We've had issues with example code in README.md files for our packages becoming very stale (e.g., never being updated after NNBD migration, and thus not even compiling). pub.dev has an "Example" tab that shows the main code from the example/ directory, but that's often a lot of code, especially since we use it for integration tests.

We can use
https://github.com/chalin/code_excerpter
https://github.com/chalin/code_excerpt_updater
(used by other Flutter repositories) to extract sections from our examples into the READMEs. To ensure that they stay up to date, we would need to add a command to the repo tool similar to format, which would run generation and ensure that nothing has changed, and if it has dumping a diff to the console for ease of updating.