Calculate hidden configuration keys using package.json

extensions/ql-vscode/src/config.ts

@@ -10,14 +10,21 @@ export const ALL_SETTINGS: Setting[] = [];
 export class Setting {
   name: string;
   parent?: Setting;
+  private _hasChildren = false;
 
-  constructor(name: string, parent?: Setting, public readonly isHidden = false) {
+  constructor(name: string, parent?: Setting) {
     this.name = name;
     this.parent = parent;
-
+    if (parent !== undefined) {
+      parent._hasChildren = true;
+    }
     ALL_SETTINGS.push(this);
   }
 
+  get hasChildren() {
+    return this._hasChildren;
+  }
+
   get qualifiedName(): string {
     if (this.parent === undefined) {
       return this.name;
@@ -328,7 +335,7 @@ export function isQuickEvalCodelensEnabled() {
 /**
  * Enables canary features of this extension. Recommended for all internal users.
  */
-export const CANARY_FEATURES = new Setting('canary', ROOT_SETTING, true);
+export const CANARY_FEATURES = new Setting('canary', ROOT_SETTING);
 
 export function isCanary() {
   return !!CANARY_FEATURES.getValue<boolean>();
@@ -337,7 +344,7 @@ export function isCanary() {
 /**
  * Enables the experimental query server
  */
-export const CANARY_QUERY_SERVER = new Setting('canaryQueryServer', ROOT_SETTING, true);
+export const CANARY_QUERY_SERVER = new Setting('canaryQueryServer', ROOT_SETTING);
 
 
 export function allowCanaryQueryServer() {

extensions/ql-vscode/src/vscode-tests/test-config.ts

@@ -1,3 +1,5 @@
+import * as fs from 'fs-extra';
+import * as path from 'path';
 import { ConfigurationTarget } from 'vscode';
 import { ALL_SETTINGS, InspectionResult, Setting } from '../config';
 
@@ -59,12 +61,21 @@ class TestSetting<T> {
   }
 }
 
+// Public configuration keys are the ones defined in the package.json.
+// These keys are documented in the settings page. Other keys are
+// internal and not documented.
+const PKG_CONFIGURATION: Record<string, any> = (function initConfigurationKeys() {
+  // Note we are using synchronous file reads here. This is fine because
+  // we are in tests.
+  const pkg = JSON.parse(fs.readFileSync(path.join(__dirname, '../../package.json'), 'utf-8'));
+  return pkg.contributes.configuration.properties;
+}());
+
+
 // The test settings are all settings in ALL_SETTINGS which don't have any children
-// and are also not hiddent settings like the Canary setting.
+// and are also not hidden settings like the codeQL.canary.
 const TEST_SETTINGS = ALL_SETTINGS
-  .filter(setting => !setting.isHidden &&
-    ALL_SETTINGS.filter(s =>
-      s.parent === setting).length === 0)
+  .filter(setting => (setting.qualifiedName in PKG_CONFIGURATION) && !setting.hasChildren)
   .map(setting => new TestSetting(setting));
 
 export const getTestSetting = (setting: Setting): TestSetting<unknown> | undefined => {