fix(webpack): invalidate cache by use of timestamps

src/webpack.ts

@@ -3,7 +3,7 @@ import { BuildContext, BuildState, File, TaskInfo } from './util/interfaces';
 import { BuildError, IgnorableError } from './util/errors';
 import { changeExtension, readFileAsync, setContext } from './util/helpers';
 import { emit, EventType } from './util/events';
-import { extname, join } from 'path';
+import { join } from 'path';
 import { fillConfigDefaults, generateContext, getUserConfigFile, replacePathVars } from './util/config';
 import { Logger } from './logger/logger';
 import * as webpackApi from 'webpack';
@@ -47,26 +47,11 @@ export function webpack(context: BuildContext, configFile: string) {
 
 export function webpackUpdate(event: string, path: string, context: BuildContext, configFile: string) {
   const logger = new Logger('webpack update');
-  const extension = extname(path);
-
   const webpackConfig = getWebpackConfig(context, configFile);
-  return Promise.resolve().then(() => {
-    if (extension === '.ts') {
-      Logger.debug('webpackUpdate: Typescript File Changed');
-      return typescriptFileChanged(path, context.fileCache);
-    } else {
-      Logger.debug('webpackUpdate: Non-Typescript File Changed');
-      return otherFileChanged(path).then((file: File) => {
-        return [file];
-      });
-    }
-  })
-    .then((files: File[]) => {
-      Logger.debug('webpackUpdate: Starting Incremental Build');
-      const promisetoReturn = runWebpackIncrementalBuild(false, context, webpackConfig);
-      emit(EventType.WebpackFilesChanged, [path]);
-      return promisetoReturn;
-    }).then((stats: any) => {
+  Logger.debug('webpackUpdate: Starting Incremental Build');
+  const promisetoReturn = runWebpackIncrementalBuild(false, context, webpackConfig);
+  emit(EventType.WebpackFilesChanged, [path]);
+  return promisetoReturn.then((stats: any) => {
       // the webpack incremental build finished, so reset the list of pending promises
       pendingPromises = [];
       Logger.debug('webpackUpdate: Incremental Build Done, processing Data');

src/webpack/watch-memory-system.ts

@@ -1,11 +1,13 @@
 import { FileCache } from '../util/file-cache';
 import { on, EventType } from '../util/events';
+import { Logger } from '../logger/logger';
 
 export class WatchMemorySystem {
 
   private changes: Set<string>;
   private isAggregating: boolean;
   private isListening: boolean;
+  private lastWatchEventTimestamp: number = Date.now();
 
   private filePathsBeingWatched: string[];
   private dirPaths: string[];
@@ -48,31 +50,23 @@ export class WatchMemorySystem {
 
   startListening() {
     this.isListening = true;
-    on(EventType.WebpackFilesChanged, ((filePaths: string[]) => {
+    on(EventType.WebpackFilesChanged, () => {
       this.changes = new Set<string>();
+      const filePaths = this.fileCache.getAll().filter(file => file.timestamp >= this.lastWatchEventTimestamp).map(file => file.path);
+      Logger.debug('filePaths: ', filePaths);
+      this.lastWatchEventTimestamp = Date.now();
       this.processChanges(filePaths);
-    }));
+    });
   }
 
   processChanges(filePaths: string[]) {
     this.immediateCallback(filePaths[0], Date.now());
     for ( const path of filePaths) {
       this.changes.add(path);
     }
+    // don't bother waiting around, just call doneAggregating right away.
+    // keep it as a function in case we need to wait via setTimeout a bit in the future
     this.doneAggregating(this.changes);
-    /*if (this.isAggregating) {
-      // we're currently aggregating file changes into a collection
-      this.changes.add(filePath);
-    } else {
-      // we're starting a new listen, so start a new list of files, and start aggregating the files
-      this.changes = new Set<string>();
-      this.changes.add(filePath);
-      this.isAggregating = true;
-      setTimeout(() => {
-        // we're done aggregating files
-        this.doneAggregating(this.changes);
-      }, AGGREGATING_DURATION_IN_MILLIS);
-    }*/
   }
 
   doneAggregating(changes: Set<string>) {