feat: new option "preserveWhitespace"

Author: yyx990803

docs/config.md

@@ -29,15 +29,16 @@ module.exports = {
   // explicitly transpile a dependency with this option.
   transpileDependencies: [/* string or regex */],
 
+  // whether to preserve whitespaces between elements during template
+  // compilation. Defaults to false for smaller compiled code size and
+  // performance.
+  preserveWhitepsace: false,
+
   // tweak internal webpack configuration.
   // see https://github.com/vuejs/vue-cli/blob/dev/docs/webpack.md
   chainWebpack: () => {},
   configureWebpack: () => {},
 
-  // vue-loader options
-  // https://vue-loader.vuejs.org/en/options.html
-  vueLoader: {},
-
   // generate sourceMap for production build?
   productionSourceMap: true,
 
@@ -47,16 +48,16 @@ module.exports = {
     // can also be an object of options to pass to extract-text-webpack-plugin
     extract: true,
 
+    // Enable CSS modules for all css / pre-processor files.
+    // This option does not affect *.vue files.
+    modules: false,
+
     // enable CSS source maps?
     sourceMap: false,
 
     // pass custom options to pre-processor loaders. e.g. to pass options to
     // sass-loader, use { sass: { ... } }
-    loaderOptions: {},
-
-    // Enable CSS modules for all css / pre-processor files.
-    // This option does not affect *.vue files.
-    modules: false
+    loaderOptions: {}
   },
 
   // use thread-loader for babel & TS in production build

packages/@vue/cli-service/lib/config/base.js

@@ -48,7 +48,7 @@ module.exports = (api, options) => {
           .loader('vue-loader')
           .options({
             compilerOpitons: {
-              preserveWhitespace: false
+              preserveWhitespace: options.preserveWhitespace
             }
           })
 

packages/@vue/cli-service/lib/options.js

@@ -5,6 +5,7 @@ const schema = createSchema(joi => joi.object({
   outputDir: joi.string(),
   compiler: joi.boolean(),
   transpileDependencies: joi.array(),
+  preserveWhitespace: joi.boolean(),
   productionSourceMap: joi.boolean(),
   parallel: joi.boolean(),
   devServer: joi.object(),
@@ -58,6 +59,9 @@ exports.defaults = () => ({
   // deps to transpile
   transpileDependencies: [/* string or regex */],
 
+  // whether to preserve whitespaces between elements
+  preserveWhitespace: false,
+
   // sourceMap for production build?
   productionSourceMap: true,