diff --git a/.travis.yml b/.travis.yml
index 1492647..fd301d7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,5 @@ language: node_js
 node_js:
   - '12'
   - '10'
-  - '8'
 after_success:
   - './node_modules/.bin/nyc report --reporter=text-lcov | ./node_modules/.bin/coveralls'
diff --git a/examples/screenshot.js b/examples/screenshot.js
index 37f5850..fc64030 100644
--- a/examples/screenshot.js
+++ b/examples/screenshot.js
@@ -4,15 +4,15 @@ const chalk = require('..');
 
 // Generates screenshot
 for (const key of Object.keys(styles)) {
-	let ret = key;
+	let returnValue = key;
 
 	if (key === 'reset' || key === 'hidden' || key === 'grey') {
 		continue;
 	}
 
 	if (/^bg[^B]/.test(key)) {
-		ret = chalk.black(ret);
+		returnValue = chalk.black(returnValue);
 	}
 
-	process.stdout.write(chalk[key](ret) + ' ');
+	process.stdout.write(chalk[key](returnValue) + ' ');
 }
diff --git a/index.d.ts b/index.d.ts
index 2f8271b..df96b03 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -91,12 +91,10 @@ declare namespace chalk {
 		level?: Level;
 	}
 
-	interface Instance {
-		/**
-		Return a new Chalk instance.
-		*/
-		new (options?: Options): Chalk;
-	}
+	/**
+	Return a new Chalk instance.
+	*/
+	type Instance = new (options?: Options) => Chalk;
 
 	/**
 	Detect whether the terminal supports color.
diff --git a/index.test-d.ts b/index.test-d.ts
index 0b26797..ad5dcf5 100644
--- a/index.test-d.ts
+++ b/index.test-d.ts
@@ -6,16 +6,20 @@ type colorReturn = chalk.Chalk & {supportsColor?: never};
 
 // - supportsColor -
 expectType<chalk.ColorSupport | false>(chalk.supportsColor);
-expectType<boolean>((chalk.supportsColor as chalk.ColorSupport).hasBasic);
-expectType<boolean>((chalk.supportsColor as chalk.ColorSupport).has256);
-expectType<boolean>((chalk.supportsColor as chalk.ColorSupport).has16m);
+if (chalk.supportsColor) {
+	expectType<boolean>(chalk.supportsColor.hasBasic);
+	expectType<boolean>(chalk.supportsColor.has256);
+	expectType<boolean>(chalk.supportsColor.has16m);
+}
 
 // - stderr -
 expectType<chalk.Chalk>(chalk.stderr);
 expectType<chalk.ColorSupport | false>(chalk.stderr.supportsColor);
-expectType<boolean>((chalk.stderr.supportsColor as chalk.ColorSupport).hasBasic);
-expectType<boolean>((chalk.stderr.supportsColor as chalk.ColorSupport).has256);
-expectType<boolean>((chalk.stderr.supportsColor as chalk.ColorSupport).has16m);
+if (chalk.stderr.supportsColor) {
+	expectType<boolean>(chalk.stderr.supportsColor.hasBasic);
+	expectType<boolean>(chalk.stderr.supportsColor.has256);
+	expectType<boolean>(chalk.stderr.supportsColor.has16m);
+}
 
