Require Node.js 6

Author: sindresorhus

.gitattributes

@@ -1,2 +1 @@
-* text=auto
-*.js text eol=lf
+* text=auto eol=lf

.travis.yml

@@ -1,14 +1,12 @@
 language: node_js
 node_js:
+  - '10'
   - '8'
   - '6'
-  - '4'
 matrix:
   include:
-    - node_js: 8
+    - node_js: 10
       env: INTEGRATION=true
-before_install:
-  - npm install --global npm
 script:
   - "[ \"$INTEGRATION\" = true ] && npm run integration || npm test"
 after_success: npm run coveralls

package.json

@@ -10,7 +10,7 @@
 		"url": "sindresorhus.com"
 	},
 	"engines": {
-		"node": ">=4"
+		"node": ">=6"
 	},
 	"scripts": {
 		"test": "nyc ava",
@@ -48,9 +48,9 @@
 		"del": "^3.0.0",
 		"eslint": "^5.0.0",
 		"eslint-ava-rule-tester": "^2.0.0",
-		"execa": "^0.9.0",
-		"listr": "^0.13.0",
-		"nyc": "^11.0.3",
+		"execa": "^0.10.0",
+		"listr": "^0.14.1",
+		"nyc": "^12.0.2",
 		"pify": "^3.0.0",
 		"tempy": "^0.2.1",
 		"xo": "*"

rules/catch-error-name.js

@@ -4,13 +4,13 @@ const getDocsUrl = require('./utils/get-docs-url');
 
 // Matches `someObj.then([FunctionExpression | ArrowFunctionExpression])`
 function isLintablePromiseCatch(node) {
-	const callee = node.callee;
+	const {callee} = node;
 
 	if (callee.type !== 'MemberExpression') {
 		return false;
 	}
 
-	const property = callee.property;
+	const {property} = callee;
 
 	if (property.type !== 'Identifier' || property.name !== 'catch') {
 		return false;
@@ -20,7 +20,7 @@ function isLintablePromiseCatch(node) {
 		return false;
 	}
 
-	const arg0 = node.arguments[0];
+	const [arg0] = node.arguments;
 
 	return arg0.type === 'FunctionExpression' || arg0.type === 'ArrowFunctionExpression';
 }
@@ -42,7 +42,7 @@ const create = context => {
 		caughtErrorsIgnorePattern: '^_$'
 	}, context.options[0]);
 
-	const name = options.name;
+	const {name} = options;
 	const caughtErrorsIgnorePattern = new RegExp(options.caughtErrorsIgnorePattern);
 	const stack = [];
 
@@ -68,7 +68,7 @@ const create = context => {
 	return {
 		CallExpression: node => {
 			if (isLintablePromiseCatch(node)) {
-				const params = node.arguments[0].params;
+				const {params} = node.arguments[0];
 
 				if (params.length > 0 && params[0].name === '_') {
 					push(!astUtils.containsIdentifier('_', node.arguments[0].body));

rules/custom-error-definition.js

@@ -18,10 +18,10 @@ const hasValidSuperClass = node => {
 		return false;
 	}
 
-	let name = node.superClass.name;
+	let {name} = node.superClass;
 
 	if (node.superClass.type === 'MemberExpression') {
-		name = node.superClass.property.name;
+		({name} = node.superClass.property);
 	}
 
 	return nameRegexp.test(name);
@@ -48,7 +48,7 @@ const customErrorDefinition = (context, node) => {
 		return;
 	}
 
-	const name = node.id.name;
+	const {name} = node.id;
 	const className = getClassName(name);
 
 	if (name !== className) {
@@ -58,8 +58,7 @@ const customErrorDefinition = (context, node) => {
 		});
 	}
 
-	const body = node.body.body;
-
+	const {body} = node.body;
 	const constructor = body.find(x => x.kind === 'constructor');
 
 	if (!constructor) {

rules/explicit-length-check.js

@@ -36,13 +36,14 @@ function checkZeroType(context, node) {
 }
 
 function checkNonZeroType(context, node, type) {
-	const value = node.right.value;
-	const operator = node.operator;
+	const {value} = node.right;
+	const {operator} = node;
 
 	switch (type) {
 		case 'greater-than':
-			if ((operatorTypes.gte.indexOf(operator) !== -1 && value === 1) ||
-				(operatorTypes.ne.indexOf(operator) !== -1 && value === 0)
+			if (
+				(operatorTypes.gte.includes(operator) && value === 1) ||
+				(operatorTypes.ne.includes(operator) && value === 0)
 			) {
 				reportError(
 					context,
@@ -57,8 +58,9 @@ function checkNonZeroType(context, node, type) {
 			}
 			break;
 		case 'greater-than-or-equal':
-			if ((operatorTypes.gt.indexOf(operator) !== -1 && value === 0) ||
-				(operatorTypes.ne.indexOf(operator) !== -1 && value === 0)
+			if (
+				(operatorTypes.gt.includes(operator) && value === 0) ||
+				(operatorTypes.ne.includes(operator) && value === 0)
 			) {
 				reportError(
 					context,
@@ -73,8 +75,9 @@ function checkNonZeroType(context, node, type) {
 			}
 			break;
 		case 'not-equal':
-			if ((operatorTypes.gt.indexOf(operator) !== -1 && value === 0) ||
-				(operatorTypes.gte.indexOf(operator) !== -1 && value === 1)
+			if (
+				(operatorTypes.gt.includes(operator) && value === 0) ||
+				(operatorTypes.gte.includes(operator) && value === 1)
 			) {
 				reportError(
 					context,

