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Description of proposed changes
Configure ESLint to fail on any number of warnings. This better surfaces warnings on PR checks.
I considered putting this in the ESLint config file (.eslintrc.yaml), however it cannot be configured there and there are no plans to support that behavior¹.
¹ eslint/eslint#16804 (comment)
Related issue(s)
Closes #1839
Checklist
If making user-facing changes, add a message in CHANGELOG.md summarizing the changes in this PRN/A(to be done by a Nextstrain team member) Create preview PRs on downstream repositories.N/A