diff --git a/.gitignore b/.gitignore
index 44d646d..3c3629e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1 @@
 node_modules
-dist/
diff --git a/dist/binary.d.ts b/dist/binary.d.ts
new file mode 100644
index 0000000..835bd62
--- /dev/null
+++ b/dist/binary.d.ts
@@ -0,0 +1,20 @@
+/**
+ * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.
+ *
+ * @param {Object} packet - socket.io event packet
+ * @return {Object} with deconstructed packet and list of buffers
+ * @public
+ */
+export declare function deconstructPacket(packet: any): {
+    packet: any;
+    buffers: any[];
+};
+/**
+ * Reconstructs a binary packet from its placeholder packet and buffers
+ *
+ * @param {Object} packet - event packet with placeholders
+ * @param {Array} buffers - binary buffers to put in placeholder positions
+ * @return {Object} reconstructed packet
+ * @public
+ */
+export declare function reconstructPacket(packet: any, buffers: any): any;
diff --git a/dist/binary.js b/dist/binary.js
new file mode 100644
index 0000000..cbee976
--- /dev/null
+++ b/dist/binary.js
@@ -0,0 +1,83 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.reconstructPacket = exports.deconstructPacket = void 0;
+const is_binary_1 = __importDefault(require("./is-binary"));
+/**
+ * Replaces every Buffer | ArrayBuffer | Blob | File in packet with a numbered placeholder.
+ *
+ * @param {Object} packet - socket.io event packet
+ * @return {Object} with deconstructed packet and list of buffers
+ * @public
+ */
+function deconstructPacket(packet) {
+    const buffers = [];
+    const packetData = packet.data;
+    const pack = packet;
+    pack.data = _deconstructPacket(packetData, buffers);
+    pack.attachments = buffers.length; // number of binary 'attachments'
+    return { packet: pack, buffers: buffers };
+}
+exports.deconstructPacket = deconstructPacket;
+function _deconstructPacket(data, buffers) {
+    if (!data)
+        return data;
+    if (is_binary_1.default(data)) {
+        const placeholder = { _placeholder: true, num: buffers.length };
+        buffers.push(data);
+        return placeholder;
+    }
+    else if (Array.isArray(data)) {
+        const newData = new Array(data.length);
+        for (let i = 0; i < data.length; i++) {
+            newData[i] = _deconstructPacket(data[i], buffers);
+        }
+        return newData;
+    }
+    else if (typeof data === "object" && !(data instanceof Date)) {
+        const newData = {};
+        for (const key in data) {
+            if (data.hasOwnProperty(key)) {
+                newData[key] = _deconstructPacket(data[key], buffers);
+            }
+        }
+        return newData;
+    }
+    return data;
+}
+/**
+ * Reconstructs a binary packet from its placeholder packet and buffers
+ *
+ * @param {Object} packet - event packet with placeholders
+ * @param {Array} buffers - binary buffers to put in placeholder positions
+ * @return {Object} reconstructed packet
+ * @public
+ */
+function reconstructPacket(packet, buffers) {
+    packet.data = _reconstructPacket(packet.data, buffers);
+    packet.attachments = undefined; // no longer useful
+    return packet;
+}
+exports.reconstructPacket = reconstructPacket;
+function _reconstructPacket(data, buffers) {
+    if (!data)
+        return data;
+    if (data && data._placeholder) {
+        return buffers[data.num]; // appropriate buffer (should be natural order anyway)
+    }
+    else if (Array.isArray(data)) {
+        for (let i = 0; i < data.length; i++) {
+            data[i] = _reconstructPacket(data[i], buffers);
+        }
+    }
+    else if (typeof data === "object") {
+        for (const key in data) {
+            if (data.hasOwnProperty(key)) {
+                data[key] = _reconstructPacket(data[key], buffers);
+            }
+        }
+    }
+    return data;
+}
diff --git a/dist/index.d.ts b/dist/index.d.ts
new file mode 100644
index 0000000..0b88a8a
--- /dev/null
+++ b/dist/index.d.ts
@@ -0,0 +1,71 @@
+import Emitter from "component-emitter";
+/**
+ * Protocol version.
