Fix output when using "--json" or "-j" option

bin/encore.js

@@ -45,8 +45,10 @@ if (runtimeConfig.useDevServer) {
 
     return require('webpack-dev-server/bin/webpack-dev-server');
 } else {
-    console.log('Running webpack ...');
-    console.log();
+    if (!runtimeConfig.outputJson) {
+        console.log('Running webpack ...');
+        console.log();
+    }
 
     return require('webpack/bin/webpack');
 }

lib/config-generator.js

@@ -243,13 +243,15 @@ class ConfigGenerator {
 
         notifierPluginUtil(plugins, this.webpackConfig);
 
-        const friendlyErrorPlugin = friendlyErrorPluginUtil(this.webpackConfig);
-        plugins.push({
-            plugin: friendlyErrorPlugin,
-            priority: PluginPriorities.FriendlyErrorsWebpackPlugin
-        });
+        if (!this.webpackConfig.runtimeConfig.outputJson) {
+            const friendlyErrorPlugin = friendlyErrorPluginUtil(this.webpackConfig);
+            plugins.push({
+                plugin: friendlyErrorPlugin,
+                priority: PluginPriorities.FriendlyErrorsWebpackPlugin
+            });
 
-        assetOutputDisplay(plugins, this.webpackConfig, friendlyErrorPlugin);
+            assetOutputDisplay(plugins, this.webpackConfig, friendlyErrorPlugin);
+        }
 
         this.webpackConfig.plugins.forEach(function(plugin) {
             plugins.push(plugin);
@@ -274,22 +276,28 @@ class ConfigGenerator {
     buildStatsConfig() {
         // try to silence as much as possible: the output is rarely helpful
         // this still doesn't remove all output
-        return {
-            hash: false,
-            version: false,
-            timings: false,
-            assets: false,
-            chunks: false,
-            maxModules: 0,
-            modules: false,
-            reasons: false,
-            children: false,
-            source: false,
-            errors: false,
-            errorDetails: false,
-            warnings: false,
-            publicPath: false,
-        };
+        let stats = {};
+
+        if (!this.webpackConfig.runtimeConfig.outputJson) {
+            stats = {
+                hash: false,
+                version: false,
+                timings: false,
+                assets: false,
+                chunks: false,
+                maxModules: 0,
+                modules: false,
+                reasons: false,
+                children: false,
+                source: false,
+                errors: false,
+                errorDetails: false,
+                warnings: false,
+                publicPath: false,
+            };
+        }
+
+        return stats;
     }
 
     buildDevServerConfig() {

lib/config/parse-runtime.js

@@ -24,6 +24,7 @@ module.exports = function(argv, cwd) {
     runtimeConfig.command = argv._[0];
     runtimeConfig.useDevServer = false;
     runtimeConfig.useHotModuleReplacement = false;
+    runtimeConfig.outputJson = false;
 
     switch (runtimeConfig.command) {
         case 'dev':
@@ -68,6 +69,10 @@ module.exports = function(argv, cwd) {
         runtimeConfig.helpRequested = true;
     }
 
+    if (argv.j || argv.json) {
+        runtimeConfig.outputJson = true;
+    }
+
     runtimeConfig.babelRcFileExists = (typeof resolveRc(require('fs'), runtimeConfig.context)) !== 'undefined';
 
     return runtimeConfig;

test/bin/encore.js

@@ -11,6 +11,7 @@
 
 const chai = require('chai');
 chai.use(require('chai-fs'));
+const expect = chai.expect;
 const path = require('path');
 const testSetup = require('../../lib/test/setup');
 const fs = require('fs-extra');
@@ -88,4 +89,38 @@ export default config;
             done();
         });
     });
+
+    it('Smoke test using the --json option', (done) => {
+        testSetup.emptyTmpDir();
+        const testDir = testSetup.createTestAppDir();
+
+        fs.writeFileSync(
+            path.join(testDir, 'webpack.config.js'),
+            `
+const Encore = require('../../index.js');
+Encore
+    .setOutputPath('build/')
+    .setPublicPath('/build')
+    .addEntry('main', './js/no_require')
+;
+
+module.exports = Encore.getWebpackConfig();
+            `
+        );
+
+        const binPath = path.resolve(__dirname, '../', '../', 'bin', 'encore.js');
+        exec(`node ${binPath} dev --json --context=${testDir}`, { cwd: testDir }, (err, stdout, stderr) => {
+            if (err) {
+                throw new Error(`Error executing encore: ${err} ${stderr} ${stdout}`);
+            }
+
+            const parsedOutput = JSON.parse(stdout);
+
+            expect(parsedOutput).to.be.an('object');
+            expect(parsedOutput.modules).to.be.an('array');
+            expect(parsedOutput.modules.length).to.equal(1);
+
+            done();
+        });
+    });
 });