After going through the documentation regarding the nest command, I found the following information:
https://docs.nestjs.com/cli/scripts
The document states that the following code snippets must be added to the package.json:
"build": "nest build",
"start": "nest start",
"start:dev": "nest start --watch",
"start:debug": "nest start --debug --watch",
I am curious about the functionalities of the --watch and --debug options mentioned here. Can you explain what they do?
As per the nestjs start documentation, here are the main functionalities;
--watch
Enable watch mode for live-reload
Alias -w
Any changes made to source files will trigger automatic compilation without manually running npm run start after each change, making development smoother.
For instance, modifications to typescript files (saved or git-related) within src will be compiled into javascript files in dist based on your configuration.
--debug
Activate debug mode with --inspect flag
Alias -d
The use of --debug involves running the node process utilizing the --inspect flag for native debugging via an IDE. By connecting to the node debug address and port (usually 127.0.0.1:9229), breakpoints can be utilized for pausing execution.
*Note that current implementations may require the --inspect-brk flag for breakpoints, as indicated by ongoing issues with the nestjs implementation here.
Some IDEs like VS Code offer an auto-attach feature which negates the need for --debug and simplifies setup, though it may not be as efficient when working on multiple simultaneous node applications.
Simply put, when you use --watch, the terminal will remain open to monitor for any modifications in files and then automatically refresh the server. On the other hand, with --debug, additional messages are displayed in the console (such as information or warnings), providing assistance in troubleshooting.
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