source: imaps-frontend/node_modules/es-abstract/2022/IsStringWellFormedUnicode.js

'use strict';

var CodePointAt = require('./CodePointAt');

var $TypeError = require('es-errors/type');

// https://262.ecma-international.org/13.0/#sec-isstringwellformedunicode

module.exports = function IsStringWellFormedUnicode(string) {
        if (typeof string !== 'string') {
                throw new $TypeError('Assertion failed: `string` must be a String');
        }
        var strLen = string.length; // step 1
        var k = 0; // step 2
        while (k !== strLen) { // step 3
                var cp = CodePointAt(string, k); // step 3.a
                if (cp['[[IsUnpairedSurrogate]]']) {
                        return false; // step 3.b
                }
                k += cp['[[CodeUnitCount]]']; // step 3.c
        }
        return true; // step 4
};