demo

This is a demo of the rollup sourcemap issue introduced in rollup babel plugin with inputSourceMap: true option.

for information about the option, please refer to https://babeljs.io/docs/options#inputsourcemap

Steps to reproduce

Build

pnpm -r build

Go to ./my-app/dist to find dist index.js

Then, use one of the following websites to open the index.js file:

• https://evanw.github.io/source-map-visualization/
• https://sokra.github.io/source-map-visualization/

You will see that the source code mapping is incorrect. Since

• Expected: babel transformed code ==sourcemap==> input code(in this case, js dist from foo package)
• Actual: babel transformed code ==sourcemap==> source code of input code(in this case, ts code from foo package), not input code itself

How to fix

Go to ./my-app/rollup.config.mjs and set inputSourceMap: false in the babel plugin options.