prepareContent should generate source maps #270
Description
Is your feature request related to a problem? Please describe.
prepareContent is used to strip indentation and prepend some data to any file. Would be a nice addition to generate a source map of the changes so we can have errors with correct line/columns.
Describe the solution you'd like
Possibly use magic-string, which is already a svelte dependency to generate the map.
Describe alternatives you've considered
🤷
How important is this feature to you?
Would improve the DX for the rest of the language-tools.