From f367afc460977b1280bb679031e07e9247e232b5 Mon Sep 17 00:00:00 2001
From: Jackson Tian <shyvo1987@gmail.com>
Date: Tue, 11 Feb 2020 16:44:24 +0800
Subject: [PATCH] Add assertAsMap method

---
 main.tea               |  6 ++++++
 ts/src/client.ts       |  7 +++++++
 ts/test/client.spec.ts | 14 ++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/main.tea b/main.tea
index f3fad8ee..94c32072 100644
--- a/main.tea
+++ b/main.tea
@@ -131,3 +131,9 @@ static function isUnset(value: any): boolean;
  * @return the new stringified map
  */
 static function stringifyMapValue(m: map[string]any): map[string]string;
+
+/**
+ * Assert a value, if it is a map, return it, otherwise throws
+ * @return the map value
+ */
+static function assertAsMap(value: any): map[string]any;
diff --git a/ts/src/client.ts b/ts/src/client.ts
index 689315bd..4004d195 100644
--- a/ts/src/client.ts
+++ b/ts/src/client.ts
@@ -173,4 +173,11 @@ export default class Client {
     }
     return result;
   }
+
+  static assertAsMap(value: any): {[key: string]: any} {
+    if (value && typeof value === 'object' && !Array.isArray(value)) {
+      return value as {[key: string]: any};
+    }
+    throw new Error(`The value is not a object`);
+  }
 }
diff --git a/ts/test/client.spec.ts b/ts/test/client.spec.ts
index d2e5b6ca..1d5eb3fe 100644
--- a/ts/test/client.spec.ts
+++ b/ts/test/client.spec.ts
@@ -116,4 +116,18 @@ describe('Tea Util', function() {
         assert.deepStrictEqual(Client.stringifyMapValue({'bool': true}), {'bool': 'true'});
         assert.deepStrictEqual(Client.stringifyMapValue(null), null);
     });
+
+    it('assertAsMap', function () {
+        assert.deepStrictEqual(Client.assertAsMap({}), {});
+        assert.throws(() => {
+            Client.assertAsMap([]);
+        }, /The value is not a object/);
+        assert.throws(() => {
+            Client.assertAsMap(true);
+        }, /The value is not a object/);
+        assert.throws(() => {
+            Client.assertAsMap(123);
+        }, /The value is not a object/);
+    });
+
 });