phpjs/experimental/language/__LINE__.js

php.js offers community built php functions in javascript

function __LINE__(e) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // %        note 1: Not a function in PHP, so in experimental
  // %        note 2: This function depends on the non-standard lineNumber property of Error instances (Mozilla)
  // %        note 3: Also requires 'e' error object to be passed in as an argument, unlike PHP
  // *     example 1: function a () {try {throw new Error();} catch (e) {return __LINE__(e);}}
  // *     example 1: a();
  // *     returns 1: '10'

  return e.lineNumber;
}