message: refactor(core): remove truthy check for classes getter
  Remove the truthy check for the classes getter as both paths from the check assume className was not
  undefined.  This allows for typescript to properly determine the type of `className` in the falsy path
  from the truthy check.
  PR Close
diff: @@ -495,8 +495,8 @@ class DebugElement__POST_R3__ extends DebugNode__POST_R3__ implements DebugEleme
  // SVG elements return an `SVGAnimatedString` instead of a plain string for the `className`.
  const className = element.className as string | SVGAnimatedString;
  - const classes = className && typeof className !== 'string' ? className.baseVal.split(' ') :
  - className.split(' ');
  + const classes =
  + typeof className !== 'string' ? className.baseVal.split(' ') : className.split(' ');
  classes.forEach((value: string) => result[value] = true);
  