/**
 * @file @see https://github.com/parshap/truncate-utf8-bytes
 */
function isHighSurrogate(codePoint) {
    return codePoint >= 0xd800 && codePoint <= 0xdbff;
}
function isLowSurrogate(codePoint) {
    return codePoint >= 0xdc00 && codePoint <= 0xdfff;
}
// Truncate string by size in bytes
function truncate(getLength, character, byteLength) {
    if (typeof character !== 'string') {
        throw new Error('Input must be string');
    }
    const charLength = character.length;
    let curByteLength = 0;
    let codePoint;
    let segment;
    for (let i = 0; i < charLength; i += 1) {
        codePoint = character.charCodeAt(i);
        segment = character[i];
        if (isHighSurrogate(codePoint) && isLowSurrogate(character.charCodeAt(i + 1))) {
            i += 1;
            segment += character[i];
        }
        curByteLength += getLength(segment);
        if (curByteLength === byteLength) {
            return character.slice(0, i + 1);
        }
        else if (curByteLength > byteLength) {
            return character.slice(0, i - segment.length + 1);
        }
    }
    return character;
}
const getLength = Buffer.byteLength.bind(Buffer);
const fromStringToTruncatedUtf8 = truncate.bind(null, getLength);
export { fromStringToTruncatedUtf8 };
export default fromStringToTruncatedUtf8;
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