When i run npm run build i am getting the Error
Sateesh Kumar
3

it looks like you didn’t provide default export in rollup.config.umd.js . can you check that in that file?

rollup.config.umd.js (excerpt)

...
export default {
entry: PATH_SRC+nameLibrary+'.ts',
format: 'umd',
moduleName: nameLibrary,
...
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