It would be nice if tsup could pick up automatically the source files defined in the tsconfig.json.
Even if there are several ways in tsconfig.json for defining source files, there are all merged in the tsConfig.fileNames property after the parsing phase.
Today, to achieve this, I add a custom tsup.config.mjs to my projects. You can see it here:
https://github.com/fox1t/typescript-microservice-starter/blob/master/tsup.config.mjs#L10
The only drawback in shipping this in tsup directly is that typescript must be installed to parse the config file. However, we can mitigate it by adding a new flag to instruct tsup to pick entry from tsConfig.fileNames.
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