+ *
+ * @public
+ */
+export declare const protocol: number;
+export declare enum PacketType {
+    CONNECT = 0,
+    DISCONNECT = 1,
+    EVENT = 2,
+    ACK = 3,
+    ERROR = 4,
+    BINARY_EVENT = 5,
+    BINARY_ACK = 6
+}
+export interface Packet {
+    type: PacketType;
+    nsp: string;
+    data?: any;
+    id?: number;
+    attachments?: number;
+}
+/**
+ * A socket.io Encoder instance
+ */
+export declare class Encoder {
+    /**
+     * Encode a packet as a single string if non-binary, or as a
+     * buffer sequence, depending on packet type.
+     *
+     * @param {Object} obj - packet object
+     */
+    encode(obj: Packet): any[];
+    /**
+     * Encode packet as string.
+     */
+    private encodeAsString;
+    /**
+     * Encode packet as 'buffer sequence' by removing blobs, and
+     * deconstructing packet into object with placeholders and
+     * a list of buffers.
+     */
+    private encodeAsBinary;
+}
+/**
+ * A socket.io Decoder instance
+ *
+ * @return {Object} decoder
+ */
+export declare class Decoder extends Emitter {
+    private reconstructor;
+    constructor();
+    /**
+     * Decodes an encoded packet string into packet JSON.
+     *
+     * @param {String} obj - encoded packet
+     */
+    add(obj: any): void;
+    /**
+     * Decode a packet String (JSON data)
+     *
+     * @param {String} str
+     * @return {Object} packet
+     */
+    private decodeString;
+    /**
+     * Deallocates a parser's resources
+     */
+    destroy(): void;
+}
diff --git a/dist/index.js b/dist/index.js
new file mode 100644
index 0000000..732933d
--- /dev/null
+++ b/dist/index.js
@@ -0,0 +1,268 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Decoder = exports.Encoder = exports.PacketType = exports.protocol = void 0;
+const component_emitter_1 = __importDefault(require("component-emitter"));
+const binary_1 = require("./binary");
+const is_binary_1 = __importDefault(require("./is-binary"));
+const debug_1 = __importDefault(require("debug"));
+const debug = debug_1.default("socket.io-parser");
+/**
+ * Protocol version.
+ *
+ * @public
+ */
+exports.protocol = 4;
+var PacketType;
+(function (PacketType) {
+    PacketType[PacketType["CONNECT"] = 0] = "CONNECT";
+    PacketType[PacketType["DISCONNECT"] = 1] = "DISCONNECT";
+    PacketType[PacketType["EVENT"] = 2] = "EVENT";
+    PacketType[PacketType["ACK"] = 3] = "ACK";
+    PacketType[PacketType["ERROR"] = 4] = "ERROR";
+    PacketType[PacketType["BINARY_EVENT"] = 5] = "BINARY_EVENT";
+    PacketType[PacketType["BINARY_ACK"] = 6] = "BINARY_ACK";
+})(PacketType = exports.PacketType || (exports.PacketType = {}));
+/**
+ * A socket.io Encoder instance
+ */
+class Encoder {
+    /**
+     * Encode a packet as a single string if non-binary, or as a
+     * buffer sequence, depending on packet type.
+     *
+     * @param {Object} obj - packet object
+     */
+    encode(obj) {
+        debug("encoding packet %j", obj);
+        if (obj.type === PacketType.BINARY_EVENT ||
+            obj.type === PacketType.BINARY_ACK) {
+            return this.encodeAsBinary(obj);
+        }
+        else {
+            const encoding = this.encodeAsString(obj);
+            return [encoding];
+        }
+    }
+    /**
+     * Encode packet as string.
