import type { BuildOptions } from "@opennextjs/aws/build/helper.js";
/**
 * Extracts the environment variables defined in various .env files for a project.
 *
 * The `NEXTJS_ENV` environment variable in `.dev.vars` determines the mode.
 *
 * Merged variables respect the following priority order.
 * 1. `.env.{mode}.local`
 * 2. `.env.local` (when mode is not equal to `test`)
 * 3. `.env.{mode}`
 * 4. `.env`
 *
 * https://nextjs.org/docs/pages/building-your-application/configuring/environment-variables#environment-variable-load-order
 *
 * In a monorepo, the env files in an app's directory will take precedence over
 * the env files at the root of the monorepo.
 */
export declare function extractProjectEnvVars(mode: string, { monorepoRoot, appPath }: BuildOptions): Record<string, string>;