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'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;