Add JS_IsTypedArray()

Unlike JS_GetTypedArrayBuffer() it does not throw an exception if
`val` is not a typed array.

Author: xeioex

quickjs.c

@@ -53439,6 +53439,20 @@ JSValue JS_NewTypedArray(JSContext *ctx, int argc, JSValueConst *argv,
                                       JS_CLASS_UINT8C_ARRAY + type);
 }
 
+/* return -1 if exception (proxy case) or TRUE/FALSE */
+int JS_IsTypedArray(JSContext *ctx, JSValueConst val)
+{
+    JSObject *p;
+
+    if (js_resolve_proxy(ctx, &val, TRUE))
+        return -1;
+    if (JS_VALUE_GET_TAG(val) != JS_TAG_OBJECT)
+        return FALSE;
+    p = JS_VALUE_GET_OBJ(val);
+    return p->class_id >= JS_CLASS_UINT8C_ARRAY &&
+           p->class_id <= JS_CLASS_FLOAT64_ARRAY;
+}
+
 /* Return the buffer associated to the typed array or an exception if
    it is not a typed array or if the buffer is detached. pbyte_offset,
    pbyte_length or pbytes_per_element can be NULL. */

quickjs.h

@@ -847,6 +847,7 @@ typedef enum JSTypedArrayEnum {
 
 JSValue JS_NewTypedArray(JSContext *ctx, int argc, JSValueConst *argv,
                          JSTypedArrayEnum array_type);
+int JS_IsTypedArray(JSContext *ctx, JSValueConst val);
 JSValue JS_GetTypedArrayBuffer(JSContext *ctx, JSValueConst obj,
                                size_t *pbyte_offset,
                                size_t *pbyte_length,