@vis.gl/react-mapbox/dist/utils/compare-class-names.js

React components for Mapbox GL JS

/** Compare two classNames string and return the difference */
export function compareClassNames(prevClassName, nextClassName) {
    if (prevClassName === nextClassName) {
        return null;
    }
    const prevClassList = getClassList(prevClassName);
    const nextClassList = getClassList(nextClassName);
    const diff = [];
    for (const c of nextClassList) {
        if (!prevClassList.has(c)) {
            diff.push(c);
        }
    }
    for (const c of prevClassList) {
        if (!nextClassList.has(c)) {
            diff.push(c);
        }
    }
    return diff.length === 0 ? null : diff;
}
function getClassList(className) {
    return new Set(className ? className.trim().split(/\s+/) : []);
}
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