import { Transform } from 'stream';
export declare const BOM_SIGNATURES: {
    readonly 'utf-8': Buffer<ArrayBuffer>;
    readonly 'utf-16le': Buffer<ArrayBuffer>;
    readonly 'utf-16be': Buffer<ArrayBuffer>;
    readonly 'utf-32le': Buffer<ArrayBuffer>;
    readonly 'utf-32be': Buffer<ArrayBuffer>;
};
export type Encoding = keyof typeof BOM_SIGNATURES;
export interface BomDetectionResult {
    encoding: Encoding;
    bomLength: number;
    hasBom: boolean;
}
export interface ReadFileWithBomResult {
    data: Buffer | string;
    encoding: string;
    hadBom: boolean;
    bomInfo: BomDetectionResult | null;
}
export interface NormalizeCsvInputOptions {
    encoding?: string;
    normalizeLineEndings?: boolean;
}
export declare function detectBom(input: Buffer | string | null | undefined): BomDetectionResult | null;
export declare function stripBom(input: Buffer | string | null | undefined): Buffer | string;
export declare function stripBomFromString(str: string): string;
export declare function createBomStripStream(): Transform;
export declare function readFileWithBomHandling(filePath: string, options?: {
    encoding?: BufferEncoding;
}): Promise<ReadFileWithBomResult>;
export declare function fileHasBomSync(filePath: string): BomDetectionResult | null;
export declare function normalizeCsvInput(csvInput: string | Buffer, options?: NormalizeCsvInputOptions): string;
export declare function normalizeCsvInputAsync(csvInput: string | Buffer | {
    filePath: string;
}, options?: NormalizeCsvInputOptions): Promise<string>;
export declare function createBomStrippingIterator(stream: NodeJS.ReadableStream): AsyncIterableIterator<Buffer>;
export declare function detectBomAsync(filePath: string): Promise<BomDetectionResult | null>;
declare const _default: {
    detectBom: typeof detectBom;
    stripBom: typeof stripBom;
    stripBomFromString: typeof stripBomFromString;
    createBomStripStream: typeof createBomStripStream;
    readFileWithBomHandling: typeof readFileWithBomHandling;
    fileHasBomSync: typeof fileHasBomSync;
    normalizeCsvInput: typeof normalizeCsvInput;
    normalizeCsvInputAsync: typeof normalizeCsvInputAsync;
    createBomStrippingIterator: typeof createBomStrippingIterator;
    detectBomAsync: typeof detectBomAsync;
    BOM_SIGNATURES: {
        readonly 'utf-8': Buffer<ArrayBuffer>;
        readonly 'utf-16le': Buffer<ArrayBuffer>;
        readonly 'utf-16be': Buffer<ArrayBuffer>;
        readonly 'utf-32le': Buffer<ArrayBuffer>;
        readonly 'utf-32be': Buffer<ArrayBuffer>;
    };
};
export default _default;