Require Node.js 12 and move to ESM

.github/funding.yml

@@ -1,2 +1,2 @@
-github: [sindresorhus,Qix-]
+github: [sindresorhus, Qix-]
 tidelift: npm/slice-ansi

.github/workflows/main.yml

@@ -12,10 +12,9 @@ jobs:
         node-version:
           - 14
           - 12
-          - 10
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm install

index.js

@@ -1,7 +1,7 @@
-'use strict';
-const isFullwidthCodePoint = require('is-fullwidth-code-point');
-const astralRegex = require('astral-regex');
-const ansiStyles = require('ansi-styles');
+import isFullwidthCodePoint from 'is-fullwidth-code-point';
+import ansiStyles from 'ansi-styles';
+
+const astralRegex = /^[\uD800-\uDBFF][\uDC00-\uDFFF]$/;
 
 const ESCAPES = [
 	'\u001B',
@@ -41,14 +41,16 @@ const checkAnsi = (ansiCodes, isEscapes, endAnsiCode) => {
 
 		if (endAnsiCode !== undefined) {
 			const fistEscapeCode = wrapAnsi(ansiStyles.codes.get(Number.parseInt(endAnsiCode, 10)));
+			// TODO: Remove the use of `.reduce` here.
+			// eslint-disable-next-line unicorn/no-array-reduce
 			output = output.reduce((current, next) => next === fistEscapeCode ? [next, ...current] : [...current, next], []);
 		}
 	}
 
 	return output.join('');
 };
 
-module.exports = (string, begin, end) => {
+export default function sliceAnsi(string, begin, end) {
 	const characters = [...string];
 	const ansiCodes = [];
 
@@ -81,7 +83,7 @@ module.exports = (string, begin, end) => {
 			visible++;
 		}
 
-		if (!astralRegex({exact: true}).test(character) && isFullwidthCodePoint(character.codePointAt())) {
+		if (!astralRegex.test(character) && isFullwidthCodePoint(character.codePointAt())) {
 			visible++;
 
 			if (typeof end !== 'number') {
@@ -100,4 +102,4 @@ module.exports = (string, begin, end) => {
 	}
 
 	return output;
-};
+}

package.json

@@ -5,8 +5,10 @@
 	"license": "MIT",
 	"repository": "chalk/slice-ansi",
 	"funding": "https://github.com/chalk/slice-ansi?sponsor=1",
+	"type": "module",
+	"exports": "./index.js",
 	"engines": {
-		"node": ">=10"
+		"node": ">=12"
 	},
 	"scripts": {
 		"test": "xo && ava"
@@ -38,15 +40,14 @@
 		"text"
 	],
 	"dependencies": {
-		"ansi-styles": "^4.0.0",
-		"astral-regex": "^2.0.0",
-		"is-fullwidth-code-point": "^3.0.0"
+		"ansi-styles": "^6.0.0",
+		"is-fullwidth-code-point": "^4.0.0"
 	},
 	"devDependencies": {
-		"ava": "^2.1.0",
-		"chalk": "^3.0.0",
-		"random-item": "^3.0.0",
-		"strip-ansi": "^6.0.0",
-		"xo": "^0.26.1"
+		"ava": "^3.15.0",
+		"chalk": "^4.1.0",
+		"random-item": "^4.0.0",
+		"strip-ansi": "^7.0.0",
+		"xo": "^0.38.2"
 	}
 }

