Allow import.meta.* for systemjs format

[dmail]

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: #3151

Description

This PR mark module global variable as referenced for any property of import.meta, not only for import.meta.url.
I have focused on systemjs format because I don't really know what to do with other formats.

[codecov]

Codecov Report

Merging #3152 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3152      +/-   ##
==========================================
- Coverage   90.12%   90.12%   -0.01%     
==========================================
  Files         165      165              
  Lines        5874     5873       -1     
  Branches     1790     1789       -1     
==========================================
- Hits         5294     5293       -1     
  Misses        350      350              
  Partials      230      230

Impacted Files	Coverage Δ
src/ast/nodes/MetaProperty.ts	100% <100%> (ø)	⬆️

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[lukastaegert]

Thanks! I see your point, there probably is no "natural" choice for any format besides esm and SystemJS. I hope to have a look soon. The undefined is not really a result of your fix but have been there all along: https://rollupjs.org/repl/?version=1.23.1&shareable=JTdCJTIybW9kdWxlcyUyMiUzQSU1QiU3QiUyMm5hbWUlMjIlM0ElMjJtYWluLmpzJTIyJTJDJTIyY29kZSUyMiUzQSUyMmNvbnNvbGUubG9nKGltcG9ydC5tZXRhLnJlc29sdmUoKSklM0IlMjIlMkMlMjJpc0VudHJ5JTIyJTNBdHJ1ZSU3RCU1RCUyQyUyMm9wdGlvbnMlMjIlM0ElN0IlMjJmb3JtYXQlMjIlM0ElMjJjanMlMjIlMkMlMjJuYW1lJTIyJTNBJTIybXlCdW5kbGUlMjIlMkMlMjJhbWQlMjIlM0ElN0IlMjJpZCUyMiUzQSUyMiUyMiU3RCUyQyUyMmdsb2JhbHMlMjIlM0ElN0IlN0QlN0QlMkMlMjJleGFtcGxlJTIyJTNBbnVsbCU3RA==

The reason is this:

rollup/src/utils/defaultPlugin.ts

Line 86 in 53266e6

return prop === null ? `({ url: ${urlMechanism} })` : prop === 'url' ? urlMechanism : 'undefined';

On second thought, I believe it makes sense to do it that way. As for these formats, we do not know where to look for these properties, we assume them to be undefined. This will throw an error if they are actually accessed but will otherwise produce valid code if not.