🐛 fix webpack assets conflict if output filenames end with .user.js

fix #90

Author: momocow

lib/plugin.ts

@@ -189,8 +189,10 @@ export class UserscriptPlugin
       ),
     );
 
-    for (const { originalFile } of context.fileInfo) {
-      compilation.deleteAsset(originalFile);
+    for (const { originalFile, userjsFile } of context.fileInfo) {
+      if (originalFile !== userjsFile) {
+        compilation.deleteAsset(originalFile);
+      }
     }
 
     await this.hooks.process.promise(compilation, context);
@@ -300,14 +302,24 @@ export class UserscriptPlugin
       ? await this.hooks.renderProxyHeaders.promise(proxyHeaders)
       : undefined;
 
-    compilation.emitAsset(
-      userjsFile,
-      new ConcatSource(headersStr, '\n', sourceAsset.source),
-      {
-        minimized: true,
-      },
-    );
-    chunk.files.add(userjsFile);
+    if (userjsFile !== originalFile) {
+      compilation.emitAsset(
+        userjsFile,
+        new ConcatSource(headersStr, '\n', sourceAsset.source),
+        {
+          minimized: true,
+        },
+      );
+      chunk.files.add(userjsFile);
+    } else {
+      compilation.updateAsset(
+        userjsFile,
+        new ConcatSource(headersStr, '\n', sourceAsset.source),
+        {
+          minimized: true,
+        },
+      );
+    }
 
     if (metajs !== false) {
       compilation.emitAsset(metajsFile, new RawSource(headersStr), {

test/integration/general/index.test.ts

@@ -40,4 +40,24 @@ describe('general', () => {
       '/dist/output.js': Fixtures.entryMinJs,
     });
   });
+
+  // eslint-disable-next-line max-len
+  it('should successfully compile even the file extension is .user.js', async () => {
+    input.renameSync('/entry.js', '/entry.user.js');
+
+    const output = await compile(input, {
+      ...Fixtures.webpackConfig,
+      entry: '/entry.user.js',
+      output: {
+        path: '/dist',
+        filename: 'output.user.js',
+      },
+      plugins: [new UserscriptPlugin()],
+    });
+
+    expect(output.toJSON()).toEqual({
+      '/dist/output.user.js': Fixtures.entryUserJs(Fixtures.headers),
+      '/dist/output.meta.js': Fixtures.headers,
+    });
+  });
 });