Review comments: Move targetList to common helper

Add provision to get cli args when src/cli.js is run separately

src/cli-flags-helper.js

@@ -0,0 +1,38 @@
+const targetList = new Set([
+  "acorn",
+  "babel",
+  "babylon",
+  "buble",
+  "chai",
+  "coffeescript",
+  "espree",
+  "esprima",
+  "jshint",
+  "lebab",
+  "prepack",
+  "prettier",
+  "source-map",
+  "typescript",
+  "uglify-es",
+  "uglify-js"
+]);
+
+function getOnlyFlag(argv) {
+  if (process.argv.indexOf("--only") != -1) {
+    return process.argv[process.argv.indexOf("--only") + 1];
+  }
+}
+
+module.exports = {
+  getTarget: function() {
+    let onlyArg = getOnlyFlag();
+    if (targetList.has(onlyArg)) {
+      return [onlyArg];
+    } else if (typeof ONLY != "undefined" && targetList.has(ONLY)) {
+      return [ONLY];
+    } else {
+      return [...targetList];
+    }
+  },
+  targetList: targetList
+};

src/suite.js

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 const Benchmark = require("benchmark");
+const getTarget = require("./cli-flags-helper").getTarget;
 
 // We need to run deterministically, so we set 'maxTime' to 0, which
 // disables the variable iteration count feature of benchmark.js,
@@ -14,34 +15,12 @@ const defaultOptions = {
   minSamples: 20
 };
 
-const targetList = [
-  "acorn",
-  "babel",
-  "babylon",
-  "buble",
-  "chai",
-  "coffeescript",
-  "espree",
-  "esprima",
-  "jshint",
-  "lebab",
-  "prepack",
-  "prettier",
-  "source-map",
-  "typescript",
-  "uglify-es",
-  "uglify-js"
-];
-
 const suite = new Benchmark.Suite();
-const targetItems = ONLY ? [ONLY] : null;
-
-const requireList = (targetItems || targetList).map(val => {
-  return require(`./${val}-benchmark`);
-});
 
-requireList.forEach(options => {
-  suite.add(Object.assign({}, options, defaultOptions));
+getTarget().forEach(target => {
+  suite.add(
+    Object.assign({}, require(`./${target}-benchmark`), defaultOptions)
+  );
 });
 
 module.exports = suite;

webpack.config.js

@@ -6,34 +6,10 @@ const CopyWebpackPlugin = require("copy-webpack-plugin");
 const HtmlWebpackPlugin = require("html-webpack-plugin");
 const path = require("path");
 const webpack = require("webpack");
-
-const targetList = [
-  "acorn",
-  "babel",
-  "babylon",
-  "buble",
-  "chai",
-  "coffeescript",
-  "espree",
-  "esprima",
-  "jshint",
-  "lebab",
-  "prepack",
-  "prettier",
-  "source-map",
-  "typescript",
-  "uglify-es",
-  "uglify-js"
-];
+const targetList = require("./src/cli-flags-helper").targetList;
 
 function getTarget(env) {
-  return (
-    env &&
-    env.only &&
-    targetList.find(elem => {
-      return elem == env.only;
-    })
-  );
+  return env && targetList.has(env.only) && env.only;
 }
 
 module.exports = env => [