async set(extensionName: string, key: string, value: unknown): Promise<void> {
    const data = this.loadData(extensionName);
    data[key] = value;
    this.saveData(extensionName, data);
}

async delete(extensionName: string, key: string): Promise<void> {
    const data = this.loadData(extensionName);
    delete data[key];
    this.saveData(extensionName, data);
}

async set(extensionName: string, key: string, value: unknown): Promise<void> {
    const data = this.loadData(extensionName);
    const updated = { ...data, [key]: value };
    this.saveData(extensionName, updated);
}

async delete(extensionName: string, key: string): Promise<void> {
    const data = this.loadData(extensionName);
    const { [key]: _, ...rest } = data;
    this.saveData(extensionName, rest);
}

private getFilePath(extensionName: string): string {
    return path.join(this.storageDir, `${extensionName}.json`);
}

import { isPathWithinDirectory } from './pathSafety';

private getFilePath(extensionName: string): string {
    const filePath = path.join(this.storageDir, `${extensionName}.json`);
    if (!isPathWithinDirectory(filePath, this.storageDir)) {
      throw new Error(`[ExtensionStorage] Invalid extension name: "${extensionName}"`);
    }
    return filePath;
}

} catch {
    // File doesn't exist or is corrupted — start fresh
    const empty: Record<string, unknown> = {};
    this.cache.set(extensionName, empty);
    return empty;
}

} catch (error) {
    // ENOENT is expected for new extensions; log corruption for debugging
    if (error instanceof Error && !error.message.includes('ENOENT')) {
      console.warn(`[ExtensionStorage] Corrupted data for "${extensionName}", starting fresh:`, error.message);
    }
    const empty: Record<string, unknown> = {};
    this.cache.set(extensionName, empty);
    return empty;
}