fix: ensure node4 compat

@commitlint/cli/cli.js

@@ -16,8 +16,8 @@ const help = require('./help');
  */
 const rules = {
 	fromStdin: (input, flags) => input.length === 0 &&
-		flags.from === null &&
-		flags.to === null &&
+		typeof flags.from !== 'string' &&
+		typeof flags.to !== 'string' &&
 		!flags.edit
 };
 
@@ -62,7 +62,8 @@ const cli = meow({
 const load = seed => core.load(seed);
 
 function main(options) {
-	const {input: raw, flags} = options;
+	const raw = options.input;
+	const flags = options.flags;
 	const fromStdin = rules.fromStdin(raw, flags);
 
 	const range = pick(flags, 'edit', 'from', 'to');
@@ -93,8 +94,10 @@ function main(options) {
 	));
 }
 
-function getSeed({extends: e}) {
-	return e ? {extends: e.split(', ')} : {};
+function getSeed(seed) {
+	const e = Array.isArray(seed.extends) ? seed.extends : [seed.extends];
+	const n = e.filter(i => typeof i === 'string');
+	return n.length > 0 ? {extends: n} : {};
 }
 
 // Start the engine

@commitlint/cli/help.js

@@ -1,7 +1,8 @@
 module.exports = configuration => {
 	const lines = Object.entries(configuration.description)
 		.map(entry => {
-			const [name, desc] = entry;
+			const name = entry[0];
+			const desc = entry[1];
 			const alias = Object.entries(configuration.alias)
 				.find(entry => entry[1] === name)
 				.map(entry => entry[0])[0];
@@ -11,14 +12,16 @@ module.exports = configuration => {
 
 	const longest = lines
 		.map(line => {
-			const [flags] = line;
+			const flags = line[0];
 			return flags.reduce((sum, flag) => sum + flag.length, 0);
 		})
 		.sort(Number)[0];
 
 	return lines
 		.map(line => {
-			const [flags, desc, defaults] = line;
+			const flags = line[0];
+			const desc = line[1];
+			const defaults = line[2];
 			const fs = flags.map(flag => flag.length > 1 ? `--${flag}` : `-${flag}`);
 			const ds = defaults ? `, defaults to: ${defaults}` : '';
 			const length = flags.reduce((sum, flag) => sum + flag.length, 0);

@commitlint/core/src/library/resolve-extends.js

@@ -1,6 +1,6 @@
 import path from 'path';
 import from from 'resolve-from';
-import {merge, omit, values} from 'lodash';
+import {merge, omit} from 'lodash';
 
 // Resolve extend configs
 export default function resolveExtends(config = {}, context = {}) {
@@ -18,8 +18,7 @@ export default function resolveExtends(config = {}, context = {}) {
 
 // (any, string, string, Function) => any[];
 function loadExtends(config = {}, context = {}) {
-	const toExtend = values(config.extends || []);
-	return toExtend.reduce((configs, raw) => {
+	return (config.extends || []).reduce((configs, raw) => {
 		const id = getId(raw, context.prefix);
 		const resolve = context.resolve || resolveId;
 		const resolved = resolve(id, context);
@@ -46,7 +45,6 @@ function getId(raw = '', prefix = '') {
 	return (scoped || relative) ? raw : [prefix, raw].filter(String).join('-');
 }
 
-function resolveId(id, context) {
-	const cwd = context.cwd || process.cwd();
-	return from(cwd, id);
+function resolveId(id, context = {}) {
+	return from(context.cwd || process.cwd(), id);
 }