style: fix lint errors

Author: andreypopp

src/Syntax.js

@@ -5,7 +5,7 @@
 
 const COMPONENT_RE = /^[a-zA-Z_0-9]+$/;
 
-export function isComponent(node: PostCSSNode) {
+export function isComponent(node) {
   return (
     node.type === 'rule' &&
     COMPONENT_RE.exec(node.selector) &&

src/index.js

@@ -7,7 +7,7 @@ import * as types from 'babel-types';
 import * as postcss from 'postcss';
 import * as LoaderUtils from 'loader-utils';
 import generate from 'babel-generator';
-import transformVariants, {isVariant} from './transformVariants';
+import transformVariants from './transformVariants';
 import HTMLTagList from './HTMLTagList';
 import * as ComponentRef from './ComponentRef';
 import * as Syntax from './Syntax';