Require Node.js 6

Author: sindresorhus

.gitattributes

@@ -1,2 +1 @@
-* text=auto
-*.js text eol=lf
+* text=auto eol=lf

.travis.yml

@@ -1,5 +1,5 @@
 language: node_js
 node_js:
+  - '10'
   - '8'
   - '6'
-  - '4'

index.js

@@ -3,19 +3,19 @@ const stripAnsi = require('strip-ansi');
 const isFullwidthCodePoint = require('is-fullwidth-code-point');
 const emojiRegex = require('emoji-regex')();
 
-module.exports = str => {
-	str = str.replace(emojiRegex, '  ');
+module.exports = input => {
+	input = input.replace(emojiRegex, '  ');
 
-	if (typeof str !== 'string' || str.length === 0) {
+	if (typeof input !== 'string' || input.length === 0) {
 		return 0;
 	}
 
-	str = stripAnsi(str);
+	input = stripAnsi(input);
 
 	let width = 0;
 
-	for (let i = 0; i < str.length; i++) {
-		const code = str.codePointAt(i);
+	for (let i = 0; i < input.length; i++) {
+		const code = input.codePointAt(i);
 
 		// Ignore control characters
 		if (code <= 0x1F || (code >= 0x7F && code <= 0x9F)) {

package.json

@@ -10,7 +10,7 @@
 		"url": "sindresorhus.com"
 	},
 	"engines": {
-		"node": ">=4"
+		"node": ">=6"
 	},
 	"scripts": {
 		"test": "xo && ava"
@@ -47,10 +47,10 @@
 	"dependencies": {
 		"emoji-regex": "^7.0.1",
 		"is-fullwidth-code-point": "^2.0.0",
-		"strip-ansi": "^4.0.0"
+		"strip-ansi": "^5.0.0"
 	},
 	"devDependencies": {
-		"ava": "*",
-		"xo": "*"
+		"ava": "^1.0.1",
+		"xo": "^0.23.0"
 	}
 }

test.js

@@ -1,30 +1,30 @@
 import test from 'ava';
-import m from '.';
+import stringWidth from '.';
 
 test('main', t => {
-	t.is(m('abcde'), 5);
-	t.is(m('古池や'), 6);
-	t.is(m('あいうabc'), 9);
-	t.is(m('ノード.js'), 9);
-	t.is(m('你好'), 4);
-	t.is(m('안녕하세요'), 10);
-	t.is(m('A\uD83C\uDE00BC'), 5, 'surrogate');
-	t.is(m('\u001B[31m\u001B[39m'), 0);
-	t.is(m('\u{231A}'), 2, '⌚ default emoji presentation character (Emoji_Presentation)');
-	t.is(m('\u{2194}\u{FE0F}'), 2, '↔️ default text presentation character rendered as emoji');
-	t.is(m('\u{1F469}'), 2, '👩 emoji modifier base (Emoji_Modifier_Base)');
-	t.is(m('\u{1F469}\u{1F3FF}'), 2, '👩🏿 emoji modifier base followed by a modifier');
+	t.is(stringWidth('abcde'), 5);
+	t.is(stringWidth('古池や'), 6);
+	t.is(stringWidth('あいうabc'), 9);
+	t.is(stringWidth('ノード.js'), 9);
+	t.is(stringWidth('你好'), 4);
+	t.is(stringWidth('안녕하세요'), 10);
+	t.is(stringWidth('A\uD83C\uDE00BC'), 5, 'surrogate');
+	t.is(stringWidth('\u001B[31m\u001B[39m'), 0);
+	t.is(stringWidth('\u{231A}'), 2, '⌚ default emoji presentation character (Emoji_Presentation)');
+	t.is(stringWidth('\u{2194}\u{FE0F}'), 2, '↔️ default text presentation character rendered as emoji');
+	t.is(stringWidth('\u{1F469}'), 2, '👩 emoji modifier base (Emoji_Modifier_Base)');
+	t.is(stringWidth('\u{1F469}\u{1F3FF}'), 2, '👩🏿 emoji modifier base followed by a modifier');
 });
 
 test('ignores control characters', t => {
-	t.is(m(String.fromCharCode(0)), 0);
-	t.is(m(String.fromCharCode(31)), 0);
-	t.is(m(String.fromCharCode(127)), 0);
-	t.is(m(String.fromCharCode(134)), 0);
-	t.is(m(String.fromCharCode(159)), 0);
-	t.is(m('\u001B'), 0);
+	t.is(stringWidth(String.fromCharCode(0)), 0);
+	t.is(stringWidth(String.fromCharCode(31)), 0);
+	t.is(stringWidth(String.fromCharCode(127)), 0);
+	t.is(stringWidth(String.fromCharCode(134)), 0);
+	t.is(stringWidth(String.fromCharCode(159)), 0);
+	t.is(stringWidth('\u001B'), 0);
 });
 
 test('handles combining characters', t => {
-	t.is(m('x\u0300'), 1);
+	t.is(stringWidth('x\u0300'), 1);
 });