feat(mergeProps): add mergeProps function

src/index.ts

@@ -7,3 +7,4 @@ export { default as set, merge, mergeWith } from './utils/set';
 export { default as warning, noteOnce } from './warning';
 export { default as omit } from './omit';
 export { default as toArray } from './Children/toArray';
+export { default as mergeProps } from './mergeProps';

src/mergeProps.tsx

@@ -0,0 +1,18 @@
+function mergeProps<A, B>(a: A, b: B): B & A;
+function mergeProps<A, B, C>(a: A, b: B, c: C): C & B & A;
+function mergeProps<A, B, C, D>(a: A, b: B, c: C, d: D): D & C & B & A;
+function mergeProps(...items: any[]) {
+  const ret: any = {};
+  items.forEach(item => {
+    if (item) {
+      Object.keys(item).forEach(key => {
+        if (item[key] !== undefined) {
+          ret[key] = item[key];
+        }
+      });
+    }
+  });
+  return ret;
+}
+
+export default mergeProps;