fix(cli): add explicit Node 18+ version check with helpful error

Nikolay Samokhvalovrequested to merge
fix/node18-requirement into main

Summary

Add runtime version check that provides a clear, actionable error message when running on Node.js < 18.

Changes

  • Add version check at CLI startup
  • Show clear error with EOL dates and upgrade instructions
  • Exit gracefully instead of cryptic syntax errors

Why Node 18+ is required

  • Node.js 14 reached end-of-life in April 2023
  • Node.js 16 reached end-of-life in September 2023
  • Supporting EOL versions creates security liability
  • Node 18 was released in April 2022 — it's been available for almost 4 years
  • Users should upgrade to Node 20 LTS or Node 22 for security updates

Error message example 

Error: postgresai requires Node 18 or higher.
You are running Node.js 14.21.3.

Please upgrade to Node.js 20 LTS or Node.js 22 for security updates.

Download: https://nodejs.org/

Closes #112 (closed)

Edited by Nikolay Samokhvalov

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