Fix: account for async in function spacing rules

Fixes #1873
Closes gh-1878

Author: hzoo

lib/rules/disallow-spaces-in-anonymous-function-expression.js

@@ -102,6 +102,9 @@ module.exports.prototype = {
 
             if (beforeOpeningRoundBrace) {
                 var functionToken = file.getFirstNodeToken(functionNode);
+                if (node.async && functionToken.value === 'async') {
+                    functionToken = file.getNextToken(functionToken);
+                }
                 errors.assert.noWhitespaceBetween({
                     token: functionToken,
                     nextToken: file.getNextToken(functionToken),

lib/rules/disallow-spaces-in-function-declaration.js

@@ -82,6 +82,9 @@ module.exports.prototype = {
 
             if (beforeOpeningRoundBrace) {
                 var functionToken = file.getFirstNodeToken(node.id);
+                if (node.async && functionToken.value === 'async') {
+                    functionToken = file.getNextToken(functionToken);
+                }
                 errors.assert.noWhitespaceBetween({
                     token: functionToken,
                     nextToken: file.getNextToken(functionToken),

lib/rules/disallow-spaces-in-function.js

@@ -100,6 +100,9 @@ module.exports.prototype = {
 
             if (beforeOpeningRoundBrace) {
                 var functionToken = file.getFirstNodeToken(functionNode);
+                if (node.async && functionToken.value === 'async') {
+                    functionToken = file.getNextToken(functionToken);
+                }
                 errors.assert.noWhitespaceBetween({
                     token: functionToken,
                     nextToken: file.getNextToken(functionToken),

lib/rules/disallow-spaces-in-named-function-expression.js

@@ -93,6 +93,9 @@ module.exports.prototype = {
             if (node.id) {
                 if (beforeOpeningRoundBrace) {
                     var functionToken = file.getFirstNodeToken(functionNode);
+                    if (node.async && functionToken.value === 'async') {
+                        functionToken = file.getNextToken(functionToken);
+                    }
                     errors.assert.noWhitespaceBetween({
                         token: functionToken,
                         nextToken: file.getNextToken(functionToken),

lib/rules/require-spaces-in-anonymous-function-expression.js

@@ -148,6 +148,9 @@ module.exports.prototype = {
 
             if (beforeOpeningRoundBrace) {
                 var functionToken = file.getFirstNodeToken(functionNode);
+                if (node.async && functionToken.value === 'async') {
+                    functionToken = file.getNextToken(functionToken);
+                }
                 errors.assert.whitespaceBetween({
                     token: functionToken,
                     nextToken: file.getNextToken(functionToken),

lib/rules/require-spaces-in-function-declaration.js

@@ -83,6 +83,9 @@ module.exports.prototype = {
             if (beforeOpeningRoundBrace) {
                 // for a named function, use node.id
                 var functionToken = file.getFirstNodeToken(node.id || node);
+                if (node.async && functionToken.value === 'async') {
+                    functionToken = file.getNextToken(functionToken);
+                }
                 errors.assert.whitespaceBetween({
                     token: functionToken,
                     nextToken: file.getNextToken(functionToken),

lib/rules/require-spaces-in-function.js

@@ -35,6 +35,9 @@
  * var x = function () {};
  * var x = function a () {};
  * function a () {}
+ * var x = async function () {};
+ * var x = async function a () {};
+ * async function a () {}
  * ```
  *
  * ##### Valid for mode `{ "beforeOpeningRoundBrace": true }`
@@ -43,6 +46,9 @@
  * var x = function (){};
  * var x = function a (){};
  * function a (){}
+ * var x = async function (){};
+ * var x = async function a (){};
+ * async function a (){}
  * ```
  *
  * ##### Valid for mode `{ "beforeOpeningCurlyBrace": true }`
@@ -51,6 +57,9 @@
  * var x = function() {};
  * var x = function a() {};
  * function a() {}
+ * var x = async function() {};
+ * var x = async function a() {};
+ * async function a() {}
  * ```
  *
  * ##### Invalid for mode `{ "beforeOpeningRoundBrace": true, "beforeOpeningCurlyBrace": true }`
@@ -65,6 +74,15 @@
  * function a() {}
  * function a (){}
  * function a(){}
+ * var x = async function() {};
+ * var x = async function (){};
+ * var x = async function(){};
+ * var x = async function a() {};
+ * var x = async function a (){};
+ * var x = async function a(){};
+ * async function a() {}
+ * async function a (){}
+ * async function a(){}
  * ```
  */
 
@@ -129,6 +147,9 @@ module.exports.prototype = {
 
             if (beforeOpeningRoundBrace) {
                 var functionToken = file.getFirstNodeToken(functionNode);
+                if (node.async && functionToken.value === 'async') {
+                    functionToken = file.getNextToken(functionToken);
+                }
                 errors.assert.whitespaceBetween({
                     token: functionToken,
                     nextToken: file.getNextToken(functionToken),

lib/rules/require-spaces-in-named-function-expression.js

@@ -118,6 +118,9 @@ module.exports.prototype = {
             if (node.id) {
                 if (beforeOpeningRoundBrace) {
                     var functionToken = file.getFirstNodeToken(functionNode);
+                    if (node.async && functionToken.value === 'async') {
+                        functionToken = file.getNextToken(functionToken);
+                    }
                     errors.assert.whitespaceBetween({
                         token: functionToken,
                         nextToken: file.getNextToken(functionToken),

test/specs/rules/require-spaces-in-anonymous-function-expression.js

@@ -89,6 +89,14 @@ describe('rules/require-spaces-in-anonymous-function-expression', function() {
             output: 'var x = function (){}'
         });
 
+        reportAndFix({
+            name: 'missing space before round brace in async FunctionExpression',
+            rules: rules,
+            errors: 1,
+            input: 'var x = async function(){}',
+            output: 'var x = async function (){}'
+        });
+
         reportAndFix({
             name: 'missing space before round brace in method shorthand',
             rules: rules,

test/specs/rules/require-spaces-in-function-declaration.js

@@ -1,5 +1,6 @@
 var Checker = require('../../../lib/checker');
 var expect = require('chai').expect;
+var reportAndFix = require('../../lib/assertHelpers').reportAndFix;
 
 describe('rules/require-spaces-in-function-declaration', function() {
     var checker;
@@ -9,8 +10,10 @@ describe('rules/require-spaces-in-function-declaration', function() {
     });
 
     describe('beforeOpeningRoundBrace', function() {
+        var rules = { esnext: true, requireSpacesInFunctionDeclaration: { beforeOpeningRoundBrace: true } };
+
         beforeEach(function() {
-            checker.configure({ requireSpacesInFunctionDeclaration: { beforeOpeningRoundBrace: true } });
+            checker.configure(rules);
         });
 
         it('should report missing space before round brace in FunctionDeclaration', function() {
@@ -26,6 +29,14 @@ describe('rules/require-spaces-in-function-declaration', function() {
             checker.configure({ esnext: true });
             expect(checker.checkString('export default function (){}')).to.have.no.errors();
         });
+
+        reportAndFix({
+            name: 'missing space before round brace in async FunctionDeclaration',
+            rules: rules,
+            errors: 1,
+            input: 'async function a(){}',
+            output: 'async function a (){}'
+        });
     });
 
     describe('beforeOpeningCurlyBrace', function() {