install gulp to process code

node_modules/vinyl-fs/lib/src/read-contents/read-buffer.js

@@ -0,0 +1,37 @@
+'use strict';
+
+var fs = require('graceful-fs');
+
+var getCodec = require('../../codecs');
+var DEFAULT_ENCODING = require('../../constants').DEFAULT_ENCODING;
+
+function bufferFile(file, optResolver, onRead) {
+  var encoding = optResolver.resolve('encoding', file);
+  var codec = getCodec(encoding);
+  if (encoding && !codec) {
+    return onRead(new Error('Unsupported encoding: ' + encoding));
+  }
+
+  fs.readFile(file.path, onReadFile);
+
+  function onReadFile(readErr, contents) {
+    if (readErr) {
+      return onRead(readErr);
+    }
+
+    if (encoding) {
+      var removeBOM = codec.bomAware && optResolver.resolve('removeBOM', file);
+
+      if (removeBOM || codec.enc !== DEFAULT_ENCODING) {
+        contents = codec.decode(contents, { removeBOM: removeBOM });
+        contents = getCodec(DEFAULT_ENCODING).encode(contents);
+      }
+    }
+
+    file.contents = contents;
+
+    onRead();
+  }
+}
+
+module.exports = bufferFile;