GSS migration: mixin definition for a transition with multiple transition-property

Hello,

I am currently migrating a GWT project to use new GSS features. But I am struggling in finding a mixin definition for a transition with multiple transition property.

Old CSS code before GWT 2.7 was:

.class {
  transition: literal("opacity .5s linear 0s, visibility 0s linear .5s");
  -webkit-transition: literal("opacity .5s linear 0s, visibility 0s linear .5s");
}

Now I want to use a mixin for that:

@defmixin transitions(TRANSITIONS) {
  -webkit-transition: TRANSITIONS;
  -moz-transition: TRANSITIONS;
  transition: TRANSITIONS;
}

.class {
  @mixin transitions(opacity .5s linear 0s, visibility 0s linear .5s);
}

Not surprisingly the code cannot be compiled. The error message is "The number of arguments of the mixin and the corresponding definition are different". I tried to escape the comma with an unicode sequence but with no success.

So how I can perform a successful migration of the old code?

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