Css Properties and TextStyle Types

I have a textStyle which is a type of TextStyle (it comes from react-native types) or React.CSSProperties. I want to pass this type to style attribute for html span element. style attribute accepts type of React.CSSProperties. My interface and span element is:

export interface IBaseTextStyleType {    textStyle:  React.CSSProperties | TextStyle}<span style={style.textStyle}>    {this.props.children || this.props.text}</span>

I got this error in style of span:

Type 'CSSProperties | TextStyle' is not assignable to type 'CSSProperties'.  Type 'TextStyle' is not assignable to type 'CSSProperties'.    Types of property 'aspectRatio' are incompatible.      Type 'number' is not assignable to type 'AspectRatio'.

How can I rid of this error ?