fix: support webpack@5 (#146)

Author: evilebottnawi

.editorconfig

@@ -9,5 +9,4 @@ insert_final_newline = true
 trim_trailing_whitespace = true
 
 [*.md]
-insert_final_newline = true
 trim_trailing_whitespace = false

.github/CONTRIBUTING.md

@@ -147,6 +147,14 @@ module. Thankfully, Github provides a means to do this. Add a dependency to the
 
 Where `{id}` is the # ID of your Pull Request.
 
+## Contributor License Agreement
+
+When submitting your contribution, a CLA (Contributor License Agreement) bot will come by to verify that you signed the [CLA](https://cla.js.foundation/webpack-contrib/compression-webpack-plugin).
+If it is your first time, it will link you to the right place to sign it.
+However, if you have committed your contributions using an email that is not the same as your email used on GitHub, the CLA bot can't accept your contribution.
+
+Run `git config user.email` to see your Git email, and verify it with [your GitHub email](https://github.com/settings/emails).
+
 ## Thanks
 
 For your interest, time, understanding, and for following this simple guide.

azure-pipelines.yml

@@ -2,10 +2,13 @@ trigger:
   - master
   - next
 
+variables:
+  npm_config_cache: $(Pipeline.Workspace)/.npm
+
 jobs:
   - job: Lint
     pool:
-      vmImage: ubuntu-16.04
+      vmImage: ubuntu-latest
     steps:
       - task: NodeTool@0
         inputs:
@@ -20,10 +23,12 @@ jobs:
           node -v
           npm -v
         displayName: 'Print versions'
-      - task: Npm@1
+      - task: CacheBeta@1
         inputs:
-          command: custom
-          customCommand: ci
+          key: npm | $(Agent.OS) | package-lock.json
+          path: $(npm_config_cache)
+        displayName: 'Cache npm'
+      - script: npm ci
         displayName: 'Install dependencies'
       - script: npm run lint
         displayName: 'Run lint'
@@ -34,10 +39,13 @@ jobs:
 
   - job: Linux
     pool:
-      vmImage: ubuntu-16.04
+      vmImage: ubuntu-latest
     strategy:
-      maxParallel: 4
+      maxParallel: 5
       matrix:
+        node-13:
+          node_version: ^13.0.0
+          webpack_version: latest
         node-12:
           node_version: ^12.0.0
           webpack_version: latest
@@ -47,10 +55,9 @@ jobs:
         node-8:
           node_version: ^8.9.0
           webpack_version: latest
-        node-8-canary:
-          node_version: ^8.9.0
+        node-10-canary:
+          node_version: ^10.13.0
           webpack_version: next
-          continue_on_error: true
     steps:
       - task: NodeTool@0
         inputs:
@@ -65,10 +72,12 @@ jobs:
           node -v
           npm -v
         displayName: 'Print versions'
-      - task: Npm@1
+      - task: CacheBeta@1
         inputs:
-          command: custom
-          customCommand: ci
+          key: npm | $(Agent.OS) | package-lock.json
+          path: $(npm_config_cache)
+        displayName: 'Cache npm'
+      - script: npm ci
         displayName: 'Install dependencies'
       - script: npm i webpack@$(webpack_version)
         displayName: 'Install "webpack@$(webpack_version)"'
@@ -86,10 +95,13 @@ jobs:
 
   - job: macOS
     pool:
-      vmImage: macOS-10.14
+      vmImage: macOS-latest
     strategy:
-      maxParallel: 4
+      maxParallel: 5
       matrix:
+        node-13:
+          node_version: ^13.0.0
+          webpack_version: latest
         node-12:
           node_version: ^12.0.0
           webpack_version: latest
@@ -99,10 +111,9 @@ jobs:
         node-8:
           node_version: ^8.9.0
           webpack_version: latest
-        node-8-canary:
-          node_version: ^8.9.0
+        node-10-canary:
+          node_version: ^10.13.0
           webpack_version: next
-          continue_on_error: true
     steps:
       - task: NodeTool@0
         inputs:
@@ -117,10 +128,12 @@ jobs:
           node -v
           npm -v
         displayName: 'Print versions'
-      - task: Npm@1
+      - task: CacheBeta@1
         inputs:
-          command: custom
-          customCommand: ci
+          key: npm | $(Agent.OS) | package-lock.json
+          path: $(npm_config_cache)
+        displayName: 'Cache npm'
+      - script: npm ci
         displayName: 'Install dependencies'
       - script: npm i webpack@$(webpack_version)
         displayName: 'Install "webpack@$(webpack_version)"'
@@ -138,10 +151,13 @@ jobs:
 
