Create sourcemaps for the relay plugin transformation #459
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This PR fixes broken sourcemaps when using this plugin. The issue is, that the transfomations made by the
babel-plugin-relay
transformation will not be tracked by vite if we returnnull
for the source maps. Vite therefore treats the transformations made by this plugin as a noop from a sourcemap perspective. Since the plugin introduces several whitespaces, sourcemaps are practically unusable.