source: frontend/node_modules/string-width/index.js

'use strict';
const stripAnsi = require('strip-ansi');
const isFullwidthCodePoint = require('is-fullwidth-code-point');
const emojiRegex = require('emoji-regex');

const stringWidth = string => {
        if (typeof string !== 'string' || string.length === 0) {
                return 0;
        }

        string = stripAnsi(string);

        if (string.length === 0) {
                return 0;
        }

        string = string.replace(emojiRegex(), '  ');

        let width = 0;

        for (let i = 0; i < string.length; i++) {
                const code = string.codePointAt(i);

                // Ignore control characters
                if (code <= 0x1F || (code >= 0x7F && code <= 0x9F)) {
                        continue;
                }

                // Ignore combining characters
                if (code >= 0x300 && code <= 0x36F) {
                        continue;
                }

                // Surrogates
                if (code > 0xFFFF) {
                        i++;
                }

                width += isFullwidthCodePoint(code) ? 2 : 1;
        }

        return width;
};

module.exports = stringWidth;
// TODO: remove this in the next major version
module.exports.default = stringWidth;