+     */
+    encodeAsString(obj) {
+        // first is type
+        let str = "" + obj.type;
+        // attachments if we have them
+        if (obj.type === PacketType.BINARY_EVENT ||
+            obj.type === PacketType.BINARY_ACK) {
+            str += obj.attachments + "-";
+        }
+        // if we have a namespace other than `/`
+        // we append it followed by a comma `,`
+        if (obj.nsp && "/" !== obj.nsp) {
+            str += obj.nsp + ",";
+        }
+        // immediately followed by the id
+        if (null != obj.id) {
+            str += obj.id;
+        }
+        // json data
+        if (null != obj.data) {
+            str += JSON.stringify(obj.data);
+        }
+        debug("encoded %j as %s", obj, str);
+        return str;
+    }
+    /**
+     * Encode packet as 'buffer sequence' by removing blobs, and
+     * deconstructing packet into object with placeholders and
+     * a list of buffers.
+     */
+    encodeAsBinary(obj) {
+        const deconstruction = binary_1.deconstructPacket(obj);
+        const pack = this.encodeAsString(deconstruction.packet);
+        const buffers = deconstruction.buffers;
+        buffers.unshift(pack); // add packet info to beginning of data list
+        return buffers; // write all the buffers
+    }
+}
+exports.Encoder = Encoder;
+/**
+ * A socket.io Decoder instance
+ *
+ * @return {Object} decoder
+ */
+class Decoder extends component_emitter_1.default {
+    constructor() {
+        super();
+    }
+    /**
+     * Decodes an encoded packet string into packet JSON.
+     *
+     * @param {String} obj - encoded packet
+     */
+    add(obj) {
+        let packet;
+        if (typeof obj === "string") {
+            packet = this.decodeString(obj);
+            if (packet.type === PacketType.BINARY_EVENT ||
+                packet.type === PacketType.BINARY_ACK) {
+                // binary packet's json
+                this.reconstructor = new BinaryReconstructor(packet);
+                // no attachments, labeled binary but no binary data to follow
+                if (packet.attachments === 0) {
+                    super.emit("decoded", packet);
+                }
+            }
+            else {
+                // non-binary full packet
+                super.emit("decoded", packet);
+            }
+        }
+        else if (is_binary_1.default(obj) || obj.base64) {
+            // raw binary data
+            if (!this.reconstructor) {
+                throw new Error("got binary data when not reconstructing a packet");
+            }
+            else {
+                packet = this.reconstructor.takeBinaryData(obj);
+                if (packet) {
+                    // received final buffer
+                    this.reconstructor = null;
+                    super.emit("decoded", packet);
+                }
+            }
+        }
+        else {
+            throw new Error("Unknown type: " + obj);
+        }
+    }
+    /**
+     * Decode a packet String (JSON data)
+     *
+     * @param {String} str
+     * @return {Object} packet
+     */
+    decodeString(str) {
+        let i = 0;
+        // look up type
+        const p = {
+            type: Number(str.charAt(0)),
+        };
+        if (PacketType[p.type] === undefined) {
+            throw new Error("unknown packet type " + p.type);
+        }
+        // look up attachments if type binary
+        if (p.type === PacketType.BINARY_EVENT ||
+            p.type === PacketType.BINARY_ACK) {
+            const start = i + 1;
+            while (str.charAt(++i) !== "-" && i != str.length) { }
+            const buf = str.substring(start, i);
+            if (buf != Number(buf) || str.charAt(i) !== "-") {
+                throw new Error("Illegal attachments");
+            }
+            p.attachments = Number(buf);
+        }
+        // look up namespace (if any)
+        if ("/" === str.charAt(i + 1)) {
+            const start = i + 1;
+            while (++i) {
+                const c = str.charAt(i);
+                if ("," === c)
+                    break;
+                if (i === str.length)
+                    break;
+            }
+            p.nsp = str.substring(start, i);
+        }
+        else {
+            p.nsp = "/";
+        }
+        // look up id
+        const next = str.charAt(i + 1);
+        if ("" !== next && Number(next) == next) {
+            const start = i + 1;
+            while (++i) {
+                const c = str.charAt(i);
+                if (null == c || Number(c) != c) {
+                    --i;
+                    break;
+                }
+                if (i === str.length)
+                    break;
+            }
+            p.id = Number(str.substring(start, i + 1));
+        }
+        // look up json data
+        if (str.charAt(++i)) {
+            const payload = tryParse(str.substr(i));
+            const isPayloadValid = payload !== false &&
+                (p.type === PacketType.ERROR || Array.isArray(payload));
+            if (isPayloadValid) {
+                p.data = payload;
+            }
+            else {
+                throw new Error("invalid payload");
+            }
+        }
+        debug("decoded %s as %j", str, p);
+        return p;
+    }
+    /**
+     * Deallocates a parser's resources
+     */
+    destroy() {
+        if (this.reconstructor) {
+            this.reconstructor.finishedReconstruction();
+        }
+    }
+}
+exports.Decoder = Decoder;
+function tryParse(str) {
+    try {
+        return JSON.parse(str);
+    }
+    catch (e) {
+        return false;
+    }
+}
+/**
+ * A manager of a binary event's 'buffer sequence'. Should
+ * be constructed whenever a packet of type BINARY_EVENT is
+ * decoded.
