/**
 * Count UTF-8 bytes without allocating an encoded copy of a potentially large
 * string. Lone surrogates match TextEncoder's U+FFFD replacement behavior.
 *
 * When `stopAfter` is provided, the function returns `stopAfter + 1` as soon
 * as the boundary is exceeded.
 */
export declare function utf8ByteLength(value: string, stopAfter?: number): number;
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