I am looking for some method which can convert pre built Aura components to LWC open source.
is there any tool or simple convert method exist?
I wish I don't have to do it one by one.
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This documentation would be the best bet in terms of understanding how to migrate aura components into Lightning web components. Not to mention, that site contains great documentation on learning about Lightning web components in general which you'll need as you work with them.
I recently built a tool to do this:
There are still many bugs, but at the same time it does provide some of the necessary features. It can be performed in two ways: