Require Node.js 6

.travis.yml

@@ -2,4 +2,3 @@ language: node_js
 node_js:
   - '8'
   - '6'
-  - '4'

lib/prerequisite.js

@@ -32,7 +32,7 @@ module.exports = (input, pkg, opts) => {
 					.then(collaborators => {
 						const json = JSON.parse(collaborators);
 						const permissions = json[username];
-						if (!permissions || permissions.indexOf('write') === -1) {
+						if (!permissions || !permissions.includes('write')) {
 							throw new Error('You do not have write permissions required to publish this package.');
 						}
 					})

lib/publish.js

@@ -4,29 +4,28 @@ const listrInput = require('listr-input');
 const Observable = require('any-observable');
 const chalk = require('chalk');
 
-const npmPublish = opts => {
+const npmPublish = options => {
 	const args = ['publish'];
 
-	if (opts.tag) {
-		args.push('--tag', opts.tag);
+	if (options.tag) {
+		args.push('--tag', options.tag);
 	}
 
-	if (opts.otp) {
-		args.push('--otp', opts.otp);
+	if (options.otp) {
+		args.push('--otp', options.otp);
 	}
 
 	return execa('npm', args);
 };
 
 const handleError = (task, err, tag, message) => {
-	if (err.stderr.indexOf('one-time pass') !== -1) {
-		const title = task.title;
+	if (err.stderr.includes('one-time pass')) {
+		const {title} = task;
 		task.title = `${title} ${chalk.yellow('(waiting for input…)')}`;
 
 		return listrInput(message || 'Enter OTP:', {
 			done: otp => {
 				task.title = title;
-
 				return npmPublish({tag, otp});
 			}
 		}).catch(err => handleError(task, err, tag, 'OTP was incorrect, try again:'));

lib/ui.js

@@ -24,6 +24,7 @@ function prettyVersionDiff(oldVersion, inc) {
 			output.push(chalk.reset.dim(newVersion[i]));
 		}
 	}
+
 	return output.join(chalk.reset.dim('.'));
 }
 
@@ -38,7 +39,6 @@ function printCommitLog(repositoryUrl) {
 			const history = result.split('\n')
 				.map(commit => {
 					const commitParts = commit.match(/^(.+)\s([a-f\d]{7})$/);
-
 					const commitMessage = util.linkifyIssues(repositoryUrl, commitParts[1]);
 					const commitId = util.linkifyCommit(repositoryUrl, commitParts[2]);
 

lib/util.js

@@ -4,7 +4,7 @@ const issueRegex = require('issue-regex');
 const terminalLink = require('terminal-link');
 
 exports.readPkg = () => {
-	const pkg = readPkgUp.sync().pkg;
+	const {pkg} = readPkgUp.sync();
 
 	if (!pkg) {
 		throw new Error(`No package.json found. Make sure you're in the correct project.`);

lib/version.js

@@ -6,16 +6,16 @@ exports.PRERELEASE_VERSIONS = ['prepatch', 'preminor', 'premajor', 'prerelease']
 
 const isValidVersion = input => Boolean(semver.valid(input));
 
-exports.isValidVersionInput = input => exports.SEMVER_INCREMENTS.indexOf(input) !== -1 || isValidVersion(input);
+exports.isValidVersionInput = input => exports.SEMVER_INCREMENTS.includes(input) || isValidVersion(input);
 
-exports.isPrereleaseVersion = version => exports.PRERELEASE_VERSIONS.indexOf(version) !== -1 || Boolean(semver.prerelease(version));
+exports.isPrereleaseVersion = version => exports.PRERELEASE_VERSIONS.includes(version) || Boolean(semver.prerelease(version));
 
 exports.getNewVersion = (oldVersion, input) => {
 	if (!exports.isValidVersionInput(input)) {
 		throw new Error(`Version should be either ${exports.SEMVER_INCREMENTS.join(', ')} or a valid semver version.`);
 	}
 
-	return exports.SEMVER_INCREMENTS.indexOf(input) === -1 ? input : semver.inc(oldVersion, input);
+	return exports.SEMVER_INCREMENTS.includes(input) ? semver.inc(oldVersion, input) : input;
 };
 
 exports.isVersionGreater = (oldVersion, newVersion) => {

package.json

@@ -1,56 +1,56 @@
 {
-  "name": "np",
-  "version": "2.20.1",
-  "description": "A better `npm publish`",
-  "license": "MIT",
-  "repository": "sindresorhus/np",
-  "bin": "cli.js",
-  "engines": {
-    "node": ">=4"
-  },
-  "scripts": {
-    "test": "xo && FORCE_HYPERLINK=1 ava"
-  },
-  "files": [
-    "index.js",
-    "cli.js",
-    "lib"
-  ],
-  "keywords": [
-    "cli-app",
-    "cli",
-    "npm",
-    "publish",
-    "git",
-    "push",
-    "version",
-    "bump",
-    "commit"
-  ],
-  "dependencies": {
-    "any-observable": "^0.2.0",
-    "chalk": "^2.3.0",
-    "del": "^3.0.0",
-    "execa": "^0.8.0",
-    "github-url-from-git": "^1.5.0",
-    "has-yarn": "^1.0.0",
-    "inquirer": "^3.0.6",
-    "issue-regex": "^1.0.0",
-    "listr": "^0.12.0",
-    "listr-input": "^0.1.1",
-    "log-symbols": "^2.1.0",
-    "meow": "^4.0.0",
-    "p-timeout": "^2.0.1",
-    "read-pkg-up": "^3.0.0",
-    "rxjs": "5.4.3",
-    "semver": "^5.2.0",
-    "split": "^1.0.0",
-    "stream-to-observable": "^0.2.0",
-    "terminal-link": "^1.1.0",
-    "update-notifier": "^2.1.0"
-  },
-  "devDependencies": {
-    "ava": "*",
-    "xo": "*"
-  }
+	"name": "np",
+	"version": "2.20.1",
+	"description": "A better `npm publish`",
+	"license": "MIT",
+	"repository": "sindresorhus/np",
+	"bin": "cli.js",
+	"engines": {
+		"node": ">=6"
+	},
+	"scripts": {
+		"test": "xo && FORCE_HYPERLINK=1 ava"
+	},
+	"files": [
+		"index.js",
+		"cli.js",
+		"lib"
+	],
+	"keywords": [
+		"cli-app",
+		"cli",
+		"npm",
+		"publish",
+		"git",
+		"push",
+		"version",
+		"bump",
+		"commit"
+	],
+	"dependencies": {
+		"any-observable": "^0.2.0",
+		"chalk": "^2.3.0",
+		"del": "^3.0.0",
+		"execa": "^0.10.0",
+		"github-url-from-git": "^1.5.0",
+		"has-yarn": "^1.0.0",
+		"inquirer": "^3.0.6",
+		"issue-regex": "^1.0.0",
+		"listr": "^0.12.0",
+		"listr-input": "^0.1.1",
+		"log-symbols": "^2.1.0",
+		"meow": "^5.0.0",
+		"p-timeout": "^2.0.1",
+		"read-pkg-up": "^3.0.0",
+		"rxjs": "5.4.3",
+		"semver": "^5.2.0",
+		"split": "^1.0.0",
+		"stream-to-observable": "^0.2.0",
+		"terminal-link": "^1.1.0",
+		"update-notifier": "^2.1.0"
+	},
+	"devDependencies": {
+		"ava": "*",
+		"xo": "*"
+	}
 }