Use correct file names when writing sourcemaps for multiple outputs using the "dir" option #3440
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Resolves #3439
Description
The issue was that Rollup mutates the generated chunk objects when writing multiple outputs, overwriting the chunk ids in the process. When using a config file, writing multiple outputs is interleaved. As the sourcemapfile is using the chunk id and is generated at the end, an overwritten chunk id is used. This is fixed for now by storing the chunk id in a local variable.