Fixed source-map passed to istanbul-lib-instrument not being a plain object #10
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Hi,
I stumbled upon this issue while trying to instrument code previously compiled with svelte. The resulting source-map was an instance of
SourceMap, not a plain object. This led me to babel/babel#11614 and eventually to istanbuljs/istanbuljs#576 where it was stated thatistanbul-lib-instrumentexpects the source map to be a plain object - something which this plugin does not make sure of. This PR fixes that and makes the source-map always be a plain object.