fix(seed): reset seed on each emit (#140)

* fix(seed): reset seed on each emit

* test: webpack@4 is returning different result

Author: mastilver

lib/plugin.js

@@ -33,7 +33,6 @@ ManifestPlugin.prototype.getFileType = function(str) {
 };
 
 ManifestPlugin.prototype.apply = function(compiler) {
-  var seed = this.opts.seed || {};
   var moduleAssets = {};
 
   var outputFolder = compiler.options.output.path;
@@ -51,6 +50,8 @@ ManifestPlugin.prototype.apply = function(compiler) {
     const emitCount = emitCountMap.get(outputName) - 1
     emitCountMap.set(outputName, emitCount);
 
+    var seed = this.opts.seed || {};
+
     var publicPath = this.opts.publicPath != null ? this.opts.publicPath : compilation.options.output.publicPath;
     var stats = compilation.getStats().toJson();
 

spec/plugin.integration.spec.js

@@ -142,15 +142,20 @@ describe('ManifestPlugin using real fs', function() {
   });
 
   describe('watch mode', function() {
+    var compiler;
     var hashes;
 
     beforeAll(function () {
       fse.outputFileSync(path.join(__dirname, 'output/watch-mode/index.js'), 'console.log(\'v1\')');
       hashes = [];
     });
 
+    afterAll(() => {
+      compiler.close()
+    })
+
     it('outputs a manifest of one file', function(done) {
-      const compiler = webpackCompile({
+      compiler = webpackCompile({
         context: __dirname,
         output: {
           filename: '[name].[hash].js',
@@ -174,7 +179,6 @@ describe('ManifestPlugin using real fs', function() {
 
         if (hashes.length === 2) {
           expect(hashes[0]).not.toEqual(hashes[1]);
-          compiler.close()
           return done();
         }
 
@@ -183,6 +187,63 @@ describe('ManifestPlugin using real fs', function() {
     });
   });
 
+  describe('import() update', () => {
+    let compiler;
+    let isFirstRun;
+
+    beforeAll(() => {
+      fse.outputFileSync(path.join(__dirname, 'output/watch-import-chunk/chunk1.js'), 'console.log(\'chunk 1\')');
+      fse.outputFileSync(path.join(__dirname, 'output/watch-import-chunk/chunk2.js'), 'console.log(\'chunk 2\')');
+      fse.outputFileSync(path.join(__dirname, 'output/watch-import-chunk/index.js'), 'import(\'./chunk1\')\nimport(\'./chunk2\')');
+      isFirstRun = true;
+    });
+
+    afterAll(() => {
+      compiler.close()
+    })
+
+    it('outputs a manifest of one file', function(done) {
+      compiler = webpackCompile({
+        context: __dirname,
+        output: {
+          filename: '[name].js',
+          path: path.join(__dirname, 'output/watch-import-chunk')
+        },
+        entry: './output/watch-import-chunk/index.js',
+        watch: true,
+        plugins: [
+          new ManifestPlugin(),
+          new webpack.HotModuleReplacementPlugin()
+        ]
+      }, {}, function(stats) {
+        var manifest = JSON.parse(fse.readFileSync(path.join(__dirname, 'output/watch-import-chunk/manifest.json')))
+
+        expect(manifest).toBeDefined();
+
+        if (isFirstRun) {
+          expect(manifest).toEqual({
+            'main.js': 'main.js',
+            '0.js': '0.js',
+            '1.js': '1.js'
+          });
+
+          isFirstRun = false;
+          fse.outputFileSync(path.join(__dirname, 'output/watch-import-chunk/index.js'), 'import(\'./chunk1\')');
+        } else {
+          expect(manifest).toEqual(isWebpack4({
+            'main.js': 'main.js',
+            '1.js': '1.js',
+          }, {
+            'main.js': 'main.js',
+            '3.js': '3.js',
+          }));
+
+          done();
+        }
+      });
+    });
+  });
+
   describe('multiple compilation', function() {
     var nbCompiler = 10;
     var originalTimeout;