feat: uninstall command for installed binaries

lib/Serverless.js

@@ -18,7 +18,7 @@ const ServerlessError = require('./classes/Error').ServerlessError;
 const Version = require('./../package.json').version;
 const isStandaloneExecutable = require('./utils/isStandaloneExecutable');
 
-const installationMaintananceCommands = new Set(['upgrade']);
+const installationMaintananceCommands = new Set(['uninstall', 'upgrade']);
 
 class Serverless {
   constructor(config) {

lib/plugins/executable/index.js

@@ -24,12 +24,20 @@ module.exports = class Executable {
         usage: 'Upgrade Serverless',
         lifecycleEvents: ['upgrade'],
       },
+      uninstall: {
+        isHidden: !isStandaloneExecutable,
+        usage: 'Uninstall Serverless',
+        lifecycleEvents: ['uninstall'],
+      },
     };
 
     this.hooks = {
       'upgrade:upgrade': () => {
         return isStandaloneExecutable ? this.upgrade() : this.rejectCommand('upgrade');
       },
+      'uninstall:uninstall': () => {
+        return isStandaloneExecutable ? this.uninstall() : this.rejectCommand('uninstall');
+      },
     };
   }
 
@@ -89,6 +97,10 @@ module.exports = class Executable {
       });
   }
 
+  uninstall() {
+    return fse.removeAsync(BINARIES_DIR_PATH).then(() => this.serverless.cli.log('Uninstalled'));
+  }
+
   rejectCommand(command) {
     throw new this.serverless.classes.Error(
       `\`${command}\` command is supported only in context of a standalone exacutable instance ` +

scripts/postinstall.js

@@ -8,15 +8,21 @@ const isPathDependent =
 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)) {
+  const messageTokens = ['Serverless Framework successfully installed!'];
+  if (isPathDependent) {
+    messageTokens.push(
+      'To start your first project, please open another terminal and run “serverless”.',
+      'You can uninstall at anytime by running “serverless uninstall”.'
+    );
+  } else {
+    messageTokens.push('To start your first project run “serverless”.');
+  }
   process.stdout.write(
-    `${boxen(
-      chalk.yellow(
-        `Serverless Framework successfully installed!\nTo start your first project, ${
-          isPathDependent ? 'please open another terminal and ' : ''
-        }run “serverless”.`
-      ),
-      { padding: 1, margin: 1, borderColor: 'yellow' }
-    )}\n`
+    `${boxen(chalk.yellow(messageTokens.join('\n\n')), {
+      padding: 1,
+      margin: 1,
+      borderColor: 'yellow',
+    })}\n`
   );
 }