Function betterAuthInstaller

cli/src/installers/betterAuth.ts:9–134

({
  projectDir,
  packages,
  databaseProvider,
  appRouter,
})

import { addPackageDependency } from "~/utils/addPackageDependency.js";

export const betterAuthInstaller: Installer = ({
  projectDir,
  packages,
  databaseProvider,
  appRouter,
}) => {
  const usingPrisma = packages?.prisma.inUse;
  const usingDrizzle = packages?.drizzle.inUse;

  const deps: AvailableDependencies[] = ["better-auth"];
  if (usingPrisma) deps.push("@auth/prisma-adapter");
  if (usingDrizzle) deps.push("@auth/drizzle-adapter");

  addPackageDependency({
    projectDir,
    dependencies: deps,
    devMode: false,
  });

  const extrasDir = path.join(PKG_ROOT, "template/extras");

  const isAppRouter = appRouter ?? true; // Default to app router if not specified

  const apiHandlerFile = isAppRouter
    ? "src/app/api/auth/[...all]/route.ts"
    : "src/pages/api/auth/[...all].ts";

  const apiHandlerSrc = path.join(extrasDir, apiHandlerFile);
  const apiHandlerDest = path.join(projectDir, apiHandlerFile);

  const authConfigSrc = path.join(
    extrasDir,
    "src/server/better-auth/config",
    usingPrisma
      ? "with-prisma.ts"
      : usingDrizzle
        ? "with-drizzle.ts"
        : "base.ts"
  );
  const authConfigDest = path.join(
    projectDir,
    "src/server/better-auth/config.ts"
  );

  const authIndexSrc = path.join(extrasDir, "src/server/better-auth/index.ts");
  const authIndexDest = path.join(
    projectDir,
    "src/server/better-auth/index.ts"
  );

  // Better Auth client and server helpers
  const betterAuthClientSrc = path.join(
    extrasDir,
    "src/server/better-auth/client.ts"
  );
  const betterAuthClientDest = path.join(
    projectDir,
    "src/server/better-auth/client.ts"