Small tweaks to the escape-case rule

Author: sindresorhus

rules/escape-case.js

@@ -1,5 +1,5 @@
 'use strict';
-const escapeWithLowercase = /\\(x[a-f0-9]{2}|u[a-f0-9]{4}|u\{([0-9a-f]{1,})\}|c[a-z])/;
+const escapeWithLowercase = /\\(x[a-f\d]{2}|u[a-f\d]{4}|u\{([a-f\d]{1,})\}|c[a-z])/;
 const hasLowercaseCharacter = /[a-z]+/;
 const message = 'Use uppercase characters for the value of the escape sequence.';
 
@@ -17,8 +17,13 @@ const fix = value => {
 const create = context => {
 	return {
 		Literal(node) {
-			let matches;
-			if (typeof node.value === 'string' && (matches = node.raw.match(escapeWithLowercase)) && matches[0].slice(2).match(hasLowercaseCharacter)) {
+			if (typeof node.value !== 'string') {
+				return;
+			}
+
+			const matches = node.raw.match(escapeWithLowercase);
+
+			if (matches && matches[0].slice(2).match(hasLowercaseCharacter)) {
 				context.report({
 					node,
 					message,
@@ -27,8 +32,13 @@ const create = context => {
 			}
 		},
 		TemplateElement(node) {
-			let matches;
-			if (typeof node.value.raw === 'string' && (matches = node.value.raw.match(escapeWithLowercase)) && matches[0].slice(2).match(hasLowercaseCharacter)) {
+			if (typeof node.value.raw !== 'string') {
+				return;
+			}
+
+			const matches = node.value.raw.match(escapeWithLowercase);
+
+			if (matches && matches[0].slice(2).match(hasLowercaseCharacter)) {
 				context.report({
 					node,
 					message,