next.js

3c2a1959 - Also enforce experimental features when there's no next config file (#81679)

Also enforce experimental features when there's no next config file (#81679) When running `next build --debug-prerender`, we also want to set the experimental features even if there is no next.config.js file present. This PR also fixes the `cloneObject` function to better handle nested optional object properties, and we're now also freezing and cloning the default config before applying changes to it. > [!NOTE] > This PR is best reviewed with hidden whitespace changes.