fix(gatsby-plugin-mdx): Fix Safari 9 const syntax error (#15644)

`SyntaxError: Unexpected keyword 'const'. Const declarations are not supported in strict mode.` Gatsby sites using mdx break in Safari 9 (possibly other older browsers) because it's using es6 `const`.
gatsbyjs · Jul 12, 2019 · a823463 · a823463
1 parent bfc2891
commit a823463
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/gatsby-plugin-mdx/loaders/mdx-scopes.js b/packages/gatsby-plugin-mdx/loaders/mdx-scopes.js
@@ -12,7 +12,7 @@ module.exports = function() {
     files
       .map(
         (file, i) =>
-          `const scope_${i} = require('${slash(
+          `var scope_${i} = require('${slash(
             path.join(abs, file)
           )}').default;`
       )