defaultTheme 
  fun defaultTheme(isInDarkMode: Boolean = isSystemInDarkTheme(), typography: StreamTypography = StreamTypography.defaultTypography(), shapes: StreamShapes = StreamShapes.defaultShapes(), colors: StreamColors = when (isInDarkMode) {
                true -> StreamColors.defaultDarkColors()
                else -> StreamColors.defaultColors()
            }): MessageComposerTheme
Builds the default message composer theme.
Return
A MessageComposerTheme instance holding the default theming.