/**
 * @license
 * Copyright Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/**
 * Wraps URL.createObjectURL, checking the safety of the source. For blobs, the
 * function validates that the Blob's type is amongst the safe MIME types, and
 * throws if that's not the case. URL.revokeObjectURL should be called on the
 * returned URL to free the resources.
 */
export declare function objectUrlFromSafeSource(source: Blob | MediaSource): string;