 // -- `stderr` is not a member of the Chalk interface --
 expectError(chalk.reset.stderr);
diff --git a/package.json b/package.json
index 0a4aaa9..822c963 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
 	"funding": "https://github.com/chalk/chalk?sponsor=1",
 	"main": "source",
 	"engines": {
-		"node": ">=8"
+		"node": ">=10"
 	},
 	"scripts": {
 		"test": "xo && nyc ava && tsd",
@@ -47,18 +47,22 @@
 	"devDependencies": {
 		"ava": "^2.4.0",
 		"coveralls": "^3.0.7",
-		"execa": "^3.2.0",
+		"execa": "^4.0.0",
 		"import-fresh": "^3.1.0",
 		"matcha": "^0.7.0",
 		"nyc": "^15.0.0",
 		"resolve-from": "^5.0.0",
 		"tsd": "^0.7.4",
-		"xo": "^0.25.3"
+		"xo": "^0.28.2"
 	},
 	"xo": {
 		"rules": {
 			"unicorn/prefer-string-slice": "off",
-			"unicorn/prefer-includes": "off"
+			"unicorn/prefer-includes": "off",
+			"@typescript-eslint/member-ordering": "off",
+			"no-redeclare": "off",
+			"unicorn/string-content": "off",
+			"unicorn/better-regex": "off"
 		}
 	}
 }
diff --git a/source/index.js b/source/index.js
index 203b1b3..e3b2f16 100644
--- a/source/index.js
+++ b/source/index.js
@@ -17,7 +17,7 @@ const levelMapping = [
 const styles = Object.create(null);
 
 const applyOptions = (object, options = {}) => {
-	if (!Number.isInteger(options.level) || options.level > 3 || options.level < 0) {
+	if (options.level && !(Number.isInteger(options.level) && options.level >= 0 && options.level <= 3)) {
 		throw new Error('The `level` option should be an integer from 0 to 3');
 	}
 
@@ -28,6 +28,7 @@ const applyOptions = (object, options = {}) => {
 
 class ChalkClass {
 	constructor(options) {
+		// eslint-disable-next-line no-constructor-return
 		return chalkFactory(options);
 	}
 }
diff --git a/source/templates.js b/source/templates.js
index fe94642..b130949 100644
--- a/source/templates.js
+++ b/source/templates.js
@@ -2,7 +2,7 @@
 const TEMPLATE_REGEX = /(?:\\(u(?:[a-f\d]{4}|\{[a-f\d]{1,6}\})|x[a-f\d]{2}|.))|(?:\{(~)?(\w+(?:\([^)]*\))?(?:\.\w+(?:\([^)]*\))?)*)(?:[ \t]|(?=\r?\n)))|(\})|((?:.|[\r\n\f])+?)/gi;
 const STYLE_REGEX = /(?:^|\.)(\w+)(?:\(([^)]*)\))?/g;
 const STRING_REGEX = /^(['"])((?:\\.|(?!\1)[^\\])*)\1$/;
-const ESCAPE_REGEX = /\\(u(?:[a-f\d]{4}|\{[a-f\d]{1,6}\})|x[a-f\d]{2}|.)|([^\\])/gi;
+const ESCAPE_REGEX = /\\(u(?:[a-f\d]{4}|{[a-f\d]{1,6}})|x[a-f\d]{2}|.)|([^\\])/gi;
 
 const ESCAPES = new Map([
 	['n', '\n'],
@@ -126,8 +126,8 @@ module.exports = (chalk, temporary) => {
 	chunks.push(chunk.join(''));
 
 	if (styles.length > 0) {
-		const errMsg = `Chalk template literal is missing ${styles.length} closing bracket${styles.length === 1 ? '' : 's'} (\`}\`)`;
-		throw new Error(errMsg);
+		const errMessage = `Chalk template literal is missing ${styles.length} closing bracket${styles.length === 1 ? '' : 's'} (\`}\`)`;
+		throw new Error(errMessage);
 	}
 
 	return chunks.join('');
diff --git a/test/template-literal.js b/test/template-literal.js
index ece1428..98e01c6 100644
--- a/test/template-literal.js
+++ b/test/template-literal.js
@@ -121,8 +121,8 @@ test('correctly parse newline escapes (bug #177)', t => {
 
 test('correctly parse escape in parameters (bug #177 comment 318622809)', t => {
 	const instance = new chalk.Instance({level: 0});
-	const str = '\\';
-	t.is(instance`{blue ${str}}`, '\\');
+	const string = '\\';
+	t.is(instance`{blue ${string}}`, '\\');
 });
 
 test('correctly parses unicode/hex escapes', t => {