Erster Commit

2026-08-22 08:40:29 +02:00
commit 875477d425
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+"use strict";
+// Copyright 2021-2024 Buf Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.isMessage = void 0;
+const message_js_1 = require("./message.js");
+/**
+ * Check whether the given object is any subtype of Message or is a specific
+ * Message by passing the type.
+ *
+ * Just like `instanceof`, `isMessage` narrows the type. The advantage of
+ * `isMessage` is that it compares identity by the message type name, not by
+ * class identity. This makes it robust against the dual package hazard and
+ * similar situations, where the same message is duplicated.
+ *
+ * This function is _mostly_ equivalent to the `instanceof` operator. For
+ * example, `isMessage(foo, MyMessage)` is the same as `foo instanceof MyMessage`,
+ * and `isMessage(foo)` is the same as `foo instanceof Message`. In most cases,
+ * `isMessage` should be preferred over `instanceof`.
+ *
+ * However, due to the fact that `isMessage` does not use class identity, there
+ * are subtle differences between this function and `instanceof`. Notably,
+ * calling `isMessage` on an explicit type of Message will return false.
+ */
+function isMessage(arg, type) {
+    if (arg === null || typeof arg != "object") {
+        return false;
+    }
+    if (!Object.getOwnPropertyNames(message_js_1.Message.prototype).every((m) => m in arg && typeof arg[m] == "function")) {
+        return false;
+    }
+    const actualType = arg.getType();
+    if (actualType === null ||
+        typeof actualType != "function" ||
+        !("typeName" in actualType) ||
+        typeof actualType.typeName != "string") {
+        return false;
+    }
+    return type === undefined ? true : actualType.typeName == type.typeName;
+}
+exports.isMessage = isMessage;