feat: enable the parallel option by default (#131)

BREAKING CHANGE: the `parallel` option is `true` by default

Author: evilebottnawi

README.md

@@ -226,7 +226,7 @@ module.exports = {
 ### `parallel`
 
 Type: `Boolean|Number`
-Default: `false`
+Default: `true`
 
 Use multi-process parallel running to improve the build speed.
 Default number of concurrent runs: `os.cpus().length - 1`.

jest.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  testEnvironment: 'node',
+};

src/index.js

@@ -1,6 +1,3 @@
-/* eslint-disable
-  no-param-reassign
-*/
 import crypto from 'crypto';
 import path from 'path';
 
@@ -34,7 +31,7 @@ class TerserPlugin {
       sourceMap = false,
       cache = false,
       cacheKeys = (defaultCacheKeys) => defaultCacheKeys,
-      parallel = false,
+      parallel = true,
       include,
       exclude,
     } = options;
@@ -160,6 +157,7 @@ class TerserPlugin {
   apply(compiler) {
     const buildModuleFn = (moduleArg) => {
       // to get detailed location info about errors
+      // eslint-disable-next-line no-param-reassign
       moduleArg.useSourceMap = true;
     };
 
@@ -356,19 +354,22 @@ class TerserPlugin {
                   compilation.assets[commentsFile].add('\n');
                   compilation.assets[commentsFile].add(commentsSource);
                 } else {
+                  // eslint-disable-next-line no-param-reassign
                   compilation.assets[commentsFile] = new ConcatSource(
                     compilation.assets[commentsFile],
                     '\n',
                     commentsSource
                   );
                 }
               } else {
+                // eslint-disable-next-line no-param-reassign
                 compilation.assets[commentsFile] = commentsSource;
               }
             }
           }
 
           // Updating assets
+          // eslint-disable-next-line no-param-reassign
           processedAssets.add((compilation.assets[file] = outputSource));
 
           // Handling warnings

src/minify.js

@@ -1,7 +1,4 @@
-/* eslint-disable
-  arrow-body-style
-*/
-import { minify as terserMinify } from 'terser';
+const { minify: terserMinify } = require('terser');
 
 const buildTerserOptions = ({
   ecma,
@@ -187,4 +184,4 @@ const minify = (options) => {
   return { error, map, code, warnings, extractedComments };
 };
 
-export default minify;
+module.exports = minify;

src/worker.js

@@ -1,4 +1,4 @@
-import minify from './minify';
+const minify = require('./minify');
 
 module.exports = (options, callback) => {
   try {

test/TerserPlugin.test.js

@@ -22,7 +22,7 @@ describe('TerserPlugin', () => {
     mappings: '',
   };
 
-  it('should works (without options)', async () => {
+  it('should work (without options)', async () => {
     const compiler = createCompiler();
 
     new TerserPlugin().apply(compiler);

test/__snapshots__/TerserPlugin.test.js.snap

@@ -82,12 +82,12 @@ exports[`TerserPlugin should regenerate hash: errors 1`] = `Array []`;
 
 exports[`TerserPlugin should regenerate hash: warnings 1`] = `Array []`;
 
-exports[`TerserPlugin should works (without options): assets 1`] = `
+exports[`TerserPlugin should work (without options): assets 1`] = `
 Object {
   "main.js": "!function(e){var t={};function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=e,n.c=t,n.d=function(e,t,r){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:r})},n.r=function(e){\\"undefined\\"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:\\"Module\\"}),Object.defineProperty(e,\\"__esModule\\",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&\\"object\\"==typeof e&&e&&e.__esModule)return e;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,\\"default\\",{enumerable:!0,value:e}),2&t&&\\"string\\"!=typeof e)for(var o in e)n.d(r,o,function(t){return e[t]}.bind(null,o));return r},n.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(t,\\"a\\",t),t},n.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},n.p=\\"\\",n(n.s=0)}([function(e,t){e.exports=function(){console.log(7)}}]);",
 }
 `;
 
-exports[`TerserPlugin should works (without options): errors 1`] = `Array []`;
+exports[`TerserPlugin should work (without options): errors 1`] = `Array []`;
 
