What are some developer tools you wish existed?

A way to surface code quality -- across various metrics -- at any level of code (individual token, line of code, file, directory, package, library, application, ...).

Metrics could include: code style consistency, stability (has the area of code changed much over time), risk (is there potential for security vulnerabilities related to the code area), and test coverage.

The metrics - if displayed visually - might look something like a Heat Map[1], and would ideally be represented in the same place as the code itself, perhaps via background colours.

[1] - https://en.wikipedia.org/wiki/Heat_map

Something that could ingest an app's GUI code then render it as some accessible and editable... thing? So that users (and devs?) can easily produce mocks and proposed feature screenshots.

Like some sort of generic reverse wireframe sketcher.

A no-code/little code platform that is open-source, well designed, powerful but simple, and does the GUI as well.

Like Hasura but not only for the data, or Microsoft Access but without Microsoft or vba.

A heat-map of sorts for a codebase showing the files that have the most-frequent/most-recent edits as hottest. Purpose being to help acclimate new developers to a project by easily seeing which parts of the codebase are most actively worked on.

A tool to autogenerate sequence diagrams for when I'm working on a method or function

A machine that dispenses chocolate for every 100 lines of code I write.