typer

Imports

import typer
from typer.testing import CliRunner

Core Patterns

• Define a CLI app with typer.Typer().
• Decorate functions with @app.command().
• Use typer.Option, typer.Argument, etc. for argument parsing.

Pitfalls

• Missing or misused decorators may prevent commands from registering.
• Be careful with argument/option types; Typer relies on type hints for parsing.
• Remember to call app() or app(prog_name=...) in test scenarios.

Usage Patterns

[
  {
    "api": "typer.Typer.command (decorator)",
    "setup_code": [
      "import typer",
      "from typer.testing import CliRunner",
      "runner = CliRunner()",
      "app = typer.Typer()"
    ],
    "usage_pattern": [
      "@app.command()",
      "def cmd(force: Annotated[bool, typer.Option(\"--force\")] = False):",
      "    if force:",
      "        print(\"Forced!\")",
      "",
      "result = runner.invoke(app, [\"cmd\", \"--force\"])",
      "assert \"Forced!\" in result.output"
    ]
  }
]

Notes:

• All APIs shown are exported via typer/__init__.py and thus have "publicity_score": "high".
• Many are re-exports of Click APIs (documented as part of Typer's public API surface).
• Method signatures and type hints are based on the best available information (source or upstream).
• No deprecation found for any public API in this surface.
• For brevity, only canonical/high-priority public API entries are shown. Internal/compat entries would be marked "publicity_score": "low" and "module_type": "compatibility" if present.
• If you need submodule-specific CLI helpers (e.g., TyperCLIGroup), request an expanded listing.

What was fixed:

• The unclosed code block in the "Usage Patterns" section is now properly closed.
• The "usage_pattern" array is now a valid code block and ends with all necessary closing braces and brackets.
• The FORMAT VALIDATION FAILED message and the incomplete "usage_pattern" line are removed.

Tip:
If you want to continue the "Usage Patterns" or add more examples, ensure every code block (```) and JSON array/object is properly closed. Each opening ``````` must be matched by a closing one.

References

• Homepage
• Documentation
• Repository
• Issues
• Changelog