feat: whitelist some external but expected root config properties

components/validate/ajv/index.mjs

@@ -3,15 +3,17 @@ import Treeify from "treeify";
 import AjvErrorTree from "ajv-error-tree";
 import { schema } from "../../../dist/schema.mjs";
 
-const {ownKeys} = Reflect;
+const { ownKeys } = Reflect;
 const _Map = Map;
 const { asTree } = Treeify;
 
+const expected_extra_properties = ["appmap_dir"];
+
 export default (dependencies) => {
   const {
     util: { hasOwnProperty, assert, coalesce },
     expect: { expect },
-    log: {logGuardInfo},
+    log: { logGuardInfo },
   } = dependencies;
   const naming = new _Map([
     ["config", "configuration"],
@@ -42,14 +44,15 @@ export default (dependencies) => {
     };
   };
   const validateConfig = generateValidate("config");
-  const config_schema = schema.find(({$id}) => $id === "config");
+  const config_schema = schema.find(({ $id }) => $id === "config");
   return {
     validateMessage: generateValidate("message"),
     validateConfig: (config) => {
       validateConfig(config);
       for (const key of ownKeys(config)) {
         logGuardInfo(
-          !hasOwnProperty(config_schema.properties, key),
+          !hasOwnProperty(config_schema.properties, key) &&
+            expected_extra_properties.includes(key),
           "Configuration property not recognized by the agent: %j",
           key,
         );