refactor: Allow optional methods for languages #18604
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Prerequisites checklist
What is the purpose of this pull request? (put an "X" next to an item)
[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[x] Add something to the core
[ ] Other, please explain:
What changes did you make? (Give an overview)
Updated
linter.jsto optionally call some of the methods on language objects andSourceCode.In investigating writing the JSON plugin, I discovered that a lot of the methods were not necessary for linting JSON (at least, not as a first attempt). This PR checks for the existence of various methods before calling them, allowing language plugin authors to skip implementing a bunch of methods that do nothing.
refs #16999
Is there anything you'd like reviewers to focus on?