[Feature Request] ensure consistent output structure of input modules while using preserveModules

[davidroeca]

Feature Use Case

While using preserveModules in combination with plugins such as @rollup/plugin-node-resolve and @rollup/plugin-commonjs, the directory structure of an input module may change based on related modules that get bundled alongside the input module.

Note the odd behavior here: https://github.com/davidroeca/rollup-preserveModules-dir-issue

Feature Proposal

One or more of the following:

• Provide users a way to restructure/rename output directories as outlined in Why does the preserveModules option generate node_modules folder #3684
• Let users specify a moduleRootDir that should be mirrored in the output dir while using preserveModules. In other words, if the input is src/index.js and the output dir is dist/ and moduleRootDir is src/, then the module src/module.js should be placed in dist/module.js.

[davidroeca]

Closed via #3786