export interface DecodedBinaryString {
    bytes: Uint8Array;
    mime?: string;
    encoding: 'base64' | 'data-url';
}
/** Encode bytes as unprefixed base64 for storage or an enclosing data URL. */
export declare function encodeBytesAsBase64(bytes: Uint8Array): string;
/** Encode bytes as the JSON wire representation for a binary protocol field. */
export declare function encodeBytesAsDataUrl(bytes: Uint8Array, mime?: string): string;
/** Decode an unprefixed base64 string or base64 data URL into semantic bytes. */
export declare function decodeBinaryString(value: string): DecodedBinaryString;
/** Whether a string is a valid unprefixed base64 value or base64 data URL. */
export declare function isEncodedBinaryString(value: string): boolean;
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