export declare class BorshWriter {
    private buffer;
    writeU8(value: number): void;
    writeU16(value: number): void;
    writeU32(value: number): void;
    writeU64(value: bigint): void;
    writeF32(value: number): void;
    writeF64(value: number): void;
    writeFixedArray(bytes: Uint8Array): void;
    writeBytes(bytes: Uint8Array): void;
    writeVec<T>(items: T[], writeFn: (item: T) => void): void;
    writeString(str: string): void;
    writeOption<T>(value: T | null | undefined, writeFn: (item: T) => void): void;
    toBytes(): Uint8Array;
    size(): number;
}
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