next.config.mjs

import locales from './src/const/locales.mjs';
import svgr from 'next-plugin-svgr';
import withPlugins from 'next-compose-plugins';
import images from 'next-images';
import { globby } from 'globby';
import { join, relative } from 'path';
import { withNextBanner } from 'next-banner';

export const defaultLocale = 'en';

export const nextConfig = {
    trailingSlash: true,
    i18n: {
        locales,
        defaultLocale,
    },
    experimental: {
        outputStandalone: true,

        // this is to prevent translation API key from getting rate limited
        // this does mean the non-translated pages build slower, but eh.
        cpus: 1,
        workerThreads: false,
    },
    async headers() {
        // https://stackoverflow.com/questions/62077589/setting-cache-control-header-for-static-file-serving-on-nextjs-default-server
        return [
            {
                source: '/:all*(svg|jpg|png)',
                locale: false,
                headers: [
                    {
                        key: 'Cache-Control',
                        value: 'public, max-age=7200, must-revalidate',
                    },
                ],
            },
            {
                source: '/:all*(json)',
                locale: false,
                headers: [
                    {
                        key: 'Cache-Control',
                        value: 'max-age=31536000, public, stale-while-revalidate',
                    },
                ],
            },
        ];
    },
    async redirects() {
        // Redirects public files that were accidentally prefixed with a locale.
        const paths = await globby('./public/**/*', { expandDirectories: false });
        return locales.flatMap((locale) =>
            locale !== defaultLocale
                ? paths.map((path) => {
                      const relativePath = join('/', relative('./public', path));
                      return {
                          source: `/${locale}${relativePath}`,
                          destination: relativePath,
                          permanent: false,
                          locale: false,
                      };
                  })
                : []
        );
    },
};

export default withPlugins(
    [
        [
            withNextBanner,
            {
                nextBanner: {
                    domain: 'https://plutonium.pw',
                },
            },
        ],
        svgr,
        [images, { fileExtensions: ['jpg', 'jpeg', 'png', 'gif'] }],
    ],
    nextConfig
);