usethis::use_coverage()

[hadley]

This is the standard codecov.yml that we use; but don't ask me to explain because I've forgotten why we chose these values.

[MichaelChirico]

LGTM. Pasting the definitions for posterity:

• target - auto will use the coverage from the base commit (pull request base or parent commit) coverage to compare against.
• threshold [number] - Allow the coverage to drop by X%, and posting a success status.
• informational - Use Codecov in informational mode. Default is false. If true is specified the resulting status will pass no matter what the coverage is or what other settings are specified. Informational mode is great to use if you want to expose codecov information to other developers in your pull request without necessarily gating PRs on that information.

https://docs.codecov.com/docs/commit-status

I might shut off informational but merging for now