feat(lib): add css utility to format style values

src/lib/__tests__/css.spec.js

@@ -0,0 +1,9 @@
+import { css } from '../css';
+
+test('css', () => {
+  expect(css([])).toEqual('');
+  expect(css(['width: 20px; height: 20px;'])).toEqual('width: 20px; height: 20px');
+  expect(css(['width: 20px;', ['height', '20px']])).toEqual('width: 20px; height: 20px');
+  expect(css(['width: 20px', ['height', '20px']])).toEqual('width: 20px; height: 20px');
+  expect(css([undefined, null, 0, ['height', '20px']])).toEqual('height: 20px');
+});

src/lib/css.js

@@ -0,0 +1,16 @@
+function css(array) {
+  return array
+    .map((item, i) => {
+      if (!item) return false;
+
+      return Array.isArray(item)
+        ? item.join(': ')
+        : item.slice(-1) === ';'
+        ? item.slice(0, -1)
+        : item;
+    })
+    .filter(Boolean)
+    .join('; ');
+}
+
+export { css };

src/lib/index.js

@@ -1 +1,2 @@
 export { cx } from './cx';
+export { css } from './css';