[Refactor] improve eslint settings

.eslintrc

@@ -9,18 +9,34 @@
 	},
 	"rules": {
 		"consistent-return": 1,
-		"dot-notation": [2, { "allowKeywords": true }],
 		"func-name-matching": 0,
 		"max-nested-callbacks": 0,
 		"max-params": [2, 4],
-		"no-console": 0,
 		"sort-keys": 0,
+
+		"comma-dangle": [2, {
+			"arrays": "always-multiline",
+			"objects": "always-multiline",
+			"imports": "always-multiline",
+			"exports": "always-multiline",
+			"functions": "never",
+		}],
+		"dot-notation": [2, { "allowKeywords": true }],
+		"no-console": 0,
+		"object-shorthand": [2, "always"],
+		"prefer-const": 2,
+		"quote-props": [2, "as-needed", {
+			"keywords": false,
+			"numbers": true,
+			"unnecessary": true,
+		}],
 	},
 	"overrides": [
 		{
 			"files": "test*",
 			"rules": {
 				"max-nested-callbacks": 0,
+				"max-params": 0,
 			},
 		},
 	],

bin.js

@@ -17,33 +17,33 @@ const {
 	argv: {
 		output,
 		date,
-		'package': pkg
-	}
+		package: pkg,
+	},
 } = require('yargs')
 	.help()
 	.option('date', {
 		type: 'string',
 		describe: '“now”, or a date (same format as `new Date()`)',
 		demandOption: true,
-		coerce: function (arg) {
+		coerce(arg) {
 			if (arg !== 'now' && !new Date(arg).getTime()) {
 				throw new TypeError('`date` must be “now” or a valid format for `new Date`');
 			}
 			return arg;
-		}
+		},
 	})
 	.option('package', {
 		type: 'string',
 		describe: 'path to a `package.json` file',
 		normalize: true,
-		coerce: function (arg) { return path.resolve(arg); }
+		coerce(arg) { return path.resolve(arg); },
 	})
 	.default('package', filename, path.relative(process.cwd(), filename))
 	.option('output', {
 		alias: 'o',
 		describe: 'output file path',
 		normalize: true,
-		demandOption: true
+		demandOption: true,
 	});
 
 getLockfile(pkg, date === 'now' ? undefined : date, { logger: console.log.bind(console), npmNeeded: '^6.9.0-0' })

getLockfile.js

@@ -24,7 +24,7 @@ module.exports = function getLockfile(packageFile, date, { npmNeeded, logger = (
 		logger(chalk.blue(`Creating \`package.json\` in temp dir for ${date || '“now”'} lockfile`));
 		return Promise.all([
 			copyFile(packageFile, path.join(tmpDir, 'package.json')),
-			copyFile(npmRC, path.join(tmpDir, '.npmrc'))
+			copyFile(npmRC, path.join(tmpDir, '.npmrc')),
 		]);
 	});
 	return Promise.all([tmpDirP, copyPkg]).then(([tmpDir]) => new Promise((resolve, reject) => {

getProjectTempDir.js

@@ -30,15 +30,15 @@ const getRootTempDir = function getRootTempDir(npmNeeded, logger = () => {}) {
 			cleanupHandlers.push(cleanup);
 			nodeCleanup(finalCleanup);
 		})).then(tmpDir => {
-			var npmV = execSync('npm --version', { encoding: 'utf-8', cwd: tmpDir });
+			const npmV = execSync('npm --version', { encoding: 'utf-8', cwd: tmpDir });
 			logger(`${chalk.blue('Checking npm version:')} \`npm --version\` -> v${npmV}`);
 			if (!semver.satisfies(npmV, npmNeeded)) {
 				const pkgContents = {
-					'private': true,
+					private: true,
 					name: 'npm-jail',
 					dependencies: {
-						npm: npmNeeded
-					}
+						npm: npmNeeded,
+					},
 				};
 				return writeFile(
 					path.join(tmpDir, 'package.json'),