feat(Tabbar): add before-change prop (#7081)

src/utils/interceptor.ts

@@ -0,0 +1,27 @@
+import { isPromise, noop } from '.';
+
+export function callInterceptor(options: {
+  interceptor?: (...args: any[]) => Promise<boolean> | boolean;
+  done: () => void;
+  args: any[];
+}) {
+  const { interceptor, args, done } = options;
+
+  if (interceptor) {
+    const returnVal = interceptor(...args);
+
+    if (isPromise(returnVal)) {
+      returnVal
+        .then((value) => {
+          if (value) {
+            done();
+          }
+        })
+        .catch(noop);
+    } else if (returnVal) {
+      done();
+    }
+  } else {
+    done();
+  }
+}

src/utils/test/interceptor.spec.js

@@ -0,0 +1,50 @@
+import { later } from '../../../test';
+import { callInterceptor } from '../interceptor';
+
+test('#callInterceptor', async () => {
+  const done = jest.fn();
+  callInterceptor({ done });
+  expect(done).toHaveBeenCalledTimes(1);
+
+  callInterceptor({
+    interceptor: () => false,
+    done,
+  });
+  expect(done).toHaveBeenCalledTimes(1);
+
+  callInterceptor({
+    interceptor: () => true,
+    done,
+  });
+  expect(done).toHaveBeenCalledTimes(2);
+
+  callInterceptor({
+    interceptor: () => Promise.resolve(false),
+    done,
+  });
+  await later();
+  expect(done).toHaveBeenCalledTimes(2);
+
+  callInterceptor({
+    interceptor: () => Promise.resolve(true),
+    done,
+  });
+  await later();
+  expect(done).toHaveBeenCalledTimes(3);
+
+  callInterceptor({
+    interceptor: () => Promise.reject(),
+    done,
+  });
+  await later();
+  expect(done).toHaveBeenCalledTimes(3);
+
+  callInterceptor({
+    interceptor: (...args) => {
+      expect(args).toEqual(['foo']);
+    },
+    args: ['foo'],
+    done,
+  });
+  expect(done).toHaveBeenCalledTimes(3);
+});