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widest-line 
Get the visual width of the widest line in a string - the number of columns required to display it
Some Unicode characters are fullwidth and use double the normal width. ANSI escape codes are stripped and doesn't affect the width.
Useful to be able to know the maximum width a string will take up in the terminal.
Install
$ npm install widest-line
Usage
const widestLine = require('widest-line');
widestLine('古\n\u001B[1m@\u001B[22m');
//=> 2
Related
- string-width - Get the visual width of a string
License
MIT © Sindre Sorhus