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For something that simple, I would agree, but the demo is barely scratching the surface. I'd like to make a more in-depth version showing a more complicated transform, such as changing a function signature and having it update the callers across multiple files.

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Yeah, maybe some other example would be more convincing. I think this case would still be a good job for search and replace, you'll need to investigate the surrounding code to get the new data to pass to the function or modify the existing data to support the new format. It's unlikely that you add or remove an argument from a function and nothing else needs to change.

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