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

module.exports = str => {

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

str = stripAnsi(str);

let width = 0;

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

};