fix: keep NODE_ENV set by users

[GMartigny]

Don't override the NODE_ENV if it's already set.

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

When runnnig storybook, I need to use special setting in my nuxt.config.js. I tried to set NODE_ENV to any value (storybook for example), but the module would always override it.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

I think this should be the default behavior and would not require test or documentation.

[farnabaz]

Thanks ❤️