fix: cache invalidation

Author: evilebottnawi

package-lock.json

@@ -66,12 +66,12 @@
     "file-loader": "^6.1.0",
     "husky": "^4.3.0",
     "jest": "^26.4.2",
-    "lint-staged": "^10.3.0",
+    "lint-staged": "^10.4.0",
     "memfs": "^3.2.0",
     "npm-run-all": "^4.1.5",
     "prettier": "^2.1.2",
     "standard-version": "^9.0.0",
-    "webpack": "^4.44.1"
+    "webpack": "^4.44.2"
   },
   "keywords": [
     "webpack"

package.json

@@ -11,6 +11,7 @@ import webpack, {
   version as webpackVersion,
 } from 'webpack';
 import validateOptions from 'schema-utils';
+import serialize from 'serialize-javascript';
 
 import schema from './options.json';
 
@@ -52,7 +53,6 @@ class CompressionPlugin {
     };
 
     this.algorithm = this.options.algorithm;
-    this.compressionOptions = this.options.compressionOptions;
 
     if (typeof this.algorithm === 'string') {
       // eslint-disable-next-line global-require
@@ -66,9 +66,9 @@ class CompressionPlugin {
         );
       }
 
-      this.compressionOptions = {
+      this.options.compressionOptions = {
         ...{ level: 9 },
-        ...this.compressionOptions,
+        ...this.options.compressionOptions,
       };
     }
   }
@@ -117,20 +117,22 @@ class CompressionPlugin {
 
   runCompressionAlgorithm(input) {
     return new Promise((resolve, reject) => {
-      const { algorithm, compressionOptions } = this;
+      this.algorithm(
+        input,
+        this.options.compressionOptions,
+        (error, result) => {
+          if (error) {
+            return reject(error);
+          }
 
-      algorithm(input, compressionOptions, (error, result) => {
-        if (error) {
-          return reject(error);
-        }
+          if (!Buffer.isBuffer(result)) {
+            // eslint-disable-next-line no-param-reassign
+            result = Buffer.from(result);
+          }
 
-        if (!Buffer.isBuffer(result)) {
-          // eslint-disable-next-line no-param-reassign
-          result = Buffer.from(result);
+          return resolve(result);
         }
-
-        return resolve(result);
-      });
+      );
     });
   }
 
@@ -204,12 +206,16 @@ class CompressionPlugin {
               'compression-webpack-plugin': require('../package.json').version,
               algorithm: this.algorithm,
               originalAlgorithm: this.options.algorithm,
-              compressionOptions: this.compressionOptions,
+              compressionOptions: this.options.compressionOptions,
               name,
               contentHash: crypto.createHash('md4').update(input).digest('hex'),
             };
           } else {
-            cacheData.name = name;
+            cacheData.name = serialize({
+              name,
+              algorithm: this.options.algorithm,
+              compressionOptions: this.options.compressionOptions,
+            });
           }
 
           let output = await cache.get(cacheData, { RawSource });
@@ -282,7 +288,7 @@ class CompressionPlugin {
             // TODO `...` required only for webpack@4
             const newOriginalInfo = {
               ...info,
-              related: { [relatedName]: newName },
+              related: { [relatedName]: newName, ...info.related },
             };
 
             CompressionPlugin.updateAsset(