   - job: Windows
     pool:
-      vmImage: windows-2019
+      vmImage: windows-latest
     strategy:
-      maxParallel: 4
+      maxParallel: 5
       matrix:
+        node-13:
+          node_version: ^13.0.0
+          webpack_version: latest
         node-12:
           node_version: ^12.0.0
           webpack_version: latest
@@ -151,10 +167,9 @@ jobs:
         node-8:
           node_version: ^8.9.0
           webpack_version: latest
-        node-8-canary:
-          node_version: ^8.9.0
+        node-10-canary:
+          node_version: ^10.13.0
           webpack_version: next
-          continue_on_error: true
     steps:
       - script: 'git config --global core.autocrlf input'
         displayName: 'Config git core.autocrlf'
@@ -172,10 +187,12 @@ jobs:
           node -v
           npm -v
         displayName: 'Print versions'
-      - task: Npm@1
+      - task: CacheBeta@1
         inputs:
-          command: custom
-          customCommand: ci
+          key: npm | $(Agent.OS) | package-lock.json
+          path: $(npm_config_cache)
+        displayName: 'Cache npm'
+      - script: npm ci
         displayName: 'Install dependencies'
       - script: npm i webpack@$(webpack_version)
         displayName: 'Install "webpack@$(webpack_version)"'

jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  testEnvironment: 'node',
+  snapshotResolver: './test/helpers/snapshotResolver.js',
+};

package-lock.json

@@ -7,34 +7,38 @@
   "author": "Tobias Koppers @sokra",
   "homepage": "https://github.com/webpack-contrib/compression-webpack-plugin",
   "bugs": "https://github.com/webpack-contrib/compression-webpack-plugin/issues",
+  "funding": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/webpack"
+  },
   "main": "dist/cjs.js",
   "engines": {
     "node": ">= 8.9.0"
   },
   "scripts": {
     "start": "npm run build -- -w",
-    "prebuild": "npm run clean",
-    "build": "cross-env NODE_ENV=production babel src -d dist --ignore \"src/**/*.test.js\" --copy-files",
     "clean": "del-cli dist",
+    "prebuild": "npm run clean",
+    "build": "cross-env NODE_ENV=production babel src -d dist --copy-files",
     "commitlint": "commitlint --from=master",
-    "lint:prettier": "prettier \"{**/*,*}.{js,json,md,yml,css}\" --list-different",
-    "lint:js": "eslint --cache src test",
-    "lint": "npm-run-all -l -p \"lint:**\"",
-    "prepare": "npm run build",
-    "release": "standard-version",
     "security": "npm audit",
+    "lint:prettier": "prettier \"{**/*,*}.{js,json,md,yml,css,ts}\" --list-different",
+    "lint:js": "eslint --cache .",
+    "lint": "npm-run-all -l -p \"lint:**\"",
     "test:only": "cross-env NODE_ENV=test jest",
-    "test:watch": "cross-env NODE_ENV=test jest --watch",
-    "test:coverage": "cross-env NODE_ENV=test jest --collectCoverageFrom=\"src/**/*.js\" --coverage",
+    "test:watch": "npm run test:only -- --watch",
+    "test:coverage": "npm run test:only -- --collectCoverageFrom=\"src/**/*.js\" --coverage",
     "pretest": "npm run lint",
-    "test": "cross-env NODE_ENV=test npm run test:coverage",
+    "test": "npm run test:coverage",
+    "prepare": "npm run build",
+    "release": "standard-version",
     "defaults": "webpack-defaults"
   },
   "files": [
     "dist"
   ],
   "peerDependencies": {
-    "webpack": "^4.3.0"
+    "webpack": "^4.3.0 || ^5.0.0"
   },
   "dependencies": {
     "cacache": "^13.0.1",
@@ -51,7 +55,7 @@
     "@commitlint/cli": "^8.2.0",
     "@commitlint/config-conventional": "^8.2.0",
     "@gfx/zopfli": "^1.0.8",
-    "@webpack-contrib/defaults": "^5.0.0",
+    "@webpack-contrib/defaults": "^6.3.0",
     "@webpack-contrib/eslint-config-webpack": "^3.0.0",
     "babel-jest": "^24.9.0",
     "commitlint-azure-pipelines-cli": "^1.0.2",
@@ -66,7 +70,7 @@
     "jest": "^24.9.0",
     "jest-junit": "^10.0.0",
     "lint-staged": "^9.5.0",
-    "memory-fs": "^0.5.0",
+    "memfs": "^3.0.3",
     "npm-run-all": "^4.1.5",
     "prettier": "^1.19.1",
     "standard-version": "^7.0.1",

package.json

@@ -22,7 +22,10 @@ import schema from './options.json';
 
 class CompressionPlugin {
   constructor(options = {}) {
-    validateOptions(schema, options, 'Compression Plugin');
+    validateOptions(schema, options, {
+      name: 'Compression Plugin',
+      baseDataPath: 'options',
+    });
 
     const {
       test,