/**
 * GitHub asset-byte fetcher for the pointer-only install path.
 *
 * Given an upstream repo URL and a pinned commit SHA, walks the recursive
 * git tree at that commit and fetches the blob bytes for each requested path.
 * The Catalog never serves asset bytes — it only hands clients the Pointer
 * Triple (`source.url` + `source.commitSha` + per-file `{path, sha256}`),
 * and `installFromManifest` verifies every byte against those hashes.
 *
 * Authentication: an optional GitHub PAT is read from the `SKAILE_GITHUB_PAT`
 * environment variable when no `octokit` instance is injected. Public repos
 * work unauthenticated (subject to GitHub's anonymous rate limit).
 *
 * @docLink packages/library/concepts#install
 */
import { Octokit } from "@octokit/rest";
/** GitHub PAT environment variable used when no Octokit is injected. */
export declare const GITHUB_PAT_ENV = "SKAILE_GITHUB_PAT";
/**
 * Options for {@link fetchAssetFilesFromGitHub}.
 */
export interface FetchOpts {
    /** Upstream repo URL (e.g. `https://github.com/skaile-ai/skaile-ai-assets`). */
    url: string;
    /** Immutable 40-char git commit SHA the asset version was pinned at. */
    commitSha: string;
    /** Repo-relative paths to fetch. */
    paths: string[];
    /** Optional Octokit instance — injectable for tests. */
    octokit?: Octokit;
}
/**
 * Fetch the bytes of each requested path from a GitHub repo at a pinned commit.
 *
 * Reads the recursive git tree at `commitSha`, maps each blob path to its blob
 * SHA, then fetches each requested path's blob and base64-decodes it.
 *
 * @returns A `{ path → Buffer }` map covering every requested path.
 * @throws An error whose message matches `/unreachable/i` if the tree cannot
 *   be read or any requested path is absent from the tree.
 */
export declare function fetchAssetFilesFromGitHub(opts: FetchOpts): Promise<Record<string, Buffer>>;
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