Transpiling ES6 to ES5 on "prepublish" -> fixing Safari "const"

.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["es2015"]
+}

.gitignore

@@ -1 +1 @@
-node_modules
+node_modules

.npmignore

@@ -0,0 +1,3 @@
+.babelrc
+webpack.config.js
+/src/

index.js

@@ -1,45 +1 @@
-'use strict';
-const sliceAnsi = require('slice-ansi');
-const stringWidth = require('string-width');
-
-module.exports = (input, columns, opts) => {
-	opts = Object.assign({
-		position: 'end'
-	}, opts);
-
-	const position = opts.position;
-	const ellipsis = '…';
-
-	if (typeof input !== 'string') {
-		throw new TypeError(`Expected \`input\` to be a string, got ${typeof input}`);
-	}
-
-	if (typeof columns !== 'number') {
-		throw new TypeError(`Expected \`columns\` to be a number, got ${typeof columns}`);
-	}
-
-	if (columns < 1) {
-		return '';
-	}
-
-	if (columns === 1) {
-		return ellipsis;
-	}
-
-	const length = stringWidth(input);
-
-	if (length <= columns) {
-		return input;
-	}
-
-	if (position === 'start') {
-		return ellipsis + sliceAnsi(input, length - columns + 1, length);
-	} else if (position === 'middle') {
-		const half = Math.floor(columns / 2);
-		return sliceAnsi(input, 0, half) + ellipsis + sliceAnsi(input, length - (columns - half) + 1, length);
-	} else if (position === 'end') {
-		return sliceAnsi(input, 0, columns - 1) + ellipsis;
-	}
-
-	throw new Error(`Expected \`options.position\` to be either \`start\`, \`middle\` or \`end\`, got ${position}`);
-};
+module.exports = require("./lib/bundle.js");

package.json

@@ -13,7 +13,9 @@
     "node": ">=4"
   },
   "scripts": {
-    "test": "xo && ava"
+    "test": "xo && ava",
+    "build": "webpack --progress --colors --display-error-details --config webpack.config.js",
+    "prepublish": "npm run build"
   },
   "files": [
     "index.js"
@@ -37,6 +39,12 @@
   },
   "devDependencies": {
     "ava": "*",
+    "babel-core": "^6.24.1",
+    "babel-loader": "^7.0.0",
+    "babel-preset-es2015": "^6.24.1",
+    "uglify-es": "git://github.com/mishoo/UglifyJS2.git#harmony",
+    "uglifyjs-webpack-plugin": "^0.4.3",
+    "webpack": "^2.5.1",
     "xo": "*"
   }
 }

src/index.js

@@ -0,0 +1,45 @@
+'use strict';
+const sliceAnsi = require('slice-ansi');
+const stringWidth = require('string-width');
+
+module.exports = (input, columns, opts) => {
+  opts = Object.assign({
+    position: 'end'
+  }, opts);
+
+  const position = opts.position;
+  const ellipsis = '…';
+
+  if (typeof input !== 'string') {
+    throw new TypeError(`Expected \`input\` to be a string, got ${typeof input}`);
+  }
+
+  if (typeof columns !== 'number') {
+    throw new TypeError(`Expected \`columns\` to be a number, got ${typeof columns}`);
+  }
+
+  if (columns < 1) {
+    return '';
+  }
+
+  if (columns === 1) {
+    return ellipsis;
+  }
+
+  const length = stringWidth(input);
+
+  if (length <= columns) {
+    return input;
+  }
+
+  if (position === 'start') {
+    return ellipsis + sliceAnsi(input, length - columns + 1, length);
+  } else if (position === 'middle') {
+    const half = Math.floor(columns / 2);
+    return sliceAnsi(input, 0, half) + ellipsis + sliceAnsi(input, length - (columns - half) + 1, length);
+  } else if (position === 'end') {
+    return sliceAnsi(input, 0, columns - 1) + ellipsis;
+  }
+
+  throw new Error(`Expected \`options.position\` to be either \`start\`, \`middle\` or \`end\`, got ${position}`);
+};

webpack.config.js

@@ -0,0 +1,22 @@
+const path = require('path');
+const webpack = require('webpack');
+const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
+
+module.exports = {
+  entry: ['./src/index.js'],
+  output: {
+    path: path.join(__dirname, './lib'),
+    filename: 'bundle.js',
+  },
+  module: {
+    rules: [
+      {
+        test: /\.js$/,
+        use: ['babel-loader']
+      }
+    ]
+  },
+  plugins: [
+    new UglifyJSPlugin()
+  ],
+};