readme.md

@@ -11,8 +11,8 @@ $ npm install slice-ansi
 ## Usage
 
 ```js
-const chalk = require('chalk');
-const sliceAnsi = require('slice-ansi');
+import chalk from 'chalk';
+import sliceAnsi from 'slice-ansi';
 
 const string = 'The quick brown ' + chalk.red('fox jumped over ') +
 	'the lazy ' + chalk.green('dog and then ran away with the unicorn.');

test.js

@@ -1,40 +1,41 @@
-import util from 'util';
 import test from 'ava';
 import chalk from 'chalk';
 import stripAnsi from 'strip-ansi';
 import randomItem from 'random-item';
-import sliceAnsi from '.';
+import sliceAnsi from './index.js';
+
+chalk.level = 1;
 
 const fixture = chalk.red('the ') + chalk.green('quick ') + chalk.blue('brown ') + chalk.cyan('fox ') + chalk.yellow('jumped ');
 const stripped = stripAnsi(fixture);
 
 function generate(string) {
-	const rand1 = randomItem(['rock', 'paper', 'scissors']);
-	const rand2 = randomItem(['blue', 'green', 'yellow', 'red']);
-	return `${string}:${chalk[rand2](rand1)} `;
+	const random1 = randomItem(['rock', 'paper', 'scissors']);
+	const random2 = randomItem(['blue', 'green', 'yellow', 'red']);
+	return `${string}:${chalk[random2](random1)} `;
 }
 
 test('main', t => {
 	// The slice should behave exactly as a regular JS slice behaves
-	for (let i = 0; i < 20; i++) {
-		for (let j = 19; j > i; j--) {
-			const nativeSlice = stripped.slice(i, j);
-			const ansiSlice = sliceAnsi(fixture, i, j);
+	for (let index = 0; index < 20; index++) {
+		for (let index2 = 19; index2 > index; index2--) {
+			const nativeSlice = stripped.slice(index, index2);
+			const ansiSlice = sliceAnsi(fixture, index, index2);
 			t.is(nativeSlice, stripAnsi(ansiSlice));
 		}
 	}
 
-	const a = util.inspect('\u001B[31mthe \u001B[39m\u001B[32mquick \u001B[39m');
-	const b = util.inspect('\u001B[34mbrown \u001B[39m\u001B[36mfox \u001B[39m');
-	const c = util.inspect('\u001B[31m \u001B[39m\u001B[32mquick \u001B[39m\u001B[34mbrown \u001B[39m\u001B[36mfox \u001B[39m');
+	const a = JSON.stringify('\u001B[31mthe \u001B[39m\u001B[32mquick \u001B[39m');
+	const b = JSON.stringify('\u001B[34mbrown \u001B[39m\u001B[36mfox \u001B[39m');
+	const c = JSON.stringify('\u001B[31m \u001B[39m\u001B[32mquick \u001B[39m\u001B[34mbrown \u001B[39m\u001B[36mfox \u001B[39m');
 
-	t.is(util.inspect(sliceAnsi(fixture, 0, 10)), a);
-	t.is(util.inspect(sliceAnsi(fixture, 10, 20)), b);
-	t.is(util.inspect(sliceAnsi(fixture, 3, 20)), c);
+	t.is(JSON.stringify(sliceAnsi(fixture, 0, 10)), a);
+	t.is(JSON.stringify(sliceAnsi(fixture, 10, 20)), b);
+	t.is(JSON.stringify(sliceAnsi(fixture, 3, 20)), c);
 
-	const str = generate(1) + generate(2) + generate(3) + generate(4) + generate(5) + generate(6) + generate(7) + generate(8) + generate(9) + generate(10) + generate(11) + generate(12) + generate(13) + generate(14) + generate(15) + generate(1) + generate(2) + generate(3) + generate(4) + generate(5) + generate(6) + generate(7) + generate(8) + generate(9) + generate(10) + generate(11) + generate(12) + generate(13) + generate(14) + generate(15);
-	const native = stripAnsi(str).slice(0, 55);
-	const ansi = stripAnsi(sliceAnsi(str, 0, 55));
+	const string = generate(1) + generate(2) + generate(3) + generate(4) + generate(5) + generate(6) + generate(7) + generate(8) + generate(9) + generate(10) + generate(11) + generate(12) + generate(13) + generate(14) + generate(15) + generate(1) + generate(2) + generate(3) + generate(4) + generate(5) + generate(6) + generate(7) + generate(8) + generate(9) + generate(10) + generate(11) + generate(12) + generate(13) + generate(14) + generate(15);
+	const native = stripAnsi(string).slice(0, 55);
+	const ansi = stripAnsi(sliceAnsi(string, 0, 55));
 	t.is(native, ansi);
 });
 
@@ -90,7 +91,7 @@ test('doesn\'t add extra escapes', t => {
 	const output = `${chalk.black.bgYellow(' RUNS ')}  ${chalk.green('test')}`;
 	t.is(sliceAnsi(output, 0, 7), `${chalk.black.bgYellow(' RUNS ')} `);
 	t.is(sliceAnsi(output, 0, 8), `${chalk.black.bgYellow(' RUNS ')}  `);
-	t.is(sliceAnsi('\u001B[31m' + output, 0, 4), `\u001B[31m${chalk.black.bgYellow(' RUN')}`);
+	t.is(JSON.stringify(sliceAnsi('\u001B[31m' + output, 0, 4)), JSON.stringify(`\u001B[31m${chalk.black.bgYellow(' RUN')}`));
 });
 
 // See https://github.com/chalk/slice-ansi/issues/26