export type DetectedEncoding = 'utf-8' | 'utf-16le' | 'utf-16be' | 'utf-32le' | 'utf-32be';
/**
 * Detect the text encoding of a buffer by inspecting its BOM (Byte Order Mark).
 * Falls back to 'utf-8' when no BOM is found.
 */
export declare function detectEncoding(buffer: Buffer): DetectedEncoding;
/**
 * Strip the BOM from the start of a string if present.
 */
export declare function stripBom(str: string): string;
/**
 * Returns the byte length of the BOM for a given encoding.
 */
export declare function bomLength(encoding: DetectedEncoding): number;
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