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Category 1 can be further subdivided into

1.1. Languages where people have written full parsers and analysers in Emacs Lisp.

1.2. Languages where the Emacs support relies on external programs to provide intelligence.

Only very few languages (e.g. JavaScript) fall in subcategory 1.1.

Unfortunately, js2-mode's parser isn't updated to keep pace with modern language development. I've had much better results over the last year with an LSP integration, and rarely if ever go back to js2-mode these days.

Similarly, while js2-mode's built-in formatter is quite good, Prettier is both more (and more easily) configurable and more shareable - it can enforce an agreed-upon style at the codebase level without any editor-specific tooling or configuration, and the consequent absence of bikeshedding is welcome.

Yeah LSP is taking over. I don't think category 1.1 is going to last.

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