watcherDefaultTasks.xml

<application>
  <component name="ApplicationTasksOptions">
    <TaskOptions isEnabled="true">
      <option name="arguments" value="--no-cache --update $FileName$:$FileNameWithoutExtension$.css" />
      <option name="checkSyntaxErrors" value="true" />
      <option name="description" value="Compiles .scss files into .css files" />
      <option name="exitCodeBehavior" value="ERROR" />
      <option name="fileExtension" value="scss" />
      <option name="immediateSync" value="true" />
      <option name="name" value="SCSS" />
      <option name="output" value="$FileNameWithoutExtension$.css" />
      <option name="outputFilters">
        <array />
      </option>
      <option name="outputFromStdout" value="false" />
      <option name="program" value="/usr/local/bin/scss" />
      <option name="scopeName" value="Project Files" />
      <option name="trackOnlyRoot" value="true" />
      <option name="workingDir" value="$FileDir$" />
      <envs />
    </TaskOptions>
  </component>
</application>