Desktop Commander MCP

import { configManager } from '../config-manager.js'; import { featureFlagManager } from './feature-flags.js'; /** * A/B Test controlled feature flags * * Experiments are defined in remote feature flags JSON: * { * "flags": { * "experiments": { * "OnboardingPreTool": { * "variants": ["noOnboardingPage", "showOnboardingPage"] * } * } * } * } * * Usage: * if (await hasFeature('showOnboardingPage')) { ... } */ interface Experiment { variants: string[]; } // Cache for variant assignments (loaded once per session) const variantCache: Record<string, string> = {}; /** * Get experiments config from feature flags */ function getExperiments(): Record<string, Experiment> { return featureFlagManager.get('experiments', {}); } /** * Get user's variant for an experiment (cached, deterministic) */ async function getVariant(experimentName: string): Promise<string | null> { const experiments = getExperiments(); const experiment = experiments[experimentName]; if (!experiment?.variants?.length) return null; // Check cache if (variantCache[experimentName]) { return variantCache[experimentName]; } // Check persisted assignment const configKey = `abTest_${experimentName}`; const existing = await configManager.getValue(configKey); if (existing && experiment.variants.includes(existing)) { variantCache[experimentName] = existing; return existing; } // New assignment based on clientId const clientId = await configManager.getValue('clientId') || ''; const hash = hashCode(clientId + experimentName); const variantIndex = hash % experiment.variants.length; const variant = experiment.variants[variantIndex]; await configManager.setValue(configKey, variant); variantCache[experimentName] = variant; return variant; } /** * Check if a feature (variant name) is enabled for current user */ export async function hasFeature(featureName: string): Promise<boolean> { const experiments = getExperiments(); if (!experiments || typeof experiments !== 'object') return false; for (const [expName, experiment] of Object.entries(experiments)) { if (experiment?.variants?.includes(featureName)) { const variant = await getVariant(expName); return variant === featureName; } } return false; } /** * Get all A/B test assignments for analytics (reads from config) */ export async function getABTestAssignments(): Promise<Record<string, string>> { const experiments = getExperiments(); const assignments: Record<string, string> = {}; for (const expName of Object.keys(experiments)) { const configKey = `abTest_${expName}`; const variant = await configManager.getValue(configKey); if (variant) { assignments[`ab_${expName}`] = variant; } } return assignments; } function hashCode(str: string): number { let hash = 0; for (let i = 0; i < str.length; i++) { hash = ((hash << 5) - hash) + str.charCodeAt(i); hash |= 0; } return Math.abs(hash); }