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// https://mathiasbynens.be/notes/javascript-encoding
// https://github.com/bestiejs/punycode.js - punycode.ucs2.decode
export default function ucs2length(str: string): number {
const len = str.length
let length = 0
let pos = 0
let value: number
while (pos < len) {
length++
value = str.charCodeAt(pos++)
if (value >= 0xd800 && value <= 0xdbff && pos < len) {
// high surrogate, and there is a next character
value = str.charCodeAt(pos)
if ((value & 0xfc00) === 0xdc00) pos++ // low surrogate
}
}
return length
}
ucs2length.code = 'require("ajv/dist/runtime/ucs2length").default'