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has-ansi 
Check if a string has ANSI escape codes
Install
$ npm install --save has-ansi
Usage
var hasAnsi = require('has-ansi');
hasAnsi('\u001b[4mcake\u001b[0m');
//=> true
hasAnsi('cake');
//=> false
Related
- has-ansi-cli - CLI for this module
- strip-ansi - Strip ANSI escape codes
- ansi-regex - Regular expression for matching ANSI escape codes
- chalk - Terminal string styling done right
License
MIT © Sindre Sorhus