remove acorn-bigint and acorn-dynamic-import devDenpendencies

[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:

Description

acorn built with bigint and dynamic import internal since 6.2.0 (while rollup depending on acorn ^6.2.1): https://github.com/acornjs/acorn/blob/master/acorn/CHANGELOG.md

(Note: don't update dependency acorn version to 7.0.0 for the moment, until most plugins compatible with that (at least waiting for acorn offcial stage3 plugins), and notice that import() has updated to ImportExpression in 7.0.0, which maybe need to update in rollup source.)

[LongTengDao]

@lukastaegert Could you figure out why the checks failed? If I missed something intricate, just treat this PR as an issue for refactor notice.

[lukastaegert]

The PR changes how the acorn import manifests in the ESM build. There is a special plugin that scans for how the import is written to rewrite it so that the ESM build can be reused properly by ESM aware bundlers. What needs to be done is basically to replace the generated default import (which comes from a poor CommonJS translation) with a namespace import. To that end, the two constants expectedAcornImport and newAcornImport need to be changed so that they line up with what can be found in the generated bundle.

[LongTengDao]

@lukastaegert Thanks for your explanation! I think I can't handle it. I will just leave this as an issue, waiting for someone else to do that.

[lukastaegert]

I fixed the import plugin but it appears dynamic imports are no longer recognized with these changes.

[lukastaegert]

Ok, seems they were lying about the minimum ECMA version, it needs to be 2020 (or 11) to work, not 10.

[codecov]

Codecov Report

Merging #3058 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3058      +/-   ##
==========================================
- Coverage   88.73%   88.73%   -0.01%     
==========================================
  Files         165      165              
  Lines        5735     5733       -2     
  Branches     1748     1748              
==========================================
- Hits         5089     5087       -2     
  Misses        388      388              
  Partials      258      258

Impacted Files	Coverage Δ
src/Module.ts	94.19% <ø> (ø)	⬆️
src/Graph.ts	92.98% <ø> (-0.09%)	⬇️

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[LongTengDao]

Oh, 11 is right. I will recorrect the changelog / doc / .d.ts of acorn.