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It turns out to be a simple solution for me, but admittedly hard to figure out. The problem actually had to do with a require statement to load images in the code of the private package.
The function below was in the private package:
public static get(res: string) {
return require('@mycompany/ui-library/' + res)
}
Upon running vue-cli-service build or vue-cli-service serve, when Webpack sees this require statement, it apparently feels like it needs to parse/load ALL files, such as declaration files, source maps, readme, etc.
A simple solution was to change the code to explicitly list the file type in the require statement, which causes Webpack to only look for that specific file type:
public static getPNG(res: string) {
return require('@mycompany/ui-library/' + res + '.png')
}
There are also some ways to make a more flexible require statement, using Webpack’s require.context, to be able to specify a RegEx for the types of files you’d like to load.
Also, below are some related stories I finally found that talk about Webpack trying to load README files. Although, I think my Stackoverflow question will still be relevant as I found the issue in problems loading declaration and source map files.