Answers for "image component in react native has no width and height"

full width of image and maintain aspect ratio react native

render() {
    let image = this.props.requireSource;
    const { width, height } = Image.resolveAssetSource(image);
    const ratio = height / width;
    const SCREEN_WIDTH = Dimensions.get('window').width;

    return (
        <Image source={image} style={{width: SCREEN_WIDTH, height: SCREEN_WIDTH*ratio}} resizeMode="contain"/>
    );
}

react native asign width to image

First import Dimensions from react-native

import { Dimensions } from 'react-native';
then you have to get the dimensions of the window

const win = Dimensions.get('window');
Now calculate ratio as

const ratio = win.width/541; //541 is actual image width
now the add style to your image as

imageStyle: {
    width: win.width,
    height: 362 * ratio, //362 is actual height of image
}