feat(webpack-cli): import flags from webpack core

jest.config.js

@@ -1,5 +1,10 @@
+const { cli } = require('webpack');
+
+//ignore core-flags test for webpack@4
+const ignorePattern = typeof cli !== 'undefined' ? ['<rootDir>/node_modules/'] : ['<rootDir>/node_modules/', '<rootDir>/test/core-flags'];
+
 module.exports = {
-    testPathIgnorePatterns: ['<rootDir>/node_modules/'],
+    testPathIgnorePatterns: ignorePattern,
     // transformIgnorePatterns: ['<rootDir>.*(node_modules)(?!.*webpack-cli.*).*$'],
     testEnvironment: 'node',
     collectCoverage: true,

packages/webpack-cli/lib/bootstrap.js

@@ -4,7 +4,6 @@ const logger = require('./utils/logger');
 const cliExecuter = require('./utils/cli-executer');
 const argParser = require('./utils/arg-parser');
 require('./utils/process-log');
-
 process.title = 'webpack-cli';
 
 const isCommandUsed = (commands) =>

packages/webpack-cli/lib/utils/arg-parser.js

@@ -99,7 +99,6 @@ function argParser(options, args, argsOnly = false, name = '', helpFunction = un
     const opts = result.opts();
 
     const unknownArgs = result.args;
-
     args.forEach((arg) => {
         const flagName = arg.slice(5);
         const option = options.find((opt) => opt.name === flagName);

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

@@ -1,3 +1,5 @@
+const { cli } = require('webpack');
+
 const HELP_GROUP = 'help';
 const CONFIG_GROUP = 'config';
 const BASIC_GROUP = 'basic';
@@ -6,6 +8,35 @@ const ADVANCED_GROUP = 'advanced';
 const DISPLAY_GROUP = 'stats';
 const ZERO_CONFIG_GROUP = 'zero-config';
 
+// Extract all the flages being exported from core. A list of cli flags generated by core
+// can be found here https://github.com/webpack/webpack/blob/master/test/__snapshots__/Cli.test.js.snap
+let flagsFromCore =
+    typeof cli !== 'undefined'
+        ? Object.entries(cli.getArguments()).map(([flag, meta]) => {
+              if (meta.simpleType === 'string') {
+                  meta.type = String;
+                  meta.usage = `--${flag} <value>`;
+              } else if (meta.simpleType === 'number') {
+                  meta.type = Number;
+                  meta.usage = `--${flag} <value>`;
+              } else {
+                  meta.type = Boolean;
+                  meta.negative = true;
+                  meta.usage = `--${flag}`;
+              }
+              return {
+                  ...meta,
+                  name: flag,
+                  group: 'core',
+              };
+          })
+        : [];
+
+// duplicate flags
+const duplicateFlags = ['entry', 'mode', 'stats', 'watch', 'target'];
+
+flagsFromCore = flagsFromCore.filter((flag) => !duplicateFlags.includes(flag.name));
+
 module.exports = {
     groups: {
         HELP_GROUP,
@@ -227,6 +258,7 @@ module.exports = {
             group: CONFIG_GROUP,
             description: 'Environment passed to the configuration when it is a function',
         },
+        ...flagsFromCore,
         /* 		{
 			name: "analyze",
 			type: Boolean,
@@ -241,4 +273,5 @@ module.exports = {
 			group: BASIC_GROUP
 		} */
     ],
+    flagsFromCore: [...flagsFromCore],
 };

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

@@ -10,6 +10,7 @@ class WebpackCLI extends GroupHelper {
         super();
         this.groupMap = new Map();
         this.groups = [];
+        this.args = {};
         this.processingMessageBuffer = [];
         this.compilation = new Compiler();
         this.defaultEntry = 'index';
@@ -42,6 +43,26 @@ class WebpackCLI extends GroupHelper {
         }
     }
 
+    /**
+     * Responsible for handling flags coming from webpack/webpack
+     * @private\
+     * @returns {void}
+     */
+    _handleCoreFlags() {
+        if (!this.groupMap.has('core')) {
+            return;
+        }
+        const coreFlags = this.groupMap.get('core');
+
+        // convert all the flags from map to single object
+        const coreConfig = coreFlags.reduce((allFlag, curFlag) => ({ ...allFlag, ...curFlag }), {});
+
+        const coreCliHelper = require('webpack').cli;
+        const coreCliArgs = coreCliHelper.getArguments();
+        // Merge the core flag config with the compilerConfiguration
+        coreCliHelper.processArguments(coreCliArgs, this.compilerConfiguration, coreConfig);
+    }
+
     /**
      * Expose commander argParser
      * @param  {...any} args args for argParser
@@ -222,6 +243,7 @@ class WebpackCLI extends GroupHelper {
             .then(() => this._handleDefaultEntry())
             .then(() => this._handleGroupHelper(this.configGroup))
             .then(() => this._handleGroupHelper(this.outputGroup))
+            .then(() => this._handleCoreFlags())
             .then(() => this._handleGroupHelper(this.basicGroup))
             .then(() => this._handleGroupHelper(this.advancedGroup))
             .then(() => this._handleGroupHelper(this.statsGroup))

scripts/cleanupTest.js

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

test/core-flags/amd-flag.test.js

@@ -0,0 +1,12 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('--no-amd flag', () => {
+    it('should accept --no-amd', () => {
+        const { stderr, stdout } = run(__dirname, ['--no-amd']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('amd: false');
+    });
+});

test/core-flags/bail-flag.test.js

@@ -0,0 +1,19 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('--bail flag', () => {
+    it('should set bail to true', () => {
+        const { stderr, stdout } = run(__dirname, ['--bail']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('bail: true');
+    });
+
+    it('should set bail to false', () => {
+        const { stderr, stdout } = run(__dirname, ['--no-bail']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('bail: false');
+    });
+});

