath" | 7;
+    value: string;
+}
+
+export interface SvcParamOdoh {
+    key: "odoh" | 32769;
+    value: string;
+    needBase64Decode?: boolean | undefined;
+}
+
+export interface SvcParamUnknown {
+    key: string | number;
+    value?: unknown | undefined;
+    data?: Buffer | undefined;
+}
+
+export type SvcParam =
+    | SvcParamMandatory
+    | SvcParamAlpn
+    | SvcParamNoDefaultAlpn
+    | SvcParamPort
+    | SvcParamIpv4Hint
+    | SvcParamEchConfig
+    | SvcParamIpv6Hint
+    | SvcParamDohPath
+    | SvcParamOdoh
+    | SvcParamUnknown;
+
+export interface HttpsData {
+    priority: number;
+    name: string;
+    values?: Record<string, unknown> | undefined;
+}
+
+export interface SvcbData {
+    priority: number;
+    name: string;
+    values?: Record<string, unknown> | undefined;
+}
+
+// Generic answer types
+export interface GenericAnswer<T> {
+    type: T;
+    name: string;
+}
+
+export interface BaseAnswer<T, D> extends GenericAnswer<T> {
+    ttl?: number | undefined;
+    class?: RecordClass | undefined;
+    flush?: boolean | undefined;
+    data: D;
+}
+
+// Answer type groupings
+export type StringRecordType = "A" | "AAAA" | "CNAME" | "DNAME" | "NS" | "PTR";
+
+export type OtherRecordType =
+    | "AFSDB"
+    | "APL"
+    | "AXFR"
+    | "CDNSKEY"
+    | "CDS"
+    | "CERT"
+    | "DHCID"
+    | "DLV"
+    | "HIP"
+    | "IPSECKEY"
+    | "IXFR"
+    | "KEY"
+    | "KX"
+    | "LOC"
+    | "NSEC3PARAM"
+    | "NULL"
+    | "SIG"
+    | "TA"
+    | "TKEY"
+    | "TSIG"
+    | "URI";
+
+// Specific answer types
+export type StringAnswer = BaseAnswer<StringRecordType, string>;
+export type BufferAnswer = BaseAnswer<OtherRecordType, Buffer>;
+export type CaaAnswer = BaseAnswer<"CAA", CaaData>;
+export type DnskeyAnswer = BaseAnswer<"DNSKEY", DnskeyData>;
+export type DSAnswer = BaseAnswer<"DS", DsData>;
+export type HInfoAnswer = BaseAnswer<"HINFO", HInfoData>;
+export type MxAnswer = BaseAnswer<"MX", MxData>;
+export type NaptrAnswer = BaseAnswer<"NAPTR", NaptrData>;
+export type Nsec3Answer = BaseAnswer<"NSEC3", Nsec3Data>;
+export type NsecAnswer = BaseAnswer<"NSEC", NsecData>;
+export type RpAnswer = BaseAnswer<"RP", RpData>;
+export type RrsigAnswer = BaseAnswer<"RRSIG", RrsigData>;
+export type SoaAnswer = BaseAnswer<"SOA", SoaData>;
+export type SrvAnswer = BaseAnswer<"SRV", SrvData>;
+export type SshfpAnswer = BaseAnswer<"SSHFP", SshfpData>;
+export type TlsaAnswer = BaseAnswer<"TLSA", TlsaData>;
+export type TxtAnswer = BaseAnswer<"TXT", TxtData>;
+export type SvcbAnswer = BaseAnswer<"SVCB", SvcbData>;
+export type HttpsAnswer = BaseAnswer<"HTTPS", HttpsData>;
+
+// OPT record
+interface OptCodes {
+    OPTION_0: 0;
+    LLQ: 1;
+    UL: 2;
+    NSID: 3;
+    OPTION_4: 4;
+    DAU: 5;
+    DHU: 6;
+    N3U: 7;
+    CLIENT_SUBNET: 8;
+    EXPIRE: 9;
+    COOKIE: 10;
+    TCP_KEEPALIVE: 11;
+    PADDING: 12;
+    CHAIN: 13;
+    KEY_TAG: 14;
+    DEVICEID: 26946;
+    OPTION_65535: 65535;
+}
+
+type OptCodeType = keyof OptCodes;
+type OptCode<K extends OptCodeType> = OptCodes[K];
+
+interface GenericOpt<T extends OptCodeType> {
+    code: OptCode<T>;
+    type?: T | undefined;
+    data?: Buffer | undefined;
+}
+
+interface ClientSubnetOpt extends GenericOpt<"CLIENT_SUBNET"> {
+    family?: number | undefined;
+    sourcePrefixLength?: number | undefined;
+    scopePrefixLength?: number | undefined;
+    ip: string | undefined;
+}
+
+interface KeepAliveOpt extends GenericOpt<"TCP_KEEPALIVE"> {
+    timeout?: number | undefined;
+}
+
+interface PaddingOpt extends GenericOpt<"PADDING"> {
+    length?: number | undefined;
+}
+
+interface TagOpt extends GenericOpt<"KEY_TAG"> {
+    tags: number[];
+}
+
+export type PacketOpt = ClientSubnetOpt | KeepAliveOpt | PaddingOpt | TagOpt;
+
+export interface OptAnswer extends GenericAnswer<"OPT"> {
+    udpPayloadSize: number;
+    extendedRcode: number;
+    ednsVersion: number;
+    flags: number;
+
+    /**
+     * Whether or not the DNS DO bit is set
+     */
+    flag_do: boolean;
+
+    options: PacketOpt[];
+}
+
+// Complete answer union type
+export type Answer =
+    | StringAnswer
+    | BufferAnswer
+    | CaaAnswer
+    | DnskeyAnswer
+    | DSAnswer
+    | HInfoAnswer
+    | HttpsAnswer
+    | MxAnswer
+    | NaptrAnswer
+    | Nsec3Answer
+    | NsecAnswer
+    | OptAnswer
+    | RpAnswer
+    | RrsigAnswer
+    | SoaAnswer
+    | SrvAnswer
