Bucket Feature Flags MCP Server

import { ExitPromptError } from "@inquirer/core"; import { ErrorObject } from "ajv"; import chalk from "chalk"; export class MissingAppIdError extends Error { constructor() { super( "App ID is required. Please provide it with --appId or in the config file. Use `reflag apps list` to see available apps.", ); this.name = "MissingAppIdError"; } } export class MissingEnvIdError extends Error { constructor() { super("Environment ID is required."); this.name = "MissingEnvIdError"; } } export class ConfigValidationError extends Error { constructor(errors?: ErrorObject[] | null) { const messages = errors ?.map((e) => { const path = e.instancePath || "config"; const value = e.params?.allowedValues ? `: ${e.params.allowedValues.join(", ")}` : ""; return `${path}: ${e.message}${value}`; }) .join("\n"); super(messages); this.name = "ConfigValidationError"; } } type ResponseErrorData = { error?: { message?: string; code?: string; }; validationErrors?: { path: string[]; message: string }[]; }; export class ResponseError extends Error { public readonly data: ResponseErrorData; constructor(response: ResponseErrorData) { super(response.error?.message ?? response.error?.code); this.data = response; this.name = "ResponseError"; } } export function handleError(error: unknown, tag: string): never { tag = chalk.bold(`\n[${tag}] error:`); if (error instanceof ExitPromptError) { process.exit(0); } else if (error instanceof ResponseError) { console.error( chalk.red(tag, error.data.error?.message ?? error.data.error?.code), ); if (error.data.validationErrors) { console.table( error.data.validationErrors.map( ({ path, message }: { path: string[]; message: string }) => ({ path: path.join("."), error: message, }), ), ); } } else if (error instanceof Error) { console.error(chalk.red(tag, error.message)); if (error.cause) { console.error(error.cause); } } else if (typeof error === "string") { console.error(chalk.red(tag, error)); } else { console.error(chalk.red(tag ?? "An unknown error occurred:", error)); } process.exit(1); }