import type { S3Client } from "@aws-sdk/client-s3";
import type { Adapter } from "../index.js";
export interface NeonAdapterOptions {
    /** Neon object-storage bucket name. The adapter scopes all operations to it. */
    bucket: string;
    /**
     * The branch's S3-compatible endpoint URL. Falls back to
     * `AWS_ENDPOINT_URL_S3` — the variable `neon dev` / `neon env pull` inject
     * for the linked branch. Required if that env var isn't set.
     */
    endpoint?: string;
    /**
     * SigV4 region used for signing. Falls back to `AWS_REGION`, then
     * `NEON_STORAGE_REGION` (Neon injects the region under both names), then
     * defaults to `"us-east-1"`. Neon normalizes the region server-side and does
     * not use it for routing, but the signature requires *some* value.
     */
    region?: string;
    /**
     * Static access key ID. Skip to use the AWS credential chain, which reads
     * the `AWS_ACCESS_KEY_ID` that `neon dev` / `neon env pull` inject for the
     * branch credential.
     */
    accessKeyId?: string;
    /**
     * Static secret access key. Skip to use the AWS credential chain, which
     * reads the `AWS_SECRET_ACCESS_KEY` Neon injects for the branch credential.
     */
    secretAccessKey?: string;
    /**
     * Origin used to build URLs from `url()`. When set, `url(key)` returns
     * `${publicBaseUrl}/${key}` and skips signing — appropriate for a bucket
     * fronted by a CDN or custom domain. When unset, `url()` falls back to a
     * presigned `GetObject` URL (default expiry: 1 hour).
     */
    publicBaseUrl?: string;
    /**
     * Default expiry, in seconds, for the presigned URLs returned by `url()`
     * when `publicBaseUrl` is not set. Defaults to 3600 (1 hour).
     */
    defaultUrlExpiresIn?: number;
}
export type NeonAdapter = Adapter<S3Client> & {
    readonly bucket: string;
};
export declare const neon: (opts: NeonAdapterOptions) => NeonAdapter;
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