Use correct import.meta.url in config files

[lukastaegert]

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:
Resolves #3758

Description

This will make sure import.meta.url behaves as expected inside plugins that are imported via relative paths. Previously, import.meta.url would be the file url of the config file instead.

[rollup-bot]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#gh-3758_correct_config_import_meta

or load it into the REPL:
https://rollupjs.org/repl/?circleci=14634

[codecov]

Codecov Report

Merging #4005 (896a22e) into master (ff8067b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4005   +/-   ##
=======================================
  Coverage   97.24%   97.24%           
=======================================
  Files         192      192           
  Lines        6755     6759    +4     
  Branches     1971     1973    +2     
=======================================
+ Hits         6569     6573    +4     
  Misses         99       99           
  Partials       87       87           

Impacted Files	Coverage Δ
cli/run/loadConfigFile.ts	96.00% <100.00%> (+0.34%)	⬆️

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[ctjlewis]

Great work, Lukas! Sorry I was not more helpful on this issue.