Error TS1203: Export assignment cannot be used [for ESM]

[nalply]

Error summary
https://github.com/josdejong/mathjs/blob/develop/types/index.d.ts#L5 has an export assignment (export = math) but this seems not to be allowed for ECMAScript modules.

To Reproduce
Probably I am doing something shady, but I am trying to use mathjs for the browser without bundling. I symlinked dist/math.js to m.js and types/index.d.ts to m.d.ts in my ts source directory. I tried many other things to avoid bundling during development but kept failing, and I thought, perhaps I use the pre-bundled dist/math.js instead, but this also fails already when compiling TS.

I am willing to edit types/index.d.ts to fix this problem but need to understand a little better how mathjs is structured. For example, why export assignment? And how is MathJsStatic related to the default export math?

[josdejong]

Thanks for your input Danial. I think this is a duplicate of #2919, please continue the discussion there.