function extractFromStyleVariablesContext(ctx) {
    const references = []
    for (const { id } of ctx.references) {
      references.push(
        extractFromName(id.name, id, () => extractFromExpression(id, true))
      )
    }
    return mergePropertyReferences(references)
  }
Extract the property references from StyleVariablesContext.
@param {StyleVariablesContext} ctx
@returns {IPropertyReferences}