-exports[`TerserPlugin should works (without options): warnings 1`] = `Array []`;
+exports[`TerserPlugin should work (without options): warnings 1`] = `Array []`;

test/__snapshots__/parallel-option.test.js.snap

@@ -38,3 +38,16 @@ Object {
 exports[`parallel option should match snapshot for the "true" value: errors 1`] = `Array []`;
 
 exports[`parallel option should match snapshot for the "true" value: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot when a value is not specify: assets 1`] = `
+Object {
+  "four.js": "!function(e){var t={};function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=e,n.c=t,n.d=function(e,t,r){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:r})},n.r=function(e){\\"undefined\\"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:\\"Module\\"}),Object.defineProperty(e,\\"__esModule\\",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&\\"object\\"==typeof e&&e&&e.__esModule)return e;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,\\"default\\",{enumerable:!0,value:e}),2&t&&\\"string\\"!=typeof e)for(var o in e)n.d(r,o,function(t){return e[t]}.bind(null,o));return r},n.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(t,\\"a\\",t),t},n.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},n.p=\\"\\",n(n.s=0)}([function(e,t){e.exports=function(){console.log(7)}}]);",
+  "one.js": "!function(e){var t={};function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=e,n.c=t,n.d=function(e,t,r){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:r})},n.r=function(e){\\"undefined\\"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:\\"Module\\"}),Object.defineProperty(e,\\"__esModule\\",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&\\"object\\"==typeof e&&e&&e.__esModule)return e;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,\\"default\\",{enumerable:!0,value:e}),2&t&&\\"string\\"!=typeof e)for(var o in e)n.d(r,o,function(t){return e[t]}.bind(null,o));return r},n.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(t,\\"a\\",t),t},n.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},n.p=\\"\\",n(n.s=0)}([function(e,t){e.exports=function(){console.log(7)}}]);",
+  "three.js": "!function(e){var t={};function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=e,n.c=t,n.d=function(e,t,r){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:r})},n.r=function(e){\\"undefined\\"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:\\"Module\\"}),Object.defineProperty(e,\\"__esModule\\",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&\\"object\\"==typeof e&&e&&e.__esModule)return e;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,\\"default\\",{enumerable:!0,value:e}),2&t&&\\"string\\"!=typeof e)for(var o in e)n.d(r,o,function(t){return e[t]}.bind(null,o));return r},n.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(t,\\"a\\",t),t},n.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},n.p=\\"\\",n(n.s=0)}([function(e,t){e.exports=function(){console.log(7)}}]);",
+  "two.js": "!function(e){var t={};function n(r){if(t[r])return t[r].exports;var o=t[r]={i:r,l:!1,exports:{}};return e[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=e,n.c=t,n.d=function(e,t,r){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:r})},n.r=function(e){\\"undefined\\"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:\\"Module\\"}),Object.defineProperty(e,\\"__esModule\\",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&\\"object\\"==typeof e&&e&&e.__esModule)return e;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,\\"default\\",{enumerable:!0,value:e}),2&t&&\\"string\\"!=typeof e)for(var o in e)n.d(r,o,function(t){return e[t]}.bind(null,o));return r},n.n=function(e){var t=e&&e.__esModule?function(){return e.default}:function(){return e};return n.d(t,\\"a\\",t),t},n.o=function(e,t){return Object.prototype.hasOwnProperty.call(e,t)},n.p=\\"\\",n(n.s=0)}([function(e,t){e.exports=function(){console.log(7)}}]);",
+}
+`;
+
+exports[`parallel option should match snapshot when a value is not specify: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot when a value is not specify: warnings 1`] = `Array []`;

test/parallel-option.test.js

@@ -27,7 +27,9 @@ jest.mock('worker-farm', () => {
         require(worker)(data, callback)
       ))
   );
+
   mock.end = jest.fn();
+
   return mock;
 });
 
@@ -49,6 +51,28 @@ describe('parallel option', () => {
     });
   });
 
+  it('should match snapshot when a value is not specify', async () => {
+    new TerserPlugin().apply(compiler);
+
+    const stats = await compile(compiler);
+
+    const errors = stats.compilation.errors.map(cleanErrorStack);
+    const warnings = stats.compilation.warnings.map(cleanErrorStack);
+
+    expect(workerFarm.mock.calls.length).toBe(1);
+    expect(workerFarm.mock.calls[0][0].maxConcurrentWorkers).toBe(
+      os.cpus().length - 1
+    );
+    expect(workerFarmMock.mock.calls.length).toBe(
+      Object.keys(stats.compilation.assets).length
+    );
+    expect(workerFarm.end.mock.calls.length).toBe(1);
+
+    expect(errors).toMatchSnapshot('errors');
+    expect(warnings).toMatchSnapshot('warnings');
+    expect(getAssets(stats, compiler)).toMatchSnapshot('assets');
+  });
+
   it('should match snapshot for the "false" value', async () => {
     new TerserPlugin({ parallel: false }).apply(compiler);
 

test/terserOptions-option.test.js

@@ -581,6 +581,7 @@ describe('terserOptions option', () => {
     const compiler = createCompiler();
 
     new TerserPlugin({
+      parallel: false,
       terserOptions: {
         output: {
           unknown: true,