expose preserveWhitespace option

Author: yyx990803

lib/template-compiler.js

@@ -9,8 +9,8 @@ var hotReloadAPIPath = normalize.dep('vue-hot-reload-api')
 var defaultTransformToRequire = {
   img: 'src'
 }
-var transformToRequire = Object.assign({}, defaultTransformToRequire)
-var options = {
+var transformToRequire = defaultTransformToRequire
+var defaultCompileOptions = {
   modules: [{
     postTransformNode (el) {
       for (var tag in transformToRequire) {
@@ -51,9 +51,15 @@ module.exports = function (html) {
   var isServer = this.options.target === 'node'
   var vueOptions = this.options.__vueOptions__
   if (vueOptions.transformToRequire) {
-    Object.assign(transformToRequire, vueOptions.transformToRequire)
+    transformToRequire = Object.assign(
+      {},
+      defaultTransformToRequire,
+      vueOptions.transformToRequire
+    )
   }
-  var compiled = compiler.compile(html, options)
+  var compiled = compiler.compile(html, Object.assign({
+    preserveWhitespace: vueOptions.preserveWhitespace
+  }, defaultCompileOptions))
   var code
   if (compiled.errors.length) {
     var self = this