Lightweight GitHub MCP

import { readFileSync, existsSync } from "fs"; import { parse } from "yaml"; import { fileURLToPath } from "url"; import { dirname, join } from "path"; import type { Config } from "./types.js"; const __filename = fileURLToPath(import.meta.url); const __dirname = dirname(__filename); function findConfigFile(): string { // 1. Environment variable if (process.env.CONFIG_PATH) { if (existsSync(process.env.CONFIG_PATH)) { return process.env.CONFIG_PATH; } throw new Error(`Config file not found at CONFIG_PATH: ${process.env.CONFIG_PATH}`); } // 2. Current directory const cwdConfig = join(process.cwd(), "config.yaml"); if (existsSync(cwdConfig)) { return cwdConfig; } // 3. Project root (relative to dist/config.ts -> ../) const projectRoot = join(__dirname, "..", "config.yaml"); if (existsSync(projectRoot)) { return projectRoot; } // 4. Try one more level up (in case running from dist/) const parentRoot = join(__dirname, "..", "..", "config.yaml"); if (existsSync(parentRoot)) { return parentRoot; } throw new Error( "Config file not found. Please create config.yaml in the current directory or set CONFIG_PATH environment variable." ); } export function loadConfig(): Config { const configPath = findConfigFile(); let content: string; try { content = readFileSync(configPath, "utf-8"); } catch (error) { throw new Error(`Failed to read config file: ${configPath}`); } let config: Config; try { config = parse(content) as Config; } catch (error) { throw new Error(`Failed to parse config file: ${error}`); } // Validation if (!config.allowedTools || !Array.isArray(config.allowedTools)) { throw new Error("Config error: 'allowedTools' must be an array"); } if (config.allowedTools.length === 0) { throw new Error("Config error: 'allowedTools' must not be empty"); } if (!config.upstream) { throw new Error("Config error: 'upstream' configuration is required"); } if (!config.upstream.command) { throw new Error("Config error: 'upstream.command' is required"); } if (!config.upstream.args || !Array.isArray(config.upstream.args)) { throw new Error("Config error: 'upstream.args' must be an array"); } return config; }