+    | SshfpAnswer
+    | SvcbAnswer
+    | TlsaAnswer
+    | TxtAnswer;
+
+export interface Packet {
+    /**
+     * Whether the packet is a query or a response. This field may be
+     * omitted if it is clear from the context of usage what type of packet
+     * it is.
+     */
+    type?: "query" | "response" | undefined;
+
+    id?: number | undefined;
+
+    /**
+     * A bit-mask combination of zero or more of:
+     * {@link AUTHORITATIVE_ANSWER},
+     * {@link TRUNCATED_RESPONSE},
+     * {@link RECURSION_DESIRED},
+     * {@link RECURSION_AVAILABLE},
+     * {@link AUTHENTIC_DATA},
+     * {@link CHECKING_DISABLED},
+     * {@link DNSSEC_OK}.
+     */
+    flags?: number | undefined;
+
+    opcode?: string | undefined;
+    rcode?: string | undefined;
+
+    questions?: Question[] | undefined;
+    answers?: Answer[] | undefined;
+    additionals?: Answer[] | undefined;
+    authorities?: Answer[] | undefined;
+}
+
+/**
+ * Decoded packet with individual flag bits extracted.
+ */
+export interface DecodedPacket extends Packet {
+    flag_qr: boolean;
+    flag_aa: boolean;
+    flag_tc: boolean;
+    flag_rd: boolean;
+    flag_ra: boolean;
+    flag_z: boolean;
+    flag_ad: boolean;
+    flag_cd: boolean;
+}
+
+// Constants
+export const AUTHORITATIVE_ANSWER: number;
+export const TRUNCATED_RESPONSE: number;
+export const RECURSION_DESIRED: number;
+export const RECURSION_AVAILABLE: number;
+export const AUTHENTIC_DATA: number;
+export const CHECKING_DISABLED: number;
+export const DNSSEC_OK: number;
+export const NXDOMAIN: number;
+
+// Main functions
+export function encode(packet: Packet, buf?: Buffer, offset?: number): Buffer;
+
+export namespace encode {
+    let bytes: number;
+}
+
+export function decode(buf: Buffer, offset?: number): DecodedPacket;
+
+export namespace decode {
+    let bytes: number;
+}
+
+export function encodingLength(packet: Packet): number;
+
+export function streamEncode(packet: Packet): Buffer;
+
+export namespace streamEncode {
+    let bytes: number;
+}
+
+export function streamDecode(buf: Buffer): DecodedPacket | null;
+
+export namespace streamDecode {
+    let bytes: number;
+}
+
+// Utility/Helper exports
+export const name: {
+    encode(
+        str: string,
+        buf?: Buffer,
+        offset?: number,
+        options?: { mail?: boolean }
+    ): Buffer;
+    decode(buf: Buffer, offset?: number, options?: { mail?: boolean }): string;
+    encodingLength(name: string): number;
+};
+
+export const question: {
+    encode(q: Question, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): Question;
+    encodingLength(q: Question): number;
+};
+
+export const answer: {
+    encode(a: Answer, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): Answer;
+    encodingLength(a: Answer): number;
+};
+
+export const svcparam: {
+    encode(param: SvcParam, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): SvcParam;
+    encodingLength(param: SvcParam): number;
+    keyToNumber(keyName: string): number;
+    numberToKeyName(number: number): string;
+};
+
+export const svcb: {
+    encode(data: SvcbData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): SvcbData;
+    encodingLength(data: SvcbData): number;
+};
+
+export const httpssvc: {
+    encode(data: HttpsData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): HttpsData;
+    encodingLength(data: HttpsData): number;
+};
+
+export const a: {
+    encode(host: string, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): string;
+    encodingLength(): number;
+};
+
+export const aaaa: {
+    encode(host: string, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): string;
+    encodingLength(): number;
+};
+
+export const cname: {
+    encode(data: string, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): string;
+    encodingLength(data: string): number;
+};
+
+export const dname: {
+    encode(data: string, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): string;
+    encodingLength(data: string): number;
+};
+
+export const ptr: {
+    encode(data: string, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): string;
+    encodingLength(data: string): number;
+};
+
+export const ns: {
+    encode(data: string, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): string;
+    encodingLength(data: string): number;
+};
+
+export const mx: {
+    encode(data: MxData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): MxData;
