import font in style sheet

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1

how can i import custem font in this style sheet ??

import * as Consts from “./constants/styleConstants”;
import { StyleSheet } from “react-native”;

const stylesBase = StyleSheet.create({
text: {
fontSize: 13,
color: Consts.colorDark2,
lineHeight: 19
},
h1: {

fontSize: 30,
fontWeight: "bold",
color: Consts.colorDark1

},
h2: {

fontSize: 26,
fontWeight: "bold",
color: Consts.colorDark1

},
h3: {

fontSize: 22,
fontWeight: "bold",
color: Consts.colorDark1

},
h4: {

fontSize: 18,
fontWeight: "bold",
color: Consts.colorDark1

},
h5: {

fontSize: 15,
fontWeight: "bold",
color: Consts.colorDark1

},
h6: {
fontSize: 13,
fontWeight: “bold”,
color: Consts.colorDark1
},
});
export default stylesBase;