node_modules/roboto-fontface/css/mixins.less

@roboto-font-path: '../../../fonts';

.roboto-font(@folder, @variant, @type, @weight, @style) {

    @font-full-path: '@{roboto-font-path}/@{folder}/@{variant}';

    @font-face {
        font-family: '@{variant}';
        src: url('@{font-full-path}-@{type}.woff2') format('woff2'),
             url('@{font-full-path}-@{type}.woff') format('woff');
        font-weight: @weight;
        font-style: @style;
    }

    @font-face {
        font-family: '@{variant}-@{type}';
        src: url('@{font-full-path}-@{type}.woff2') format('woff2'),
             url('@{font-full-path}-@{type}.woff') format('woff');
    }
}