Support emoji (#17)

Author: tonytonyjan

index.js

@@ -1,8 +1,11 @@
 'use strict';
 const stripAnsi = require('strip-ansi');
 const isFullwidthCodePoint = require('is-fullwidth-code-point');
+const emojiRegex = require('emoji-regex')();
 
 module.exports = str => {
+	str = str.replace(emojiRegex, '  ');
+
 	if (typeof str !== 'string' || str.length === 0) {
 		return 0;
 	}

package.json

@@ -45,6 +45,7 @@
 		"fixed-width"
 	],
 	"dependencies": {
+		"emoji-regex": "^7.0.1",
 		"is-fullwidth-code-point": "^2.0.0",
 		"strip-ansi": "^4.0.0"
 	},

test.js

@@ -10,6 +10,10 @@ test('main', t => {
 	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');
 });
 
 test('ignores control characters', t => {