[feature] --silent

bin/webpack.js

@@ -62,6 +62,10 @@
 	var BASIC_GROUP = "Basic options:";
 
 	yargs.options({
+		silent: {
+			type: "boolean",
+			describe: "Prevent output from being displayed in stdout"
+		},
 		json: {
 			type: "boolean",
 			alias: "j",
@@ -229,6 +233,14 @@
 			return;
 		}
 
+		/**
+		 * When --silent flag is present, an object with a no-op write method is
+		 * used in place of process.stout
+		 */
+		var stdout = argv.silent ? {
+			write: () => {}
+		} : process.stdout;
+
 		function ifArg(name, fn, init) {
 			if (Array.isArray(argv[name])) {
 				if (init) init();
@@ -423,13 +435,13 @@
 					process.exit(1); // eslint-disable-line
 				}
 				if (outputOptions.json) {
-					process.stdout.write(
+					stdout.write(
 						JSON.stringify(stats.toJson(outputOptions), null, 2) + "\n"
 					);
 				} else if (stats.hash !== lastHash) {
 					lastHash = stats.hash;
 					var statsString = stats.toString(outputOptions);
-					if (statsString) process.stdout.write(statsString + "\n");
+					if (statsString) stdout.write(statsString + "\n");
 				}
 				if (!options.watch && stats.hasErrors()) {
 					process.exitCode = 2;

test/binCases/silent/silent-output/index.js

@@ -0,0 +1 @@
+module.exports = "foo";

test/binCases/silent/silent-output/index2.js

@@ -0,0 +1 @@
+module.exports = "bar";

test/binCases/silent/silent-output/stdin.js

@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = function testAssertions(code, stdout, stderr) {
+	expect(code).toBe(0);
+	expect(stdout).toHaveLength(0);
+	expect(stderr).toHaveLength(0);
+};

test/binCases/silent/silent-output/test.opts

@@ -0,0 +1 @@
+--silent

test/binCases/silent/silent-output/webpack.config.js

@@ -0,0 +1,17 @@
+var path = require("path");
+
+module.exports = [
+	{
+		entry: path.resolve(__dirname, "./index"),
+		stats: "errors-only"
+	},
+	{
+		entry: path.resolve(__dirname, "./index2"),
+		stats: {
+			assets: true,
+			colors: true,
+			chunks: true,
+			maxModules: 0
+		}
+	}
+];