first commit

app_vue/node_modules/vue-style-loader/lib/addStylesServer.js

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+import listToStyles from './listToStyles'
+
+export default function addStylesServer (parentId, list, isProduction, context) {
+  if (!context && typeof __VUE_SSR_CONTEXT__ !== 'undefined') {
+    context = __VUE_SSR_CONTEXT__
+  }
+  if (context) {
+    if (!context.hasOwnProperty('styles')) {
+      Object.defineProperty(context, 'styles', {
+        enumerable: true,
+        get: function() {
+          return renderStyles(context._styles)
+        }
+      })
+      // expose renderStyles for vue-server-renderer (vuejs/#6353)
+      context._renderStyles = renderStyles
+    }
+
+    var styles = context._styles || (context._styles = {})
+    list = listToStyles(parentId, list)
+    if (isProduction) {
+      addStyleProd(styles, list)
+    } else {
+      addStyleDev(styles, list)
+    }
+  }
+}
+
+// In production, render as few style tags as possible.
+// (mostly because IE9 has a limit on number of style tags)
+function addStyleProd (styles, list) {
+  for (var i = 0; i < list.length; i++) {
+    var parts = list[i].parts
+    for (var j = 0; j < parts.length; j++) {
+      var part = parts[j]
+      // group style tags by media types.
+      var id = part.media || 'default'
+      var style = styles[id]
+      if (style) {
+        if (style.ids.indexOf(part.id) < 0) {
+          style.ids.push(part.id)
+          style.css += '\n' + part.css
+        }
+      } else {
+        styles[id] = {
+          ids: [part.id],
+          css: part.css,
+          media: part.media
+        }
+      }
+    }
+  }
+}
+
+// In dev we use individual style tag for each module for hot-reload
+// and source maps.
+function addStyleDev (styles, list) {
+  for (var i = 0; i < list.length; i++) {
+    var parts = list[i].parts
+    for (var j = 0; j < parts.length; j++) {
+      var part = parts[j]
+      styles[part.id] = {
+        ids: [part.id],
+        css: part.css,
+        media: part.media
+      }
+    }
+  }
+}
+
+function renderStyles (styles) {
+  var css = ''
+  for (var key in styles) {
+    var style = styles[key]
+    css += '<style data-vue-ssr-id="' + style.ids.join(' ') + '"' +
+        (style.media ? ( ' media="' + style.media + '"' ) : '') + '>' +
+        style.css + '</style>'
+  }
+  return css
+}