+    encodingLength(data: MxData): number;
+};
+
+export const srv: {
+    encode(data: SrvData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): SrvData;
+    encodingLength(data: SrvData): number;
+};
+
+export const caa: {
+    encode(data: CaaData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): CaaData;
+    encodingLength(data: CaaData): number;
+    ISSUER_CRITICAL: number;
+};
+
+export const txt: {
+    encode(data: TxtData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): Buffer[];
+    encodingLength(data: TxtData): number;
+};
+
+export const null_: {
+    encode(data: Buffer | string, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): Buffer;
+    encodingLength(data?: Buffer | string): number;
+};
+
+export const hinfo: {
+    encode(data: HInfoData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): HInfoData;
+    encodingLength(data: HInfoData): number;
+};
+
+export const soa: {
+    encode(data: SoaData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): SoaData;
+    encodingLength(data: SoaData): number;
+};
+
+export const naptr: {
+    encode(data: NaptrData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): NaptrData;
+    encodingLength(data: NaptrData): number;
+};
+
+export const dnskey: {
+    encode(key: DnskeyData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): DnskeyData;
+    encodingLength(key: DnskeyData): number;
+    PROTOCOL_DNSSEC: number;
+    ZONE_KEY: number;
+    SECURE_ENTRYPOINT: number;
+};
+
+export const rrsig: {
+    encode(sig: RrsigData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): RrsigData;
+    encodingLength(sig: RrsigData): number;
+};
+
+export const rp: {
+    encode(data: RpData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): RpData;
+    encodingLength(data: RpData): number;
+};
+
+export const nsec: {
+    encode(record: NsecData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): NsecData;
+    encodingLength(record: NsecData): number;
+};
+
+export const nsec3: {
+    encode(record: Nsec3Data, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): Nsec3Data;
+    encodingLength(record: Nsec3Data): number;
+};
+
+export const ds: {
+    encode(digest: DsData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): DsData;
+    encodingLength(digest: DsData): number;
+};
+
+export const sshfp: {
+    encode(record: SshfpData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): SshfpData;
+    encodingLength(record: SshfpData): number;
+    getFingerprintLengthForHashType(hashType: number): number | undefined;
+};
+
+export const tlsa: {
+    encode(cert: TlsaData, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): TlsaData;
+    encodingLength(cert: TlsaData): number;
+};
+
+export const opt: {
+    encode(options: PacketOpt[], buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): PacketOpt[];
+    encodingLength(options: PacketOpt[]): number;
+};
+
+export const unknown: {
+    encode(data: Buffer, buf?: Buffer, offset?: number): Buffer;
+    decode(buf: Buffer, offset?: number): Buffer;
+    encodingLength(data: Buffer): number;
+};
+
+export function record(type: RecordType): any;
+
+export {};
diff --git a/package.json b/package.json
index 9b79b96..d402b40 100644
--- a/package.json
+++ b/package.json
@@ -19,14 +19,17 @@
   "dependencies": {
     "@leichtgewicht/ip-codec": "^2.0.1"
   },
+  "types": "index.d.ts",
   "devDependencies": {
+    "@types/node": "*",
     "eslint": "^5.14.1",
     "eslint-config-standard": "^12.0.0",
     "eslint-plugin-import": "^2.16.0",
     "eslint-plugin-node": "^8.0.1",
     "eslint-plugin-promise": "^4.0.1",
     "eslint-plugin-standard": "^4.0.0",
-    "tape": "^4.10.1"
+    "tape": "^4.10.1",
+    "typescript": "^6.0.2"
   },
   "keywords": [
     "dns",
@@ -38,6 +41,7 @@
   ],
   "files": [
     "index.js",
+    "index.d.ts",
     "types.js",
     "rcodes.js",
     "opcodes.js",
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..71c0d55
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "module": "node16",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "types": ["node"],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "ignoreDeprecations": "6.0",
+        "baseUrl": ".",
+        "paths": {
+            "dns-packet": ["./index.d.ts"]
+        }
+    },
+    "files": [
+        "index.d.ts",
+        "dns-packet-tests.ts"
+    ]
+}