Bug#942045: rollup 0.68.2 transition: build fails with TypeError: magic_string_1.SourceMap is not a constructor

[Pirate Praveen]

Control: reassign -1 node-magic-string

I think this comes from the inconsistent exports in es.js and cjs.js

es.js has this line at the end,

export { Bundle, SourceMap };

but cjs.js or umd.js does not export these.