lib/less/parser/parser.js
function () {
                    var js, index = parserInput.i;

                    parserInput.save();

                    var escape = parserInput.$char('~');
                    var jsQuote = parserInput.$char('`');

                    if (!jsQuote) {
                        parserInput.restore();
                        return;
                    }

                    js = parserInput.$re(/^[^`]*`/);
                    if (js) {
                        parserInput.forget();
                        return new(tree.JavaScript)(js.substr(0, js.length - 1), Boolean(escape), index, fileInfo);
                    }
                    parserInput.restore('invalid javascript definition');
                }
function () {
                    var js, index = parserInput.i;

                    parserInput.save();

                    var escape = parserInput.$char('~');
                    var jsQuote = parserInput.$char('`');

                    if (!jsQuote) {
                        parserInput.restore();
                        return;
                    }

                    js = parserInput.$re(/^[^`]*`/);
                    if (js) {
                        parserInput.forget();
                        return new(tree.JavaScript)(js.substr(0, js.length - 1), Boolean(escape), index, fileInfo);
                    }
                    parserInput.restore('invalid javascript definition');
                }
function ( ) { var js , index = parserInput . i ; parserInput . save ( ) ; var escape = parserInput . $char ( '~' ) ; var jsQuote = parserInput . $char ( '`' ) ; if ( ! jsQuote ) { parserInput . restore ( ) ; return ; } js = parserInput . $re ( / ^[^`]*` / ) ; if ( js ) { parserInput . forget ( ) ; return new ( tree . JavaScript ) ( js . substr ( 0 , js . length - 1 ) , Boolean ( escape ) , index , fileInfo ) ; } parserInput . restore ( 'invalid javascript definition' ) ; }
JavaScript code to be evaluated  `window.location.href`
JavaScript code to be evaluated window . location . href