add napi callback snippets

Signed-off-by: chen-zhongwei050 <chenzhongwei050@chinasoftinc.com>

src/vscode_plugin/package.json

@@ -119,6 +119,10 @@
           {
             "language": "cpp",
             "path": "./snippets/napi_promise_snippets.json"
+          },
+          {
+            "language": "cpp",
+            "path": "./snippets/napi_callback_snippets.json"
           }
         ]
     },

src/vscode_plugin/snippets/napi_callback_snippets.json

@@ -0,0 +1,32 @@
+{
+  "Napi Callback": {
+    "prefix": "napicallback",
+    "body": [
+      "static napi_value CallbackSample(napi_env env, napi_callback_info info)",
+      "{",
+      "    // Todo: you can use \"napiobjectin\" command that get object value from js.",
+      "    // Todo: you can use \"napidoublein\" command that get double value from js.",
+      "    // Business code.",
+      "    double myRes = value0 + value1;",
+      "    // Todo: you can use \"napidoubleout\" command that return double to js.",
+      "    napi_value result;",
+      "    // Invokes a js function with the provided arguments and returns the result.",
+      "    napi_call_function(env, nullptr, args[2], 1, &doubleOut, &result);",
+      "    return nullptr;",
+      "}",
+      "EXTERN_C_START",
+      "// Initialize the module.",
+      "static napi_value Init(napi_env env, napi_value exports)",
+      "{",
+      "    // Define properties and methods for a N-API object.",
+      "    napi_property_descriptor desc[] = {",
+      "        { \"callbackSample\", nullptr, CallbackSample, nullptr, nullptr, nullptr, napi_default, nullptr }",
+      "    };",
+      "    // Add an array of properties to a ArkTs object.",
+      "    napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);",
+      "    return exports;",
+      "}",
+      "EXTERN_C_END"
+    ]
+  }
+}