+ *
+ * @param {Object} packet
+ * @return {BinaryReconstructor} initialized reconstructor
+ */
+class BinaryReconstructor {
+    constructor(packet) {
+        this.packet = packet;
+        this.buffers = [];
+        this.reconPack = packet;
+    }
+    /**
+     * Method to be called when binary data received from connection
+     * after a BINARY_EVENT packet.
+     *
+     * @param {Buffer | ArrayBuffer} binData - the raw binary data received
+     * @return {null | Object} returns null if more binary data is expected or
+     *   a reconstructed packet object if all buffers have been received.
+     */
+    takeBinaryData(binData) {
+        this.buffers.push(binData);
+        if (this.buffers.length === this.reconPack.attachments) {
+            // done with buffer list
+            const packet = binary_1.reconstructPacket(this.reconPack, this.buffers);
+            this.finishedReconstruction();
+            return packet;
+        }
+        return null;
+    }
+    /**
+     * Cleans up binary packet reconstruction variables.
+     */
+    finishedReconstruction() {
+        this.reconPack = null;
+        this.buffers = [];
+    }
+}
diff --git a/dist/is-binary.d.ts b/dist/is-binary.d.ts
new file mode 100644
index 0000000..9b284a8
--- /dev/null
+++ b/dist/is-binary.d.ts
@@ -0,0 +1,6 @@
+/**
+ * Returns true if obj is a Buffer, an ArrayBuffer, a Blob or a File.
+ *
+ * @private
+ */
+export default function isBinary(obj: any): boolean;
diff --git a/dist/is-binary.js b/dist/is-binary.js
new file mode 100644
index 0000000..41c3f42
--- /dev/null
+++ b/dist/is-binary.js
@@ -0,0 +1,28 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const withNativeBuffer = typeof Buffer === "function" && typeof Buffer.isBuffer === "function";
+const withNativeArrayBuffer = typeof ArrayBuffer === "function";
+const isView = (obj) => {
+    return typeof ArrayBuffer.isView === "function"
+        ? ArrayBuffer.isView(obj)
+        : obj.buffer instanceof ArrayBuffer;
+};
+const toString = Object.prototype.toString;
+const withNativeBlob = typeof Blob === "function" ||
+    (typeof Blob !== "undefined" &&
+        toString.call(Blob) === "[object BlobConstructor]");
+const withNativeFile = typeof File === "function" ||
+    (typeof File !== "undefined" &&
+        toString.call(File) === "[object FileConstructor]");
+/**
+ * Returns true if obj is a Buffer, an ArrayBuffer, a Blob or a File.
+ *
+ * @private
+ */
+function isBinary(obj) {
+    return ((withNativeBuffer && Buffer.isBuffer(obj)) ||
+        (withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj))) ||
+        (withNativeBlob && obj instanceof Blob) ||
+        (withNativeFile && obj instanceof File));
+}
+exports.default = isBinary;