Merge pull request serverless#6238 from serverless/serveless-command-ad

PLAT-1091 - message in `npm i` output about the `serverless` quickstart command

scripts/postinstall.js

@@ -1,12 +1,28 @@
 'use strict';
 
 const path = require('path');
+const chalk = require('chalk');
 
 /* eslint-disable no-console */
 
 const Serverless = require('../lib/Serverless');
 const execSync = require('child_process').execSync;
 
+const truthyStr = val => val && !['0', 'false', 'f', 'n', 'no'].includes(val.toLowerCase());
+const { CI, ADBLOCK, SILENT } = process.env;
+if (!truthyStr(CI) && !truthyStr(ADBLOCK) && !truthyStr(SILENT)) {
+  console.log(
+    chalk.yellow(`\
+ +------------------------------------------------------------------+
+ |                                                                  |
+ |  Serverless Framework successfully installed!                    |
+ |  To start your first project, run “serverless” in a new folder.  |
+ |                                                                  |
+ +------------------------------------------------------------------+
+`)
+  );
+}
+
 try {
   const serverless = new Serverless();