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fastapi / typer

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Code

How fastapi/typer is laid out, and where to start for common changes.

There is no import map for this report yet.

Where to start reading

  1. Repository root
  2. Repository root
  3. Likely public API
  4. Likely start-up file
  5. Likely start-up file
  6. Suggested starting pointAI
  7. Suggested starting pointAI
  8. Suggested starting pointAI

Find files for a task

AI

Add a new CLI command

  • Create a new Python file in `docs_src/commands/` with a function decorated with `@app.command()`.
  • Register the command with the main Typer app instance via `typer.run()` or explicit command registration.

Add environment variable support to a parameter

  • Import `typer.Option` or `typer.Argument` and use the `envvar` parameter.
  • Declare parameter with type hint and wrap default value in `typer.Option(..., envvar="ENV_VAR_NAME")`.

Add custom help text and parameter documentation

  • Use the `help` parameter in `typer.Option()` or `typer.Argument()` to set parameter-level documentation.
  • Add docstring to the command function for command-level help text.
  • Use Rich markdown formatting in help strings for enhanced terminal rendering.

Implement command-level validation or setup with callbacks

  • Create a callback function decorated with `@app.callback()` to run before command execution.
  • Use the callback context to share state or perform global setup across commands.

Change the public API

Trace runtime behavior

Add or update tests

Change build or automation

RepoPilot lists up to 500 files, so a file missing here may still exist.

  • Files marked “likely” are guessed from their names.
  • The file list is newer than the written guide, so descriptions and suggested changes may describe older code.

Code quality and hotspots

Largest source files

  • Branch points23 per file on average
  • Code issues0 errors, 31 warnings
  • Largest file2,023 lines
  • Hotspot load0 high-risk files

Static checks on the 15 largest source files.

Tests, CI and tooling

  • CIGitHub Actions16 workflows
  • Tests306 test filesPytest · 0.91 test files per source file (file count, not coverage)
  • Dependency updatesDependabot

Test folders: tests/assets/cli · tests/assets · tests

Hotspots

Files that change often and branch heavily, highest first. Branch points count if, loop, case, catch, ternary, && and || in the file.