import type { S3Client } from "@aws-sdk/client-s3";
import type { Adapter } from "../index.js";
export interface BackblazeB2AdapterOptions {
    /** B2 bucket name. The adapter scopes all operations to it. */
    bucket: string;
    /**
     * Backblaze B2 cluster code, e.g. `"us-west-000"`, `"us-west-001"`,
     * `"us-west-002"`, `"us-east-004"`, `"us-east-005"`, `"eu-central-003"`.
     * Drives the endpoint host (`https://s3.<region>.backblazeb2.com`); there's
     * no env-var fallback. Doubles as the SigV4 region. The cluster a bucket
     * lives in is shown in the B2 console; pick the wrong one and you'll see
     * a `301` redirect from B2.
     */
    region: string;
    /**
     * Override the B2 endpoint. When unset, defaults to
     * `https://s3.${region}.backblazeb2.com`. B2 routes by Host header — the
     * SDK prepends the bucket subdomain for virtual-hosted style.
     */
    endpoint?: string;
    /**
     * Static credentials — B2 application key ID. Falls back to
     * `B2_APPLICATION_KEY_ID`; required if that env var isn't set.
     */
    accessKeyId?: string;
    /**
     * Static credentials — B2 application key. Falls back to
     * `B2_APPLICATION_KEY`; required if that env var isn't set.
     */
    secretAccessKey?: string;
    /**
     * Use path-style addressing (`/<bucket>/<key>`) rather than virtual-hosted
     * style. Defaults to `false` — virtual-hosted is canonical for B2.
     */
    forcePathStyle?: boolean;
    /**
     * Origin used to build URLs from `url()`. When set, `url(key)` returns
     * `${publicBaseUrl}/${key}` and skips signing. For public buckets the
     * natural value is the friendly download URL prefix
     * `https://f<NNN>.backblazeb2.com/file/<bucket>` (look it up in the B2
     * console under your bucket → "Endpoint"), or a custom domain proxied
     * through Cloudflare. When unset, `url()` falls back to a presigned
     * GetObject (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 BackblazeB2Adapter = Adapter<S3Client>;
export declare const backblazeB2: (opts: BackblazeB2AdapterOptions) => BackblazeB2Adapter;
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