TueriImageWebp.js

class Img extends React.Component {

    constructor(props) {
        ...
        this.window = typeof window !== 'undefined' && window
        this.isWebpSupported = this.isWebpSupported.bind(this)
    }

    ...
    
    isWebpSupported() {
        if (!this.window.createImageBitmap) {
            return false;
        }
        return true;
    }

    render() {

        ...

        // If a format has not been specified, detect webp support
        // Set the fm (format) option in the image URL
        if (!options['fm'] && this.isWebpSupported) {
            options['fm'] = 'webp'
        }

        ...
        
        return (
            ...
        )

    }
}

...