.env.local.production -

Now, any variables in .env.local.production will take precedence over .env.production .

Thus, .env.local.production (which is the same as .env.production.local ) is in production mode. .env.local.production

If you rely on .env.local.production and then migrate frameworks, your build will silently fail to load configuration. Now, any variables in

GENERATE_SOURCEMAP=true # Override to debug bundled code LOG_LEVEL=debug # See everything during local build .env.local.production

: You can use the # symbol to add comments or disable specific lines.