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refactor: use fast-xml-parser to parse and build XML #234

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@nyarthan nyarthan commented Jun 30, 2025

jsdom is quite a heavy library just to parse some XML content. (2.7MB minified) This replaces it with the parser of fast-xml-parser.

Since the result is a plain JS Object instead of a DOM node, we can also use the corresponding XMLBuilder.

The resulting XML is formatted differently (no empty lines between sibling tags), hence the failing tests. Since the previous solution also did not preserve formatting I think this is a reasonable side-effect. But I'm curious how this should be handled.

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