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node_modules/vue-style-loader/lib/addStylesShadow.js

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+import listToStyles from './listToStyles'
+
+export default function addStylesToShadowDOM (parentId, list, shadowRoot) {
+  var styles = listToStyles(parentId, list)
+  addStyles(styles, shadowRoot)
+}
+
+/*
+type StyleObject = {
+  id: number;
+  parts: Array<StyleObjectPart>
+}
+
+type StyleObjectPart = {
+  css: string;
+  media: string;
+  sourceMap: ?string
+}
+*/
+
+function addStyles (styles /* Array<StyleObject> */, shadowRoot) {
+  const injectedStyles =
+    shadowRoot._injectedStyles ||
+    (shadowRoot._injectedStyles = {})
+  for (var i = 0; i < styles.length; i++) {
+    var item = styles[i]
+    var style = injectedStyles[item.id]
+    if (!style) {
+      for (var j = 0; j < item.parts.length; j++) {
+        addStyle(item.parts[j], shadowRoot)
+      }
+      injectedStyles[item.id] = true
+    }
+  }
+}
+
+function createStyleElement (shadowRoot) {
+  var styleElement = document.createElement('style')
+  styleElement.type = 'text/css'
+  shadowRoot.appendChild(styleElement)
+  return styleElement
+}
+
+function addStyle (obj /* StyleObjectPart */, shadowRoot) {
+  var styleElement = createStyleElement(shadowRoot)
+  var css = obj.css
+  var media = obj.media
+  var sourceMap = obj.sourceMap
+
+  if (media) {
+    styleElement.setAttribute('media', media)
+  }
+
+  if (sourceMap) {
+    // https://developer.chrome.com/devtools/docs/javascript-debugging
+    // this makes source maps inside style tags work properly in Chrome
+    css += '\n/*# sourceURL=' + sourceMap.sources[0] + ' */'
+    // http://stackoverflow.com/a/26603875
+    css += '\n/*# sourceMappingURL=data:application/json;base64,' + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + ' */'
+  }
+
+  if (styleElement.styleSheet) {
+    styleElement.styleSheet.cssText = css
+  } else {
+    while (styleElement.firstChild) {
+      styleElement.removeChild(styleElement.firstChild)
+    }
+    styleElement.appendChild(document.createTextNode(css))
+  }
+}