/**
 * Populate a local JSR instance with packages from an upstream registry
 */
export declare function populateFromUpstream(params: {
    /**
     * URL of the upstream registry
     *
     * @default  "https://jsr.io"
     */
    upstream?: string;
    /**
     * URL of the downstream local registry
     */
    downstream: string;
    /**
     * List of packages to populate (in format: `@scope/name@version`, e.g. `@std/fs@0.105.0`)
     */
    packages: string[];
    /**
     * Optional token for authentication (will be passed as `-t` to `deno publish`). Useful for CI/CD.
     */
    token?: string;
    /**
     * Whether to create packages via the API instead of interactively via web UI. Useful for CI/CD.
     *
     * Requires {@link token} to be set.
     */
    createViaApi?: boolean;
    /**
     * Deno executable path
     *
     * @default "deno" (from PATH)
     */
    deno?: string;
    /**
     * Whether to suppress output
     *
     * @default false
     */
    quiet?: boolean;
    /**
     * Additional arguments to pass to `deno publish`
     */
    publishArgs?: string[] | ((pkg: string) => string[]);
}): Promise<void>;