Implement inter-module virtual global scope passing (#16800)

- This allows the `renamePrefixPrefix` option to actually work.
- Passes the intermediate bundle info to the extension wrapper.
- Renames modules so that they have the same names as production JS files.
- Factors wrapper into common module shared between legacy and new compilation.
- Removes the notion of the base bundle, because with that we need 2 wrappers in the main binary which is bad (e.g. for source maps).
- This is also a code size win. Main binary now at 214K.

.eslintignore

@@ -3,6 +3,7 @@ build
 dist
 dist.3p
 dist.tools
+out
 examples
 third_party
 test/coverage

build-system/amp.extern.js

@@ -48,7 +48,7 @@ function ExtensionPayload() {}
 /** @type {string} */
 ExtensionPayload.prototype.n;
 
-/** @type {function(!Object)} */
+/** @type {function(!Object,!Object)} */
 ExtensionPayload.prototype.f;
 
 /** @type {string|undefined} */
@@ -99,6 +99,7 @@ window.AMP_TEST;
 window.AMP_TEST_IFRAME;
 window.AMP_TAG;
 window.AMP = {};
+window.AMP._ = {};
 
 /** @constructor */
 function AmpConfigType() {}

build-system/base.js

@@ -13,11 +13,3 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
-/* eslint "no-unused-vars": 0 */
-/** @const {!Object}  */
-const process = {
-  env: {
-    'NODE_ENV': 'production',
-  },
-};

build-system/compile-wrappers.js

@@ -0,0 +1,55 @@
+/**
+ * Copyright 2018 The AMP HTML Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const {VERSION} = require('./internal-version');
+
+// If there is a sync JS error during initial load,
+// at least try to unhide the body.
+exports.mainBinary = 'var global=self;self.AMP=self.AMP||[];' +
+    'try{(function(_){<%= contents %>})(AMP._={})}catch(e){' +
+    'setTimeout(function(){' +
+    'var s=document.body.style;' +
+    's.opacity=1;' +
+    's.visibility="visible";' +
+    's.animation="none";' +
+    's.WebkitAnimation="none;"},1000);throw e};';
+
+exports.extension = function(name, loadPriority, intermediateDeps) {
+  let deps = '';
+  if (intermediateDeps) {
+    deps = 'i:';
+    function quote(s) {
+      return `"${s}"`;
+    }
+    if (intermediateDeps.length == 1) {
+      deps += quote(intermediateDeps[0]);
+    } else {
+      deps += `[${intermediateDeps.map(quote).join(',')}]`;
+    }
+    deps += ',';
+  }
+  let priority = '';
+  if (loadPriority) {
+    if (loadPriority != 'high') {
+      throw new Error('Unsupported loadPriority: ' + loadPriority);
+    }
+    priority = 'p:"high",';
+  }
+  return `(self.AMP=self.AMP||[]).push({n:"${name}",${priority}${deps}` +
+      `v:"${VERSION}",f:(function(AMP,_){<%= contents %>\n})});`;
+};
+
+exports.none = '<%= contents %>';