Figma to Flutter MCP Server

// utils/retry.mts import {FigmaError, FigmaRateLimitError, FigmaNetworkError} from '../types/errors.js'; export interface RetryOptions { maxAttempts?: number; initialDelayMs?: number; maxDelayMs?: number; backoffMultiplier?: number; retryableErrors?: (error: Error) => boolean; } export interface RetryState { attempt: number; totalElapsed: number; lastError?: Error; } const DEFAULT_OPTIONS: Required<RetryOptions> = { maxAttempts: 3, initialDelayMs: 1000, maxDelayMs: 30000, backoffMultiplier: 2, retryableErrors: (error: Error): boolean => { // Retry on network errors and rate limits, but not auth or parse errors return (error instanceof FigmaNetworkError) || (error instanceof FigmaRateLimitError) || (error instanceof FigmaError && error.statusCode && error.statusCode >= 500) || false; } }; export async function withRetry<T>( operation: () => Promise<T>, options: RetryOptions = {} ): Promise<T> { const opts = {...DEFAULT_OPTIONS, ...options}; let lastError: Error; for (let attempt = 1; attempt <= opts.maxAttempts; attempt++) { try { return await operation(); } catch (error) { lastError = error as Error; // Don't retry if this is the last attempt if (attempt === opts.maxAttempts) { break; } // Don't retry if error is not retryable if (!opts.retryableErrors(lastError)) { break; } // Calculate delay let delay = opts.initialDelayMs * Math.pow(opts.backoffMultiplier, attempt - 1); // Handle rate limit specific delay if (lastError instanceof FigmaRateLimitError && lastError.retryAfter) { delay = lastError.retryAfter * 1000; // Convert to ms } // Cap the delay delay = Math.min(delay, opts.maxDelayMs); console.log(`Attempt ${attempt} failed: ${lastError.message}. Retrying in ${delay}ms...`); await sleep(delay); } } throw lastError!; } function sleep(ms: number): Promise<void> { return new Promise(resolve => setTimeout(resolve, ms)); } // Helper function for logging retry state export function logRetryAttempt(state: RetryState, error: Error): void { console.warn(`Retry attempt ${state.attempt} failed after ${state.totalElapsed}ms: ${error.message}`); }