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postcss.plugin('plugin-sprite', function (opts) {
    return function (root, result) {

        return new Promise(function (resolve, reject) {
            var sprite = makeSprite();
            fs.writeFile(opts.file, function (err) {
                if ( err ) return reject(err);
                resolve();
            })
        });

    };
});

if ( needPrefix(decl.prop) ) {
    decl.cloneBefore({ prop: '-webkit-' + decl.prop });
}

if ( decl.prop === 'animation' ) {
    var keyframe = createAnimationByName(decl.value);
    keyframes.source = decl.source;
    decl.root().append(keyframes);
}