lib,tools: use object spread instead of Object.assign() where possible

Author: belochub

lib/session.js

@@ -37,7 +37,7 @@ class Session extends Map {
   // for Session objects when exporting the Session objects.
   //
   toString() {
-    const copy = Object.assign({}, this);
+    const copy = { ...this };
     copy.storage = Array.from(this);
     function replacer(key, value) {
       switch (key) {

lib/ws-internal.js

@@ -85,12 +85,13 @@ const allowAllOriginCheckStrategy = function(/* origin */) {
 };
 
 const initServer = function(options, httpServer) {
-  options = Object.assign({}, options, {
+  options = {
+    ...options,
     httpServer,
     autoAcceptConnections: false,
     maxReceivedFrameSize: constants.MAX_MESSAGE_SIZE,
     maxReceivedMessageSize: constants.MAX_MESSAGE_SIZE,
-  });
+  };
 
   httpServer.isOriginAllowed =
     options.originCheckStrategy || allowAllOriginCheckStrategy;

tools/prepare-release.js

@@ -137,12 +137,10 @@ function getSemverTag(repo, id) {
 }
 
 function httpsGetJson(options) {
-  options = Object.assign(
-    {
-      headers: { 'User-Agent': 'metarhia-jstp-release-tool' },
-    },
-    options
-  );
+  options = {
+    headers: { 'User-Agent': 'metarhia-jstp-release-tool' },
+    ...options,
+  };
   if (token) {
     options.headers['Authorization'] = `token ${token}`;
   }