Fix build script for private-class-elements

Author: goto-bus-stop

build.js

@@ -31,4 +31,6 @@ compile('acorn-class-fields', './lib/class-fields/index.js', privateClassElement
 compile('acorn-static-class-features', './lib/static-class-features/index.js', privateClassElements)
 compile('acorn-private-class-elements', './lib/private-class-elements/index.js', function (str) {
   return str.replace('class extends Parser', 'class Parser_ extends Parser')
+    // it also works with v7
+    .replace('if (acorn.version.indexOf("6.") != 0 || acorn.version.indexOf("6.0.") == 0) {', 'if (false) {')
 })

lib/private-class-elements/index.js

@@ -3,11 +3,9 @@
 "use strict"
 
 var acorn = require("acorn")
-/* MANUALLY EDITED DESPITE THE ABOVE WARNING :D
-if (acorn.version.indexOf("6.") != 0 || acorn.version.indexOf("6.0.") == 0) {
+if (false) {
   throw new Error(("acorn-private-class-elements requires acorn@^6.1.0, not " + (acorn.version)))
 }
-*/
 var tt = acorn.tokTypes
 var TokenType = acorn.TokenType