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Re:NPM – "is-even", 160k weekly downloads by acemarke on Tuesday November 16, 2021 @04:09PM (#29246384)
For built-in syntax parsing, yes - those official plugins just told the parser to enable those specific bits of syntax.

Actual plugins for non-standard syntax were all real AST visitor-based modifications, though.

Re:NPM – "is-even", 160k weekly downloads by mintplant on Wednesday November 17, 2021 @08:05PM (#29260947)
I found this out some years ago while investigating how I might write my own Babel plugin for some non-standard syntax. At the time there were no such facilities available, only the hidden built-in parser flags.