Require Node.js 12 and move to ESM

.github/funding.yml

@@ -1,4 +1,4 @@
-github: [sindresorhus,Qix-]
+github: [sindresorhus, Qix-]
 open_collective: sindresorhus
 tidelift: npm/chalk
 custom: https://sindresorhus.com/donate

.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

benchmark.js

@@ -1,6 +1,5 @@
 /* globals suite, bench */
-'use strict';
-const chalk = require('.');
+import chalk from './index.js';
 
 suite('chalk', () => {
 	const chalkRed = chalk.red;

examples/rainbow.js

@@ -1,5 +1,4 @@
-'use strict';
-const chalk = require('..');
+import chalk from '../index.js';
 
 const ignoreChars = /[^!-~]/g;
 
@@ -17,7 +16,7 @@ function rainbow(string, offset) {
 	let hue = offset % 360;
 	const characters = [];
 	for (const character of string) {
-		if (character.match(ignoreChars)) {
+		if (ignoreChars.test(character)) {
 			characters.push(character);
 		} else {
 			characters.push(chalk.hsl(hue, 100, 50)(character));
@@ -30,8 +29,8 @@ function rainbow(string, offset) {
 
 async function animateString(string) {
 	console.log();
-	for (let i = 0; i < 360 * 5; i++) {
-		console.log('\u001B[1F\u001B[G', rainbow(string, i));
+	for (let index = 0; index < 360 * 5; index++) {
+		console.log('\u001B[1F\u001B[G', rainbow(string, index));
 		await delay(2); // eslint-disable-line no-await-in-loop
 	}
 }

examples/screenshot.js

@@ -1,6 +1,5 @@
-'use strict';
-const styles = require('ansi-styles');
-const chalk = require('..');
+import styles from 'ansi-styles';
+import chalk from '../index.js';
 
 // Generates screenshot
 for (const key of Object.keys(styles)) {