What does the Node.js `--nolazy` flag mean?

Question

When I use --nolazy, I can finally debug asynchronously with IntelliJ, as breakpoints stop at the correct place. But I can\'t find any docs on --nolazy

Answer 1

refer to: https://vscode-docs.readthedocs.io/en/stable/editor/debugging/

For performance reasons Node.js parses the functions inside JavaScript files lazily on first access. As a consequence, breakpoints don't work in source code areas that haven't been seen (parsed) by Node.js.

Since this behavior is not ideal for debugging, VS Code passes the --nolazy option to Node.js automatically. This prevents the delayed parsing and ensures that breakpoints can be validated before running the code (so they no longer "jump").

Since the --nolazy option might increase the start-up time of the debug target significantly, you can easily opt out by passing a --lazy as a runtimeArgs attribute.