STREAMS-1972: Replace assert (#20)

Author: LijieZhang1998

snippets/mongocompat/mongotypes.js

@@ -757,7 +757,9 @@ tojsonObject = function(x, indent, nolint, depth) {
     }
     var lineEnding = nolint ? " " : "\n";
     var tabSpace = nolint ? "" : "\t";
-    assert.eq((typeof x), "object", "tojsonObject needs object, not [" + (typeof x) + "]");
+    if (typeof x !== "object") {
+        throw new TypeError(`tojsonObject needs object, not [${typeof x}]`);
+    }
 
     if (!indent)
         indent = "";

snippets/mongocompat/test.js

@@ -97,3 +97,19 @@ dbRefForSetters.$db = 'newDb';
 assert.strictEqual(dbRefForSetters.$db, 'newDb');
 assert.strictEqual(dbRefForSetters.db, 'newDb');
 assert.strictEqual(dbRefForSetters.toString(), 'DBRef("newColl", ObjectId("507f1f77bcf86cd799439011"), "newDb")');
+
+try {
+    tojsonObject("not an object");
+    assert.fail('Should throw TypeError for string');
+} catch (e) {
+    assert(e instanceof TypeError);
+    assert(e.message.includes('tojsonObject needs object, not [string]'));
+}
+try {
+    tojsonObject(true);
+    assert.fail('Should throw TypeError for boolean');
+} catch (e) {
+    assert(e.message.includes('tojsonObject needs object, not [boolean]'));
+}
+assert.strictEqual(typeof tojsonObject({ key: "value" }), 'string');
+assert.strictEqual(typeof tojsonObject([1, 2, 3]), 'string');