Add a brief summary to CLI's build output (#7439)

* feat(babel-cli): add a brief summary to build output

* address feedback

* further adjustments

* Use quiet output as default, add --verbose

* fix tests

* remove verbose alias

packages/babel-cli/src/babel/dir.js

@@ -6,6 +6,8 @@ import fs from "fs";
 
 import * as util from "./util";
 
+let compiledFiles = 0;
+
 export default function(commander, filenames, opts) {
   function write(src, relative, base, callback) {
     if (typeof base === "function") {
@@ -48,6 +50,8 @@ export default function(commander, filenames, opts) {
         outputFileSync(dest, res.code);
         util.chmod(src, dest);
 
+        compiledFiles += 1;
+
         util.log(src + " -> " + dest);
         return callback(null, true);
       },
@@ -125,10 +129,17 @@ export default function(commander, filenames, opts) {
     const filename = filenames[index];
 
     handle(filename, function(err) {
-      if (err) throw err;
+      if (err) throw new Error(err);
       index++;
       if (index !== filenames.length) {
         sequentialHandle(filenames, index);
+      } else {
+        util.log(
+          `🎉  Successfully compiled ${compiledFiles} ${
+            compiledFiles > 1 ? "files" : "file"
+          } with Babel.`,
+          true,
+        );
       }
     });
   }

packages/babel-cli/src/babel/index.js

@@ -163,7 +163,7 @@ commander.option(
   "--include-dotfiles",
   "Include dotfiles when compiling and copying non-compilable files",
 );
-commander.option("-q, --quiet", "Don't log anything");
+commander.option("--verbose", "Log everything");
 commander.option(
   "--delete-dir-on-start",
   "Delete the out directory before compilation",
@@ -243,7 +243,7 @@ delete opts.outFile;
 delete opts.outDir;
 delete opts.copyFiles;
 delete opts.includeDotfiles;
-delete opts.quiet;
+delete opts.verbose;
 delete opts.configFile;
 delete opts.deleteDirOnStart;
 delete opts.keepFileExtension;

packages/babel-cli/src/babel/util.js

@@ -46,8 +46,8 @@ export function addSourceMappingUrl(code, loc) {
   return code + "\n//# sourceMappingURL=" + path.basename(loc);
 }
 
-export function log(msg) {
-  if (!commander.quiet) console.log(msg);
+export function log(msg, force) {
+  if (force === true || commander.verbose) console.log(msg);
 }
 
 export function transform(filename, code, opts, callback) {