next 7 does't work properly on every safari 10

[sl5310]

I have iPhone 5c and iPhone 6 both are iOS 10 and just upgrade my project to next 7 recently.
iPhone 5c was getting error when access to our project
SyntaxError: Cannot declare a let variable twice: 'l'.
already added mangle option eg:
new UglifyJSPlugin({ uglifyOptions: { compress: { drop_console: true }, mangle: { safari10: true } } })
But the problem still existed

System information

• OS: iOS 10
• Browser (if applies): Safari & Google Chrome
• Version of Next.js: 7

[ilionic]

you need to pass it to config.optimization.minimizer
Our example ( but using TerserPlugin instead of UglifyJSPlugin )

        if (!isServer && !dev) {
          config.optimization.minimizer = [
            new TerserPlugin({
              parallel: true,
              cache: true,
              sourceMap: true,
              terserOptions: {
                safari10: true,
              },
            }),
          ];
        }

[teleginzhenya]

@timneutkens can I work on this issue? Should it works as option flag or add safari10: true for all cases?

[timneutkens]

Yes @teleginzhenya