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

@@ -0,0 +1,82 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('cache related flags from core', () => {
+    it('should be successful with --cache ', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`type: 'memory'`);
+    });
+
+    it('should be successful with --no-cache ', () => {
+        const { stderr, stdout } = run(__dirname, ['--no-cache']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('cache: false');
+    });
+
+    it('should set cache.type', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`type: 'filesystem'`);
+    });
+
+    it('should set cache.cacheDirectory with --cache-cache-directory', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-cache-directory', '/test-cache-path']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('test-cache-path');
+    });
+
+    it('should set cache.cacheLocation with --cache-cache-locations', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-cache-location', '/test-locate-cache']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('test-locate-cache');
+    });
+
+    it('should set cache.hashAlgorithm with --cache-hash-algorithm', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-hash-algorithm', 'sha256']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`hashAlgorithm: 'sha256'`);
+    });
+
+    it('should set cache.managedPaths with --cache-managed-paths', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'memory', '--cache-managed-paths', '/test-manage-path']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('test-manage-path');
+    });
+
+    it('should reset cache.managedPaths with --cache-managed-paths-reset', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-managed-paths-reset']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`managedPaths: []`);
+    });
+
+    it('should set cache.name with --cache-name', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-name', 'cli-test']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`name: 'cli-test'`);
+    });
+
+    it('should set cache.store with --cache-store', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-store', 'pack']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`store: 'pack'`);
+    });
+
+    it('should set cache.version with --cache-version', () => {
+        const { stderr, stdout } = run(__dirname, ['--cache-type', 'filesystem', '--cache-version', '1.1.3']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`version: '1.1.3'`);
+    });
+});

test/core-flags/context-flag.test.js

@@ -0,0 +1,12 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('--context flag', () => {
+    it('should allow to set context', () => {
+        const { stderr, stdout } = run(__dirname, ['--context', '/test-context-path']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('test-context-path');
+    });
+});

test/core-flags/dependencies-flag.test.js

@@ -0,0 +1,19 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('--dependencies and related flags', () => {
+    it('should allow to set dependencies option', () => {
+        const { stderr, stdout } = run(__dirname, ['--dependencies', 'lodash']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`dependencies: [ 'lodash' ]`);
+    });
+
+    it('should reset dependencies option', () => {
+        const { stderr, stdout } = run(__dirname, ['--dependencies-reset']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('dependencies: []');
+    });
+});

test/core-flags/devtool-flag.test.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('--devtool flag', () => {
+    it('should set devtool option', () => {
+        const { stderr, stdout } = run(__dirname, ['--devtool', 'source-map']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`devtool: 'source-map'`);
+    });
+
+    it('should throw error for invalid config', () => {
+        const { stderr } = run(__dirname, ['--devtool', 'invalid']);
+
+        expect(stderr).toContain('ValidationError: Invalid configuration object');
+    });
+});

test/core-flags/experiments-flag.test.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const { run, hyphenToUpperCase } = require('../utils/test-utils');
+const { flagsFromCore } = require('../../packages/webpack-cli/lib/utils/cli-flags');
+
+const experimentsFlags = flagsFromCore.filter(({ name }) => name.startsWith('experiments-'));
+
+describe('experiments option related flag', () => {
+    experimentsFlags.forEach((flag) => {
+        // extract property name from flag name
+        const property = flag.name.split('experiments-')[1];
+        const propName = hyphenToUpperCase(property);
+
+        it(`should config ${flag.name} correctly`, () => {
+            const { stderr, stdout } = run(__dirname, [`--${flag.name}`]);
+            expect(stderr).toBeFalsy();
+            expect(stdout).toContain(`${propName}: true`);
+        });
+
+        it(`should config --no-${flag.name} correctly`, () => {
+            const { stderr, stdout } = run(__dirname, [`--no-${flag.name}`]);
+            expect(stderr).toBeFalsy();
+            expect(stdout).toContain(`${propName}: false`);
+        });
+    });
+});

test/core-flags/externals-flags.test.js

@@ -0,0 +1,33 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('externals related flag', () => {
+    it('should set externals properly', () => {
+        const { stderr, stdout } = run(__dirname, ['--externals', './main.js']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`externals: [ './main.js' ]`);
+    });
+
+    it('should set externalsType properly', () => {
+        const { stderr, stdout } = run(__dirname, ['--externals', 'var']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`externalsType: 'var'`);
+    });
+
+    it('should accept --external-type values', () => {
+        const { stderr, stdout } = run(__dirname, ['--externals-type', 'var']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`externalsType: 'var'`);
+    });
+
+    it('should reset externals', () => {
+        const { stderr, stdout } = run(__dirname, ['--externals-reset']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`externals: []`);
+    });
+});

test/core-flags/infrastructure-logging.test.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('externals related flag', () => {
+    it('should set infrastructureLogging.debug properly', () => {
+        const { stderr, stdout } = run(__dirname, ['--infrastructure-logging-debug', 'myPlugin']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`debug: [ 'myPlugin' ]`);
+    });
+
+    it('should reset infrastructureLogging.debug to []', () => {
+        const { stderr, stdout } = run(__dirname, ['--infrastructure-logging-debug-reset']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`debug: []`);
+    });
+
+    it('should set infrastructureLogging.level properly', () => {
+        const { stderr, stdout } = run(__dirname, ['--infrastructure-logging-level', 'log']);
+
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain(`level: 'log'`);
+    });
+});

test/core-flags/main.js

@@ -0,0 +1 @@
+console.log('core-flags tests');