Merge branch 'master' into 2

documentation/index.html.js

@@ -115,7 +115,8 @@
     <p>
       The CoffeeScript compiler goes to great lengths to generate output JavaScript
       that runs in every JavaScript runtime, but there are exceptions. Use
-      <a href="#generator-functions">generator functions</a> or
+      <a href="#generator-functions">generator functions</a>,
+      <a href="#generator-iteration"><code>for&hellip;from</code></a>, or
       <a href="#tagged-template-literals">tagged template literals</a> only if you
       know that your <a href="http://kangax.github.io/compat-table/es6/">target
       runtimes can support them</a>. If you use <a href="#modules">modules</a>,

lib/coffee-script/coffee-script.js

@@ -28,7 +28,9 @@
       case typeof Buffer !== 'function':
         return Buffer.from(src).toString('base64');
       case typeof btoa !== 'function':
-        return btoa(src);
+        return btoa(encodeURIComponent(src).replace(/%([0-9A-F]{2})/g, function(match, p1) {
+          return String.fromCharCode('0x' + p1);
+        }));
       default:
         throw new Error('Unable to base64 encode inline sourcemap.');
     }

src/coffee-script.coffee

@@ -24,7 +24,12 @@ base64encode = (src) -> switch
   when typeof Buffer is 'function'
     Buffer.from(src).toString('base64')
   when typeof btoa is 'function'
-    btoa(src)
+    # The contents of a <script> block are encoded via UTF-16, so if any extended
+    # characters are used in the block, btoa will fail as it maxes out at UTF-8.
+    # See https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#The_Unicode_Problem
+    # for the gory details, and for the solution implemented here.
+    btoa encodeURIComponent(src).replace /%([0-9A-F]{2})/g, (match, p1) ->
+      String.fromCharCode '0x' + p1
   else
     throw new Error('Unable to base64 encode inline sourcemap.')