Fix.

node_modules/cssstyle/scripts/generate_implemented_properties.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const t = require('babel-types');
+const generate = require('babel-generator').default;
+const camelToDashed = require('../lib/parsers').camelToDashed;
+
+const dashedProperties = fs
+  .readdirSync(path.resolve(__dirname, '../lib/properties'))
+  .filter(propertyFile => propertyFile.substr(-3) === '.js')
+  .map(propertyFile => camelToDashed(propertyFile.replace('.js', '')));
+
+const out_file = fs.createWriteStream(path.resolve(__dirname, '../lib/implementedProperties.js'), {
+  encoding: 'utf-8',
+});
+var date_today = new Date();
+out_file.write(
+  "'use strict';\n\n// autogenerated - " +
+    (date_today.getMonth() + 1 + '/' + date_today.getDate() + '/' + date_today.getFullYear()) +
+    '\n\n'
+);
+out_file.write('/*\n *\n * https://www.w3.org/Style/CSS/all-properties.en.html\n */\n\n');
+
+const statements = [];
+statements.push(
+  t.variableDeclaration('var', [
+    t.variableDeclarator(
+      t.identifier('implementedProperties'),
+      t.newExpression(t.identifier('Set'), [])
+    ),
+  ])
+);
+
+dashedProperties.forEach(property => {
+  statements.push(
+    t.expressionStatement(
+      t.callExpression(
+        t.memberExpression(t.identifier('implementedProperties'), t.identifier('add')),
+        [t.stringLiteral(property)]
+      )
+    )
+  );
+});
+
+statements.push(
+  t.expressionStatement(
+    t.assignmentExpression(
+      '=',
+      t.memberExpression(t.identifier('module'), t.identifier('exports')),
+      t.identifier('implementedProperties')
+    )
+  )
+);
+
+out_file.write(generate(t.program(statements)).code + '\n');
+out_file.end(function(err) {
+  if (err) {
+    throw err;
+  }
+});