[improvement] rename packages dir to src (#3659)

src/row/index.js

@@ -0,0 +1,39 @@
+import { createNamespace } from '../utils';
+
+const [createComponent, bem] = createNamespace('row');
+
+export default createComponent({
+  props: {
+    type: String,
+    align: String,
+    justify: String,
+    tag: {
+      type: String,
+      default: 'div'
+    },
+    gutter: {
+      type: [Number, String],
+      default: 0
+    }
+  },
+
+  render(h) {
+    const { align, justify } = this;
+    const flex = this.type === 'flex';
+    const margin = `-${Number(this.gutter) / 2}px`;
+    const style = this.gutter ? { marginLeft: margin, marginRight: margin } : {};
+
+    return (
+      <this.tag
+        style={style}
+        class={bem({
+          flex,
+          [`align-${align}`]: flex && align,
+          [`justify-${justify}`]: flex && justify
+        })}
+      >
+        {this.slots()}
+      </this.tag>
+    );
+  }
+});