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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;
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