1. @DomName('WebGLRenderingContext.stencilFuncSeparate')
  2. @DocsEditable()
void stencilFuncSeparate(int face, int func, int ref, int mask)

Source 

@DomName('WebGLRenderingContext.stencilFuncSeparate')
@DocsEditable()
void stencilFuncSeparate(int face, int func, int ref, int mask) =>
    _blink.BlinkWebGLRenderingContext.instance
        .stencilFuncSeparate_Callback_4_(this, face, func, ref, mask);