next.config.js

const i18Config = require("./next-i18next.config")

const config = {
  /** typesense-instantsearch-adapter 3.x ships ESM syntax in .js files whose
   * package main is not marked "type": "module", so Next's default server
   * externalization require()s it and node fails on its extensionless relative
   * imports — 500ing every search page. Transpiling bundles it instead.
   */
  transpilePackages: ["typesense-instantsearch-adapter"],
  images: {
    loader: "custom"
  },
  compiler: {
    styledComponents: true
  },
  eslint: {
    dirs: ["pages", "components", "functions/src", "tests", "analysis"]
  },
  i18n: i18Config.i18n
}

/** @type {import('next').NextConfig} */
module.exports = {
  ...config,
  async redirects() {
    return [
      redirectFirebaseAuthHandlers(),
      // Three of the four old Learn testimony tabs were consolidated into
      // /learn/testimony. These slugs were linked from the footer and from
      // external sites, so they redirect permanently rather than 404. Each tab
      // became a section of the new page and keeps its old slug as an anchor id
      // (see ANCHORS in components/learn/Testimony/AboutTestimony.tsx), so the
      // reader lands on the content that replaced the page they asked for
      // rather than at the top. "testimony-basics" was the overview tab, which
      // the whole page now covers, so it has no anchor.
      ...[
        "testimony-basics",
        "role-of-testimony",
        "communicating-with-legislators"
      ].map(slug => ({
        source: `/learn/${slug}`,
        destination:
          slug === "testimony-basics"
            ? "/learn/testimony"
            : `/learn/testimony#${slug}`,
        permanent: true
      }))
    ]
  },
  async rewrites() {
    const rewrites = [
      {
        source: "/policies",
        destination: "/policies/privacy-policy"
      }
    ]
    if (process.env.MCP_PROXY_URL) {
      rewrites.push({
        source: "/api/mcp/:path*",
        destination: `${process.env.MCP_PROXY_URL}/:path*`
      })
    }
    return rewrites
  }
}

/**
 * Redirect auth handler paths to the hosted firebase pages. This avoids having
 * to implement these pages ourselves in next.js but continues to depend on
 * firebase hosting a bit.
 *b
 * In production, FIREBASE_AUTH_DOMAIN is set to digital-testimony-prod.web.app.
 *
 * @see https://firebase.google.com/docs/auth/custom-email-handler
 */
const redirectFirebaseAuthHandlers = () => {
  const firebaseDomain =
    process.env.FIREBASE_AUTH_DOMAIN ?? "digital-testimony-dev.web.app"

  return {
    source: "/__/:path*",
    destination: `https://${firebaseDomain}/__/:path*`,
    permanent: false
  }
}