config - add method to get known configuration keys

src/vs/platform/configuration/common/model.ts

@@ -175,4 +175,17 @@ export function flatten(contents: any): any {
 	}
 
 	return root;
+}
+
+export function getConfigurationKeys(): string[] {
+	const keys: string[] = [];
+
+	const configurations = Registry.as<IConfigurationRegistry>(Extensions.Configuration).getConfigurations();
+	configurations.forEach(config => {
+		if (config.properties) {
+			keys.push(...Object.keys(config.properties));
+		}
+	});
+
+	return keys;
 }
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