Fix patch and getSizeOfAllModules in DeltaPatcher

Author: jhen0409

app/middlewares/delta/DeltaPatcher.js

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  *
  * @format
-*/
+ */
 
 import { checkFetchExists, patchFetchPolyfill } from './patchFetchPolyfill';
 
@@ -56,8 +56,9 @@ export default class DeltaPatcher {
   applyDelta(deltaBundle) {
     const isOld = deltaBundle.id;
     // Make sure that the first received delta is a fresh one.
-    if (isOld ? !this._initialized && !deltaBundle.reset :
-      !this._initialized && !deltaBundle.base) {
+    if (
+      isOld ? !this._initialized && !deltaBundle.reset : !this._initialized && !deltaBundle.base
+    ) {
       throw new Error('DeltaPatcher should receive a fresh Delta when being initialized');
     }
 
@@ -80,9 +81,9 @@ export default class DeltaPatcher {
       };
     }
 
-    this._lastNumModifiedFiles = isOld ?
-      deltaBundle.pre.size + deltaBundle.post.size + deltaBundle.delta.size :
-      deltaBundle.modules.length;
+    this._lastNumModifiedFiles = isOld
+      ? deltaBundle.pre.size + deltaBundle.post.size + deltaBundle.delta.size
+      : deltaBundle.modules.length;
 
     if (deltaBundle.deleted) {
       this._lastNumModifiedFiles += deltaBundle.deleted.length;
@@ -101,9 +102,7 @@ export default class DeltaPatcher {
 
       this._lastBundle.id = deltaBundle.id;
     } else {
-      for (const [key, value] of deltaBundle.modules) {
-        this._lastBundle.modules.set(key, value);
-      }
+      this._patchMap(this._lastBundle.modules, deltaBundle.modules);
 
       if (deltaBundle.deleted) {
         for (const id of deltaBundle.deleted) {
@@ -136,19 +135,22 @@ export default class DeltaPatcher {
   }
 
   getAllModules(isOld) {
-    return isOld ? [].concat(
-      Array.from(this._lastBundle.pre.values()),
-      Array.from(this._lastBundle.modules.values()),
-      Array.from(this._lastBundle.post.values())
-    ) : [].concat(
-      [this._lastBundle.pre],
-      Array.from(this._lastBundle.modules.values()),
-      [this._lastBundle.post]
-    );
+    return isOld
+      ? [].concat(
+        Array.from(this._lastBundle.pre.values()),
+        Array.from(this._lastBundle.modules.values()),
+        Array.from(this._lastBundle.post.values())
+      )
+      : [].concat([this._lastBundle.pre], Array.from(this._lastBundle.modules.values()), [
+        this._lastBundle.post,
+      ]);
   }
 
   getSizeOfAllModules() {
-    return this._lastBundle.pre.size + this._lastBundle.modules.size + this._lastBundle.post.size;
+    // Support legacy DeltaPatcher
+    const preSize = this._lastBundle.pre instanceof Map ? this._lastBundle.pre.size : 1;
+    const postSize = this._lastBundle.post instanceof Map ? this._lastBundle.post.size : 1;
+    return preSize + this._lastBundle.modules.size + postSize;
   }
 
   _patchMap(original, patch) {

app/middlewares/delta/patchFetchPolyfill.js

@@ -26,5 +26,11 @@ const toggleFlag = 'fetch.polyfill = true';
 const toggleReplaceStr = `${toggleFlag};self.__NETWORK_INSPECT__ && self.__NETWORK_INSPECT__(true)`;
 
 export const checkFetchExists = code => isFetch.some(regex => regex.test(code));
-export const patchFetchPolyfill = code =>
-  code.replace(fetchSupportFlag, fetchSupportReplaceStr).replace(toggleFlag, toggleReplaceStr);
+export const patchFetchPolyfill = code => {
+  if (Array.isArray(code)) {
+    return code.map(item => (typeof item === 'string' ? patchFetchPolyfill(item) : item));
+  }
+  return code
+    .replace(fetchSupportFlag, fetchSupportReplaceStr)
+    .replace(toggleFlag, toggleReplaceStr);
+};