[SOLVED] uglify Invalid hex-character pattern in string

uglify Invalid hex-character pattern in string

Here is my code:

var xxx = '\u{1F393}'

When I use gulp-uglify, I get the following error message:

'Invalid hex-character pattern in string'

Solution

Unfortunately, it appears that your gulp-uglify doesn't support unicode point escapes. For this emoji, you could write it as its functionally identical surrogate pair \ud83c\udf93.

console.log('\u{1F393}');
console.log('\ud83c\udf93');

Here is a simple script to help you convert out the emoji's into their surrogate pairs:

const str = '🎓';
const str2 = '\u{1F393}';

function getEscaped(str) {
  var ret = '';
  for (var i=0; i<str.length; i++) {
    var code = str.charCodeAt(i).toString(16);

    ret += '\\u' + code;
  }
  
  return ret;
}

const result = getEscaped(str);
console.log(result);
console.log(eval(`"${result}"`));
console.log(getEscaped(str2));