Merge pull request plotly#7501 from plotly/cam/specify-acorn-ecmaVersion

Add ECMAScript version to Falafel/Acorn.js config

Author: camdecoster

tasks/find_locale_strings.js

@@ -28,7 +28,7 @@ function findLocaleStrings() {
             var code = fs.readFileSync(file, 'utf-8');
             var filePartialPath = file.substr(constants.pathToSrc.length);
 
-            falafel(code, {locations: true}, function(node) {
+            falafel(code, { ecmaVersion: 'latest', locations: true }, function(node) {
                 if(node.type === 'CallExpression' &&
                     (node.callee.name === '_' || node.callee.source() === 'Lib._')
                 ) {

tasks/shard_jasmine_tests.js

@@ -29,7 +29,7 @@ glob(path.join(pathToJasmineTests, '*.js')).then((files) => {
         var code = fs.readFileSync(file, 'utf-8');
         var bn = path.basename(file);
 
-        falafel(code, function(node) {
+        falafel(code, { ecmaVersion: 'latest' }, function(node) {
             if(isJasmineTestIt(node, tag)) {
                 if(file2cnt[bn]) {
                     file2cnt[bn]++;

tasks/test_syntax.js

@@ -42,7 +42,7 @@ function assertJasmineSuites() {
             var code = fs.readFileSync(file, 'utf-8');
             var bn = path.basename(file);
 
-            falafel(code, {locations: true}, function(node) {
+            falafel(code, { ecmaVersion: 'latest', locations: true }, function(node) {
                 var lineInfo = '[line ' + node.loc.start.line + '] :';
 
                 if(node.type === 'Identifier' && BLACK_LIST.indexOf(node.name) !== -1) {
@@ -108,7 +108,7 @@ function assertSrcContents() {
 
             // parse through code string while keeping track of comments
             var comments = [];
-            falafel(code, {onComment: comments, locations: true}, function(node) {
+            falafel(code, { ecmaVersion: 'latest', locations: true, onComment: comments }, function(node) {
                 // look for .classList
                 if(node.type === 'MemberExpression') {
                     var source = node.source();

tasks/util/update_version.js

@@ -7,7 +7,7 @@ var pkg = require('../../package.json');
 
 module.exports = function updateVersion(pathToFile) {
     fs.readFile(pathToFile, 'utf-8', function(err, code) {
-        var out = falafel(code, function(node) {
+        var out = falafel(code, { ecmaVersion: 'latest' }, function(node) {
             if(isVersionNode(node)) node.update('\'' + pkg.version + '\'');
         });