add prefetch method (#4062)

ampproject · Jul 14, 2016 · 979cb6b · 979cb6b
1 parent af63a88
commit 979cb6b
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diff --git a/build-system/tasks/presubmit-checks.js b/build-system/tasks/presubmit-checks.js
@@ -72,6 +72,9 @@ var forbiddenTerms = {
       'dist.3p/current/integration.js'
     ]
   },
+  '\\.prefetch\\(': {
+    message: 'Do not use preconnect.prefetch, use preconnect.preload instead.'
+  },
   'iframePing': {
     message: 'This is only available in vendor config for ' +
         'temporary workarounds.',

diff --git a/src/preconnect.js b/src/preconnect.js
@@ -127,6 +127,18 @@ export class Preconnect {
     this.preconnectPolyfill_(origin);
   }
 
+  /**
+   * Temporary to not break prod when versions are misaligned across binaries.
+   * DO NOT USE!
+   * This should be safe to remove 1 version after 1468017284333 hits prod.
+   * @param {string} url
+   * @param {string=} opt_preloadAs
+   * @deprecated
+   */
+  prefetch(url, opt_preloadAs) {
+    this.preload(url, opt_preloadAs);
+  }
+
   /**
    * Asks the browser to preload a URL. Always also does a preconnect
    * because browser support for that is better.