rules/new-for-builtins.js

@@ -36,7 +36,7 @@ const disallowNew = new Set([
 const create = context => {
 	return {
 		CallExpression: node => {
-			const name = node.callee.name;
+			const {name} = node.callee;
 
 			if (enforceNew.has(name)) {
 				context.report({
@@ -47,7 +47,7 @@ const create = context => {
 			}
 		},
 		NewExpression: node => {
-			const name = node.callee.name;
+			const {name} = node.callee;
 
 			if (disallowNew.has(name)) {
 				context.report({

rules/no-abusive-eslint-disable.js

@@ -5,11 +5,12 @@ const disableRegex = /^eslint-disable(-next-line|-line)?($|(\s+(@[\w-]+\/[\w-]+\
 
 const create = context => ({
 	Program: node => {
-		node.comments.forEach(comment => {
+		for (const comment of node.comments) {
 			const value = comment.value.trim();
 			const res = disableRegex.exec(value);
 
-			if (res && // It's a eslint-disable comment
+			if (
+				res && // It's a eslint-disable comment
 				!res[2] // But it did not specify any rules
 			) {
 				context.report({
@@ -24,7 +25,7 @@ const create = context => ({
 					data: comment.loc.start
 				});
 			}
-		});
+		}
 	}
 });
 

rules/no-fn-reference-in-iterator.js

@@ -34,7 +34,7 @@ const fix = (context, node) => {
 const create = context => ({
 	'CallExpression[callee.object.name!="Promise"]': node => {
 		if (isIteratorMethod(node) && hasFunctionArgument(node)) {
-			const arg = node.arguments[0];
+			const [arg] = node.arguments;
 
 			context.report({
 				node: arg,

rules/no-process-exit.js

@@ -12,7 +12,7 @@ const create = context => {
 
 	return {
 		CallExpression: node => {
-			const callee = node.callee;
+			const {callee} = node;
 
 			if (callee.type === 'MemberExpression' && callee.object.name === 'process') {
 				if (callee.property.name === 'on' || callee.property.name === 'once') {

rules/no-unsafe-regex.js

@@ -32,7 +32,7 @@ const create = context => {
 			let flags = null;
 
 			if (hasRegExp) {
-				pattern = args[0].regex.pattern;
+				({pattern} = args[0].regex);
 				flags = args[1] && args[1].type === 'Literal' ? args[1].value : args[0].regex.flags;
 			} else {
 				pattern = args[0].value;

rules/prefer-spread.js

@@ -2,7 +2,7 @@
 const getDocsUrl = require('./utils/get-docs-url');
 
 const isArrayFrom = node => {
-	const callee = node.callee;
+	const {callee} = node;
 	return (
 		callee.type === 'MemberExpression' &&
 		callee.object.type === 'Identifier' &&

rules/prefer-starts-ends-with.js

@@ -11,7 +11,7 @@ const isSimpleString = string => doesNotContain(
 const create = context => {
 	return {
 		CallExpression(node) {
-			const callee = node.callee;
+			const {callee} = node;
 			const prop = callee.property;
 
 			if (!(prop && callee.type === 'MemberExpression')) {
@@ -22,9 +22,9 @@ const create = context => {
 
 			let regex;
 			if (prop.name === 'test' && callee.object.regex) {
-				regex = callee.object.regex;
+				({regex} = callee.object);
 			} else if (prop.name === 'match' && args && args[0] && args[0].regex) {
-				regex = args[0].regex;
+				({regex} = args[0]);
 			} else {
 				return;
 			}
@@ -33,7 +33,7 @@ const create = context => {
 				return;
 			}
 
-			const pattern = regex.pattern;
+			const {pattern} = regex;
 			if (pattern.startsWith('^') && isSimpleString(pattern.slice(1))) {
 				context.report({
 					node,

rules/regex-shorthand.js

@@ -8,7 +8,7 @@ const create = context => {
 	return {
 		'Literal[regex]': node => {
 			const oldPattern = node.regex.pattern;
-			const flags = node.regex.flags;
+			const {flags} = node.regex;
 
 			const newPattern = cleanRegexp(oldPattern, flags);
 

test/prefer-type-error.js

@@ -304,6 +304,6 @@ ruleTester.run('prefer-type-error', rule, {
 			errors
 		}
 	].concat(
-		Array.from(tcIdentifiers).map(identifier => tcIdentifierInvalidTest(identifier))
+		[...tcIdentifiers].map(identifier => tcIdentifierInvalidTest(identifier))
 	)
 });