fix: cache issue

packages/webpack-cli/lib/utils/Compiler.js

@@ -87,8 +87,15 @@ class Compiler {
         // eslint-disable-next-line  no-async-promise-executor
         return new Promise(async (resolve) => {
             await this.compiler.run((err, stats) => {
-                const content = this.compilerCallback(err, stats, lastHash, options, outputOptions);
-                resolve(content);
+                if (this.compiler.close) {
+                    this.compiler.close(() => {
+                        const content = this.compilerCallback(err, stats, lastHash, options, outputOptions);
+                        resolve(content);
+                    });
+                } else {
+                    const content = this.compilerCallback(err, stats, lastHash, options, outputOptions);
+                    resolve(content);
+                }
             });
         });
     }

scripts/cleanupTest.js

@@ -3,7 +3,18 @@ const rimraf = require('rimraf');
 const { join } = require('path');
 const collectTestFolders = require('./utils');
 
-const outputDirectories = ['bin', 'binary', 'dist', 'test', 'test-assets', 'test-plugin', 'test-loader', 'stats.json'];
+const outputDirectories = [
+    'bin',
+    'binary',
+    'dist',
+    'test',
+    'test-assets',
+    'test-plugin',
+    'test-loader',
+    'test-cache-path',
+    'test-locate-cache',
+    'stats.json',
+];
 
 function folderStrategy(stats, file) {
     return stats.isDirectory() && outputDirectories.includes(file);

test/cache/cache.test.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const { run, isWebpack5 } = require('../utils/test-utils');
+
+describe('cache related tests', () => {
+    it('should log warning in case of single compiler', () => {
+        let { stderr, stdout } = run(__dirname, ['-c', 'webpack.config.js'], false);
+        // run 2nd compilation
+        ({ stderr, stdout } = run(__dirname, ['-c', 'webpack.config.js'], false));
+
+        if (isWebpack5) {
+            expect(stderr).toContain('starting to restore cache content');
+            expect(stdout).toContain('[cached] 1 module');
+        }
+    });
+});

test/cache/src/main.js

@@ -0,0 +1 @@
+console.log('tehghgst cache');

test/cache/webpack.config.js

@@ -0,0 +1,24 @@
+const path = require('path');
+
+module.exports = {
+    cache: {
+        type: 'filesystem',
+        buildDependencies: {
+            config: [__filename],
+        },
+    },
+    infrastructureLogging: {
+        debug: /webpack\.cache/,
+    },
+    entry: {
+        app: './src/main.js',
+    },
+    devtool: 'inline-source-map',
+    plugins: [],
+    output: {
+        filename: '[name].bundle.js',
+        chunkFilename: '[name].bundle.js',
+        path: path.resolve(__dirname, 'dist'),
+        publicPath: '/',
+    },
+};

test/core-flags/cache-flags.test.js

@@ -1,6 +1,8 @@
 'use strict';
 
 const { run } = require('../utils/test-utils');
+const { existsSync } = require('fs');
+const { resolve } = require('path');
 
 describe('cache related flags from core', () => {
     it('should be successful with --cache ', () => {
@@ -25,17 +27,19 @@ describe('cache related flags from core', () => {
     });
 
     it('should set cache.cacheDirectory with --cache-cache-directory', () => {
-        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-cache-directory', '/test-cache-path']);
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-cache-directory', './test-cache-path']);
 
         expect(stderr).toBeFalsy();
         expect(stdout).toContain('test-cache-path');
+        expect(existsSync(resolve(__dirname, './test-cache-path'))).toBeTruthy();
     });
 
     it('should set cache.cacheLocation with --cache-cache-locations', () => {
-        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-cache-location', '/test-locate-cache']);
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-cache-location', './test-locate-cache']);
 
         expect(stderr).toBeFalsy();
         expect(stdout).toContain('test-locate-cache');
+        expect(existsSync(resolve(__dirname, './test-locate-cache'))).toBeTruthy();
     });
 
     it('should set cache.hashAlgorithm with --cache-hash-algorithm', () => {