diff --git a/package.json b/package.json
index 4c23815..798f551 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "lint": "aegir lint",
     "test:node": "aegir test -t node",
     "test:browser": "aegir test -t browser -t webworker",
-    "build": "aegir build",
+    "prepare": "aegir build --no-bundle",
     "docs": "aegir docs",
     "release": "aegir release",
     "release-minor": "aegir release --type minor",
@@ -36,18 +36,26 @@
     "url": "https://github.com/libp2p/js-libp2p-record/issues"
   },
   "homepage": "https://github.com/libp2p/js-libp2p-record",
+  "files": [
+    "src",
+    "dist"
+  ],
+  "eslintConfig": {
+    "extends": "ipfs"
+  },
+  "types": "dist/src/index.d.ts",
   "devDependencies": {
-    "aegir": "^25.0.0",
-    "libp2p-crypto": "^0.18.0",
+    "aegir": "^30.3.0",
+    "libp2p-crypto": "^0.19.0",
     "multibase": "^3.0.0",
     "peer-id": "^0.14.0"
   },
   "dependencies": {
-    "err-code": "^2.0.0",
+    "err-code": "^3.0.0",
     "multihashes": "^3.0.1",
-    "multihashing-async": "^2.0.1",
+    "multihashing-async": "^2.1.0",
     "protons": "^2.0.0",
-    "uint8arrays": "^1.1.0"
+    "uint8arrays": "^2.0.5"
   },
   "contributors": [
     "Vasco Santos <vasco.santos@moxy.studio>",
diff --git a/src/record.js b/src/record.js
index f80f3ff..3bf2124 100644
--- a/src/record.js
+++ b/src/record.js
@@ -1,16 +1,21 @@
 'use strict'
 
+// @ts-ignore
 const protons = require('protons')
 const pb = protons(require('./record.proto')).Record
 const utils = require('./utils')
 
+/**
+ * @typedef {{ key: Uint8Array, value: Uint8Array, timeReceived: string }} ProtobufRecord
+ */
+
 class Record {
   /**
    * @param {Uint8Array} [key]
    * @param {Uint8Array} [value]
-   * @param {Date} [recvtime]
+   * @param {Date} [timeReceived]
    */
-  constructor (key, value, recvtime) {
+  constructor (key, value, timeReceived) {
     if (!(key instanceof Uint8Array)) {
       throw new Error('key must be a Uint8Array')
     }
@@ -21,20 +26,15 @@ class Record {
 
     this.key = key
     this.value = value
-    this.timeReceived = recvtime
+    this.timeReceived = timeReceived
   }
 
-  /**
-   * @returns {Uint8Array}
-   */
   serialize () {
     return pb.encode(this.prepareSerialize())
   }
 
   /**
    * Return the object format ready to be given to the protobuf library.
-   *
-   * @returns {Object}
    */
   prepareSerialize () {
     return {
@@ -48,7 +48,6 @@ class Record {
    * Decode a protobuf encoded record.
    *
    * @param {Uint8Array} raw
-   * @returns {Record}
    */
   static deserialize (raw) {
     const dec = pb.decode(raw)
@@ -58,8 +57,7 @@ class Record {
   /**
    * Create a record from the raw object returned from the protobuf library.
    *
-   * @param {Object} obj
-   * @returns {Record}
+   * @param {ProtobufRecord} obj
    */
   static fromDeserialized (obj) {
     let recvtime
diff --git a/src/selection.js b/src/selection.js
index c2a7f3b..0754030 100644
--- a/src/selection.js
+++ b/src/selection.js
@@ -6,10 +6,9 @@ const uint8ArrayToString = require('uint8arrays/to-string')
 /**
  * Select the best record out of the given records.
  *
- * @param {Object} selectors
+ * @param {{ [key: string]: function (Uint8Array, Uint8Array[]): number }} selectors
  * @param {Uint8Array} k
  * @param {Array<Uint8Array>} records
- * @returns {number} - The index of the best record.
  */
 const bestRecord = (selectors, k, records) => {
   if (records.length === 0) {
diff --git a/src/selectors/public-key.js b/src/selectors/public-key.js
index db0790b..ee62ef3 100644
--- a/src/selectors/public-key.js
+++ b/src/selectors/public-key.js
@@ -7,7 +7,6 @@
  *
  * @param {Uint8Array} k
  * @param {Array<Uint8Array>} records
- * @returns {number}
  */
 const publicKeySelector = (k, records) => {
   return 0
diff --git a/src/utils.js b/src/utils.js
index 73490fc..b9bd032 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -5,7 +5,6 @@
  * string.
  *
  * @param {Date} time
- * @returns {string}
  */
 module.exports.toRFC3339 = (time) => {
   const year = time.getUTCFullYear()
@@ -25,7 +24,6 @@ module.exports.toRFC3339 = (time) => {
  * JavaScript Date object.
  *
  * @param {string} time
- * @returns {Date}
  */
 module.exports.parseRFC3339 = (time) => {
   const rfc3339Matcher = new RegExp(
diff --git a/src/validator.js b/src/validator.js
index 43452dd..405aa83 100644
--- a/src/validator.js
+++ b/src/validator.js
@@ -3,14 +3,17 @@
 const errcode = require('err-code')
 const uint8ArrayToString = require('uint8arrays/to-string')
 
+/**
+ * @typedef {import('./record')} Record
+ */
+
 /**
  * Checks a record and ensures it is still valid.
  * It runs the needed validators.
  * If verification fails the returned Promise will reject with the error.
  *
- * @param {Object} validators
+ * @param {{ [key: string]: { func: (key: Uint8Array, value: Uint8Array) => Promise<void> }}} validators
  * @param {Record} record
- * @returns {Promise}
  */
 const verifyRecord = (validators, record) => {
   const key = record.key
diff --git a/src/validators/public-key.js b/src/validators/public-key.js
index 55c653d..5dcd7a9 100644
--- a/src/validators/public-key.js
+++ b/src/validators/public-key.js
@@ -13,7 +13,6 @@ const uint8ArrayEquals = require('uint8arrays/equals')
  *
  * @param {Uint8Array} key - A valid key is of the form `'/pk/<keymultihash>'`
  * @param {Uint8Array} publicKey - The public key to validate against (protobuf encoded).
- * @returns {Promise}
  */
 const validatePublicKeyRecord = async (key, publicKey) => {
   if (!(key instanceof Uint8Array)) {
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..07e8db2
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "extends": "aegir/src/config/tsconfig.aegir.json",
+  "compilerOptions": {
+      "outDir": "dist"
+  },
+  "include": [
+    "test",
+    "src"
+  ]
+}