Switch emojis to log-symbols for terminal compatibility (#363)

* Don't show emoji on windows.

* Use log-symbols

* Emoji with fallback for windows

src/Bundler.js

@@ -13,6 +13,7 @@ const Logger = require('./Logger');
 const PackagerRegistry = require('./packagers');
 const localRequire = require('./utils/localRequire');
 const config = require('./utils/config');
+const emoji = require('./utils/emoji');
 
 /**
  * The Bundler is the main entry point. It resolves and loads assets,
@@ -122,7 +123,7 @@ class Bundler extends EventEmitter {
     this.errored = false;
 
     this.logger.clear();
-    this.logger.status('⏳', 'Building...');
+    this.logger.status(emoji.progress, 'Building...');
 
     try {
       // Start worker farm, watcher, etc. if needed
@@ -144,7 +145,7 @@ class Bundler extends EventEmitter {
         buildTime < 1000
           ? `${buildTime}ms`
           : `${(buildTime / 1000).toFixed(2)}s`;
-      this.logger.status('✨', `Built in ${time}.`, 'green');
+      this.logger.status(emoji.success, `Built in ${time}.`, 'green');
 
       return bundle;
     } catch (err) {
@@ -304,7 +305,7 @@ class Bundler extends EventEmitter {
     }
 
     if (!this.errored) {
-      this.logger.status('⏳', `Building ${asset.basename}...`);
+      this.logger.status(emoji.progress, `Building ${asset.basename}...`);
     }
 
     // Mark the asset processed so we don't load it twice
@@ -461,7 +462,7 @@ class Bundler extends EventEmitter {
     }
 
     this.logger.clear();
-    this.logger.status('⏳', `Building ${asset.basename}...`);
+    this.logger.status(emoji.progress, `Building ${asset.basename}...`);
 
     // Add the asset to the rebuild queue, and reset the timeout.
     this.buildQueue.add(asset);

src/Logger.js

@@ -1,6 +1,7 @@
 const chalk = require('chalk');
 const readline = require('readline');
 const prettyError = require('./utils/prettyError');
+const emoji = require('./utils/emoji');
 
 class Logger {
   constructor(options) {
@@ -51,7 +52,7 @@ class Logger {
 
     let {message, stack} = prettyError(err, {color: this.color});
 
-    this.status('🚨', message, 'red');
+    this.status(emoji.error, message, 'red');
     if (stack) {
       this.write(stack);
     }

src/utils/emoji.js

@@ -0,0 +1,6 @@
+const supportsEmoji = process.platform !== 'win32' || process.env.VSCODE_PID;
+
+// Fallback symbols for Windows from https://en.wikipedia.org/wiki/Code_page_437
+exports.progress = supportsEmoji ? '⏳' : '∞';
+exports.success = supportsEmoji ? '✨' : '√';
+exports.error = supportsEmoji ? '🚨' : '×';