Debugging unminified build in gatsby v2

[arturhenryy]

Summary

I get an Error Testing my site under ios 10 mobile safari. The problem is that i cannot debug it because the code is minified and the error message does not give me any hint at all.
Is threre anyway to debug the unminified build?

[LekoArts]

Hey Artur,

if you want to have an unminified build + sourcemaps you have to visit the site while running gatsby develop. You can read here how to do it:
#5801

[m-allanson]

There's also the --no-uglify flag, gatsby build --no-uglify should do a full build and skip the minification step.

See https://www.gatsbyjs.org/docs/gatsby-cli/#options-1

[arturhenryy]

@m-allanson thanks i already discovered and used it. it seems the uglification of gatsby caused error in safari 10. do you know if one can tweek the uglifcation settings like this?

    uglify: {
      uglifyOptions: {
        mangle: { safari10: true }
      }
    }
```

[m-allanson]

Fixed in #10536