Update Webpack plugin

Author: Mrtenz

packages/snaps-webpack-plugin/src/__snapshots__/plugin.test.ts.snap

@@ -2,15 +2,13 @@
 
 exports[`SnapsWebpackPlugin applies a transform 1`] = `
 "(() => {
-  var __webpack_exports__ = {};
   const foo = 'bar';
 })();"
 `;
 
 exports[`SnapsWebpackPlugin forwards the options 1`] = `
 "/******/(() => {
   // webpackBootstrap
-  var __webpack_exports__ = {};
 
   // foo bar
   /* baz qux */

packages/snaps-webpack-plugin/src/plugin.test.ts

@@ -61,8 +61,8 @@ const bundle = async ({
     ...webpackOptions,
   });
 
-  bundler.inputFileSystem = fileSystem;
-  bundler.outputFileSystem = fileSystem;
+  bundler.inputFileSystem = fileSystem as unknown as webpack.InputFileSystem;
+  bundler.outputFileSystem = fileSystem as unknown as webpack.OutputFileSystem;
 
   await fs.mkdir('/lib', { recursive: true });
   await fs.writeFile('/foo.js', code);

packages/snaps-webpack-plugin/src/plugin.ts

@@ -128,8 +128,11 @@ export default class SnapsWebpackPlugin {
 
       const filePath = pathUtils.join(outputPath, file.name);
 
+      const fs = compiler.outputFileSystem;
+      assert(fs, 'Expected compiler to have an output file system.');
+
       const bundleFile = await promisify(
-        compiler.outputFileSystem.readFile.bind(compiler.outputFileSystem),
+        fs.readFile.bind(compiler.outputFileSystem),
       )(filePath);
       assert(bundleFile);
 
@@ -148,11 +151,7 @@ export default class SnapsWebpackPlugin {
             updateAndWriteManifest: this.options.writeManifest,
             sourceCode: bundleContent,
             writeFileFn: async (path, data) => {
-              return writeManifest(
-                path,
-                data,
-                promisify(compiler.outputFileSystem.writeFile),
-              );
+              return writeManifest(path, data, promisify(fs.writeFile));
             },
           },
         );