media query expression must begin with '(' in double interpolation

[DzmVasileusky]

node-sass version v4.0.5 (the latest I can get through npm install node-sass -g).

getting error 'media query expression must begin with '(''

$somevariable: '600px';

$viewport-visibility_breakpoints: (
  xs: 'screen and (max-width: '#{$somevariable}')'
);

@media #{map-get($viewport-visibility_breakpoints, xs)} {
  .test {
    display: none;
  }
}

Earlier I used Grunt with grunt-sass and such a code was compiled without any problems.

[DzmVasileusky]

Well, I overcame the issue with spaces between strings and interpolations:

$somevariable: '600px';

$viewport-visibility_breakpoints: (
  xs: 'screen and (max-width: ' #{$somevariable} ')'
);

@media #{map-get($viewport-visibility_breakpoints, xs)} {
  .test {
    display: none;
  }
}