use static keyword

src/index.js

@@ -70,7 +70,6 @@ class PeerId {
    *  matching go-ipfs formatting.
    *
    * @returns {Buffer} - The marshalled public key
-   * @throws {Error} - Failure
    */
   marshalPubKey () {
     if (this.pubKey) {
@@ -138,9 +137,8 @@ class PeerId {
   toB58String () {
     return mh.toB58String(this.id)
   }
-}
 
-/**
+  /**
    * Create a new `PeerId` by generating a new public/private keypair.
    *
    * @param {Object=} opts - Configuration object.
@@ -159,7 +157,7 @@ class PeerId {
    * })
    *
    */
-PeerId.create = function (opts, callback) {
+  static create (opts, callback) {
     if (typeof opts === 'function') {
       callback = opts
       opts = {}
@@ -179,47 +177,47 @@ PeerId.create = function (opts, callback) {
 
       callback(null, new PeerId(digest, privKey))
     })
-}
+  }
 
-/**
+  /**
    * Creates a Peer ID from hex string representing the key's multihash.
    *
    * @param {string} str - Hex encoded id
    * @returns {PeerId}
    */
-PeerId.createFromHexString = function (str) {
+  static createFromHexString (str) {
     return new PeerId(mh.fromHexString(str))
-}
+  }
 
-/**
+  /**
    * Creates a Peer ID from a buffer representing the key's multihash.
    *
    * @param {Buffer} buf
    * @returns {PeerId}
    */
-PeerId.createFromBytes = function (buf) {
+  static createFromBytes (buf) {
     return new PeerId(buf)
-}
+  }
 
-/**
+  /**
    * Creates a Peer ID from a `base58` string representing the
    * key's multihash.
    *
    * @param {string} str - `base58` encoded id
    * @returns {PeerId}
    */
-PeerId.createFromB58String = function (str) {
+  static createFromB58String (str) {
     return new PeerId(mh.fromB58String(str))
-}
+  }
 
-/**
+  /**
    * Creates a Peer ID from a buffer containing a public key.
    *
    * @param {string|Buffer} key
    * @param {function(Error, PeerId)} callback
    * @returns {undefined}
    */
-PeerId.createFromPubKey = function (key, callback) {
+  static createFromPubKey (key, callback) {
     let buf = key
     if (typeof buf === 'string') {
       buf = new Buffer(key, 'base64')
@@ -237,9 +235,9 @@ PeerId.createFromPubKey = function (key, callback) {
 
       callback(null, new PeerId(digest, null, pubKey))
     })
-}
+  }
 
-/**
+  /**
    * Creates a Peer ID from a buffer containing a private key.
    *
    * @param {string|Buffer} key - The private key, if passed as
@@ -247,7 +245,7 @@ PeerId.createFromPubKey = function (key, callback) {
    * @param {function(Error, PeerId)} callback
    * @returns {undefined}
    */
-PeerId.createFromPrivKey = function (key, callback) {
+  static createFromPrivKey (key, callback) {
     let buf = key
     if (typeof buf === 'string') {
       buf = new Buffer(key, 'base64')
@@ -269,16 +267,16 @@ PeerId.createFromPrivKey = function (key, callback) {
 
       callback(null, new PeerId(digest, privKey))
     })
-}
+  }
 
-/**
+  /**
    * Import a `PeerId` from a serialized JSON object.
    *
    * @param {PeerIdJson} obj
    * @param {function(Error, PeerId)} callback
    * @returns {undefined}
    */
-PeerId.createFromJSON = function (obj, callback) {
+  static createFromJSON (obj, callback) {
     if (typeof callback !== 'function') {
       throw new Error('callback is required')
     }
@@ -321,6 +319,7 @@ PeerId.createFromJSON = function (obj, callback) {
     } else {
       callback(null, new PeerId(id, null, pub))
     }
+  }
 }
 
 /**