Avoid generate .* thing

[LongTengDao]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers: #3023

Description

import * as x from 'x';
export { x as default };

Avoid source above generate below thing:

var x = require('x');
module.exports = x.*;

[codecov]

Codecov Report

Merging #3034 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #3034   +/-   ##
=======================================
  Coverage   88.65%   88.65%           
=======================================
  Files         165      165           
  Lines        5694     5694           
  Branches     1738     1738           
=======================================
  Hits         5048     5048           
  Misses        388      388           
  Partials      258      258

Impacted Files	Coverage Δ
src/finalisers/shared/getExportBlock.ts	87.71% <100%> (ø)	⬆️

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[lukastaegert]

Very nice 👍

[LongTengDao]

@lukastaegert With your help, I feel more and more familiar with rollup!