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env.ts2.64 kB
import yargs from 'yargs'; import { hideBin } from 'yargs/helpers'; import { z } from 'zod'; import { EnvironmentValidationError } from '../errors/environment-validation-error.js'; // Define the environment schema with zod export const envSchema = z.object({ API_TOKEN: z.string().min(1, 'API Token is required').optional(), POSTGRES_CONNECTION_STRING: z.string().min(1, 'Postgres connection string is required'), // Server configuration options RUN_SSE: z.boolean().optional().default(false), PORT: z.number().int().positive().optional().default(3000), }); // Export the type derived from the schema export type Env = z.infer<typeof envSchema>; /** * Loads environment variables from command line arguments and env vars. * Run with: npx mcp-postgres --token=YOUR_TOKEN --connection-string=YOUR_CONNECTION_STRING --run-sse --port=4000 * Or set environment variables API_TOKEN, POSTGRES_CONNECTION_STRING, RUN_SSE, PORT * * @returns {Env} Validated environment configuration * @throws {EnvironmentValidationError} When environment validation fails */ export function loadEnv(): Env { // Command line parsing with yargs - use parseSync for synchronous parsing const argv = yargs(hideBin(process.argv)) .option('token', { alias: 't', description: 'API Token', type: 'string', }) .option('connection-string', { alias: 'c', description: 'Postgres connection string', type: 'string', }) .option('run-sse', { alias: 's', description: 'Run server with SSE transport', type: 'boolean', }) .option('port', { alias: 'p', description: 'Port for HTTP server (when using SSE)', type: 'number', }) .help() .parseSync(); // Priority: command line args > environment variables const envData = { API_TOKEN: argv.token || process.env.API_TOKEN, POSTGRES_CONNECTION_STRING: argv.connectionString || process.env.POSTGRES_CONNECTION_STRING, RUN_SSE: argv.runSse || process.env.RUN_SSE === 'true', PORT: argv.port || (process.env.PORT ? parseInt(process.env.PORT, 10) : undefined), }; try { return envSchema.parse(envData); } catch (error) { if (error instanceof z.ZodError) { const errorMessages = error.errors.map((err) => `${err.path.join('.')}: ${err.message}`).join('\n'); throw new EnvironmentValidationError(`Environment validation failed:\n${errorMessages}`); } throw error; } }

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