fix(cli): show friendly error when Node < 20 on startup#41
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Summary
Adds a Node.js version check at CLI startup. When the running Node.js version is below v20, the CLI prints a friendly error message with the detected version, required version, and a link to download Node.js — instead of crashing with a cryptic error.
Related
Closes #23
Testing
Added Vitest unit tests covering both paths:
Tests couldn't be run locally due to missing
node_modulesin the sandbox. The test file is atpackages/cli/src/check-version.test.ts.Changes
checkNodeVersion()function inpackages/cli/src/index.tsmain()before any other logic